Diabetes & Metabolism Journal

Original Article

Basic and Translational Research
PUM2 Lowers HDAC9 mRNA Stability to Improve Contrast-Induced Acute Kidney Injury through Attenuating Oxidative Stress and Promoting Autophagy: Wei Chen, Hengcheng Lu, Wenni Dai, Hao Li, Yinyin Chen, Guoyong Liu, Liyu He; Received July 18, 2024 Accepted May 21, 2025 Published online September 10, 2025; DOI: https://doi.org/10.4093/dmj.2024.0396 [Epub ahead of print]

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Background
Contrast-induced acute kidney injury (CIAKI) is the third cause of hospital-acquired acute kidney injury and diabetes mellitus (DM) was identified as a risk factor for CIAKI. However, the molecular mechanism underlying DM-CIAKI remains unclear, which needs further investigation.
Methods
DM-CIAKI models of mice and cells were established. The functions of kidneys were evaluated by detecting indicators and using hematoxylin and eosin staining. The abundance of genes and proteins was evaluated by real-time quantitative reverse transcription polymerase chain reaction, immunohistochemistry, immunofluorescence, and Western blot. Glutathione peroxidase, superoxide dismutase, and malondialdehyde were measured using commercial kits and reactive oxygen species was detected using dihydroethidium (DHE) probe and 2ʹ,7ʹ-dichloroflfluorescein diacetate (DCFH-DA) method. Apoptosis of tissues and cells was evaluated by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL). Cell viability and proliferation were measured using Cell Counting Kit-8 and 5-ethynyl-2ʹ-deoxyuridine (EdU) assay. The interaction between pumilio RNA binding family member 2 (PUM2) and histone deacetylase 9 (HDAC9) was validated using RNA immunoprecipitation (RIP) and RNA pull-down.
Results
PUM2 expression was observably reduced in DM-CIAKI models while HDAC9 expression was notably boosted. Subsequently, PUM2 silencing resulted in aggravation of kidney injury in DM-CIAKI mice through enhancing oxidative stress and suppressing autophagy, while HDAC9 inhibitor or HDAC9 silencing achieved the opposite results. In terms of mechanism, PUM2 could suppress stability of HDAC9 mRNA to attenuate HDAC9 expression. Furthermore, HDAC9 overexpression abolished PUM2 overexpression-mediated oxidative stress inhibition and autophagy promotion in high glucose and contrast media treatments-induced human kidney-2 (HK-2) cells.
Conclusion
PUM2 overexpression suppressed oxidative stress and promoted autophagy to alleviate renal injury in DM-CIAKI through interacting with HDAC9 mRNA, which mediated degradation of HDAC9 mRNA and inhibition of HDAC9 expression.

Citations

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Purpurin Rescues Contrast-Induced Acute Rat Kidney Injury via Inducing Autophagy and Inhibiting Apoptosis
Kangxu He, Xiaoying Sun, Xinhui Pan, Xiaoda Yang, Qi Wang, Kai Liao
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Rubia cordifolia L. Dichloromethane Extract Ameliorates Contrast-Induced Acute Kidney Injury by Activating Autophagy via the LC3B/p62 Axis
Xiaoying Sun, Kangxu He, Guanzhong Chen, Xiaoda Yang, Xinhui Pan, Kai Liao
Molecules.2026; 31(2): 316. CrossRef

Sulwon Lecture 2024

Basic and Translational Research
Overcoming β-Cell Dysfunction in Type 2 Diabetes Mellitus: CD36 Inhibition and Antioxidant System: Il Rae Park, Yong Geun Chung, Kyu Chang Won; Diabetes Metab J. 2025;49(1):1-12. Published online January 1, 2025; DOI: https://doi.org/10.4093/dmj.2024.0796

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Type 2 diabetes mellitus (T2DM) is marked by chronic hyperglycemia, gradually worsening β-cell failure, and insulin resistance. Glucotoxicity and oxidative stress cause β-cell failure by increasing reactive oxygen species (ROS) production, impairing insulin secretion, and disrupting transcription factors such as pancreatic and duodenal homeobox 1 (PDX-1) and musculoaponeurotic fibrosarcoma oncogene family A (MafA). Cluster determinant 36 (CD36), an essential glycoprotein responsible for fatty acid uptake, exacerbates oxidative stress and induces the apoptosis of β-cells under hyperglycemic conditions through pathways involving ceramide, thioredoxin-interacting protein (TXNIP), and Rac1-nicotinamide adenine dinucleotide phosphate oxidase (NOX)-mediated redoxosome formation. Targeting CD36 pathways has emerged as a promising therapeutic strategy. Oral hypoglycemic agents, such as metformin, teneligliptin, and pioglitazone, have shown protective effects on β-cells by enhancing antioxidant defenses. These agents reduce glucotoxicity via mechanisms such as suppressing CD36 expression and stabilizing mitochondrial function. Additionally, novel insights into the glutathione antioxidant system and its role in β-cell survival underscore its therapeutic potential. This review focuses on the key contribution of oxidative stress and CD36 to β-cell impairment, the therapeutic promise of antioxidants, and the need for further research to apply these findings in clinical practice. Promising strategies targeting these mechanisms may help preserve β-cell function and slow T2DM progression.

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Carlos Cruz‐Cortés, Silvia Micháliková, Petronela Rezbáriková, L. Michel Espinoza‐Fonseca, Jana Viskupičová
ChemMedChem.2026;[Epub] CrossRef
Bone Marrow Mesenchymal Stromal Cells and Their Derived Extracellular Vesicles Protect Pancreatic Beta‐TC‐6 Cells From Hypoxia‐Induced Injury via miR‐539‐3p‐Mediated Downregulation of CD36 Expression
Na Lin, Yaoyao Liang, Minying Tang, Fei Liu, Liuyan Chen, Lvying Wu, Yunfeng Fu, Zhuoyu Li, Lingfeng Zhu, Jin Chen, Yuelin Zhang
Stem Cells International.2026;[Epub] CrossRef
Polygonatum sibiricum polysaccharides enhance pancreatic β-cell function in diabetic zebrafish by mitigating mitochondrial oxidative damage via the AMPK-SIRT1 pathway
Fan Lin, Wenjing Yu, Ping Li, Shuyao Tang, Yitong Ouyang, Liya Huang, Di Wu, Shaowu Cheng, Zhenyan Song
Frontiers in Nutrition.2025;[Epub] CrossRef
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International Journal of Molecular Sciences.2025; 26(10): 4652. CrossRef
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Hongmei Yu, Jie Liu, Xiaojuan He
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Tomasz Szkudelski, Katarzyna Szkudelska, Aleksandra Łangowska
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Natalia Reyes-Vallejo, Miguel Valdes, Adelfo Reyes-Ramírez, Juan Andres Alvarado-Salazar, Alejandro Cruz, Erik Andrade-Jorge, Jessica Elena Mendieta-Wejebe
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Muhammad Saqib Saif, Sana Batool, Yusra Majeed, Asadullah, Tuba Tariq, Li Haitao, Yanjun Duan, Ghazala Mustafa, Murtaza Hasan
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Ancuța Dinu (Iacob), Luminita-Georgeta Confederat, Ionut Dragostin, Ionela Daniela Morariu, Dana Tutunaru, Oana-Maria Dragostin
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Original Article

Basic Research
N⁶-Methyladenosine Methyltransferase METTL3 Alleviates Diabetes-Induced Testicular Damage through Modulating TUG1/Clusterin Axis: Yuan Tian, Yue-Hai Xiao, Chao Sun, Bei Liu, Fa Sun; Diabetes Metab J. 2023;47(2):287-300. Published online January 19, 2023; DOI: https://doi.org/10.4093/dmj.2021.0306

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Background
The present study investigated the regulatory effects of N6-methyladenosine (m6A) methyltransferase like-3 (METTL3) in diabetes-induced testicular damage.
Methods
In vivo diabetic mice and high glucose (HG) treated GC-1 spg cells were established. The mRNA and protein expressions were determined by real-time quantitative polymerase chain reaction, Western blot, immunofluorescence and immunohistochemistry staining. Levels of testosterone, blood glucose, cell viability, and apoptosis were detected by enzyme-linked immunosorbent assay, MTT, and flow cytometry, respectively. Molecular interactions were verified by RNA immunoprecipitation and RNA pull-down assay. Histopathological staining was performed to evaluate testicular injury.
Results
METTL3 and long non-coding RNA taurine up-regulated 1 (lncRNA TUG1) were downregulated in testicular tissues of diabetic mice and HG-treated GC-1 spg cells. METTL3 overexpression could reduce the blood glucose level, oxidative stress and testicular damage but enhance testosterone secretion in diabetic mouse model and HG-stimulated GC-1 spg cells. Mechanically, METTL3-mediated m6A methylation enhanced the stability of TUG1, then stabilizing the clusterin mRNA via recruiting serine and arginine rich splicing factor 1. Moreover, inhibition of TUG1/clusterin signaling markedly reversed the protective impacts of METTL3 overexpression on HG-stimulated GC-1 spg cells.
Conclusion
This study demonstrated that METTL3 ameliorated diabetes-induced testicular damage by upregulating the TUG1/clusterin signaling. These data further elucidate the potential regulatory mechanisms of m6A modification on diabetes-induced testicular injury.

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Review

Complications
Pathophysiologic Mechanisms and Potential Biomarkers in Diabetic Kidney Disease: Chan-Young Jung, Tae-Hyun Yoo; Diabetes Metab J. 2022;46(2):181-197. Published online March 24, 2022; DOI: https://doi.org/10.4093/dmj.2021.0329

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Although diabetic kidney disease (DKD) remains the leading cause of end-stage kidney disease eventually requiring chronic kidney replacement therapy, the prevalence of DKD has failed to decline over the past 30 years. In order to reduce disease prevalence, extensive research has been ongoing to improve prediction of DKD onset and progression. Although the most commonly used markers of DKD are albuminuria and estimated glomerular filtration rate, their limitations have encouraged researchers to search for novel biomarkers that could improve risk stratification. Considering that DKD is a complex disease process that involves several pathophysiologic mechanisms such as hyperglycemia induced inflammation, oxidative stress, tubular damage, eventually leading to kidney damage and fibrosis, many novel biomarkers that capture one specific mechanism of the disease have been developed. Moreover, the increasing use of high-throughput omic approaches to analyze biological samples that include proteomics, metabolomics, and transcriptomics has emerged as a strong tool in biomarker discovery. This review will first describe recent advances in the understanding of the pathophysiology of DKD, and second, describe the current clinical biomarkers for DKD, as well as the current status of multiple potential novel biomarkers with respect to protein biomarkers, proteomics, metabolomics, and transcriptomics.

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Brazilian Journal of Nephrology.2025;[Epub] CrossRef
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Nephrology.2025;[Epub] CrossRef
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The FASEB Journal.2025;[Epub] CrossRef
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Translational Research.2025; 282: 1. CrossRef
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Frontiers in Pharmacology.2025;[Epub] CrossRef
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International Immunopharmacology.2025; 162: 115121. CrossRef
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Diabetes, Metabolic Syndrome and Obesity.2025; Volume 18: 2493. CrossRef
Notch signaling in diabetic kidney disease: recent progress
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Frontiers in Endocrinology.2025;[Epub] CrossRef
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Asprosin Aggravates Tubular Epithelial Cell Injury and Phenotypic Transformation via Mitochondrial Dynamics Disorder Mediated by Excessive Drp1 SUMOylation in Diabetic Nephropathy Mice
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俊杰苏
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Tongyi Yuan, Xiang Gao, Xinxin Wang, Xiaolei Tang, Zuguo Liang, Yifei Yin, Songyan Liu, Jianze Ou, Wenjie Su, Zepeng Zhang, Xiangyan Li, Qingxia Huang, Daqing Zhao, He Zhang
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International Journal of Molecular Sciences.2025; 26(22): 11033. CrossRef
Rhein Inhibits Podocyte Ferroptosis and Epithelial-Mesenchymal Transition in Diabetic Nephropathy by Activating the SIRT1/p53/SLC7A11 Pathway
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Miao Liu, Qiunan Zhan, Junjun Zhu, Junli Zhao, Danyan Min
Diabetes, Metabolic Syndrome and Obesity.2025; Volume 18: 4287. CrossRef
Protective Effects of Hydrogen Treatment Against High Glucose-Induced Oxidative Stress and Apoptosis via Inhibition of the AGEs/RAGE/NF-κB Signaling Pathway in Skin Cells
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Phytomedicine.2024; 122: 155155. CrossRef
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Cytokine.2024; 181: 156683. CrossRef
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Animal Models and Experimental Medicine.2024; 7(5): 653. CrossRef
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Diabetes, Metabolic Syndrome and Obesity.2024; Volume 17: 3295. CrossRef
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American Journal of Physiology-Regulatory, Integrative and Comparative Physiology.2024; 327(4): R410. CrossRef
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Molecular Pathways of Diabetic Kidney Disease Inferred from Proteomics
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Diabetes, Metabolic Syndrome and Obesity.2023; Volume 16: 117. CrossRef
Omics and Artificial Intelligence in Kidney Diseases
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Alessandra Scamporrino, Stefania Di Mauro, Agnese Filippello, Grazia Di Marco, Antonino Di Pino, Roberto Scicali, Maurizio Di Marco, Emanuele Martorana, Roberta Malaguarnera, Francesco Purrello, Salvatore Piro
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Original Article

Basic Research
Hypoxia Increases β-Cell Death by Activating Pancreatic Stellate Cells within the Islet: Jong Jin Kim, Esder Lee, Gyeong Ryul Ryu, Seung-Hyun Ko, Yu-Bae Ahn, Ki-Ho Song; Diabetes Metab J. 2020;44(6):919-927. Published online May 11, 2020; DOI: https://doi.org/10.4093/dmj.2019.0181

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Background

Hypoxia can occur in pancreatic islets in type 2 diabetes mellitus. Pancreatic stellate cells (PSCs) are activated during hypoxia. Here we aimed to investigate whether PSCs within the islet are also activated in hypoxia, causing β-cell injury.

Methods

Islet and primary PSCs were isolated from Sprague Dawley rats, and cultured in normoxia (21% O₂) or hypoxia (1% O₂). The expression of α-smooth muscle actin (α-SMA), as measured by immunostaining and Western blotting, was used as a marker of PSC activation. Conditioned media (hypoxia-CM) were obtained from PSCs cultured in hypoxia.

Results

Islets and PSCs cultured in hypoxia exhibited higher expressions of α-SMA than did those cultured in normoxia. Hypoxia increased the production of reactive oxygen species. The addition of N-acetyl-L-cysteine, an antioxidant, attenuated the hypoxia-induced PSC activation in islets and PSCs. Islets cultured in hypoxia-CM showed a decrease in cell viability and an increase in apoptosis.

Conclusion

PSCs within the islet are activated in hypoxia through oxidative stress and promote islet cell death, suggesting that hypoxia-induced PSC activation may contribute to β-cell loss in type 2 diabetes mellitus.

Citations

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Review

Basic Research
The Role of CD36 in Type 2 Diabetes Mellitus: β-Cell Dysfunction and Beyond: Jun Sung Moon, Udayakumar Karunakaran, Elumalai Suma, Seung Min Chung, Kyu Chang Won; Diabetes Metab J. 2020;44(2):222-233. Published online April 23, 2020; DOI: https://doi.org/10.4093/dmj.2020.0053

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Impaired β-cell function is the key pathophysiology of type 2 diabetes mellitus, and chronic exposure of nutrient excess could lead to this tragedy. For preserving β-cell function, it is essential to understand the cause and mechanisms about the progression of β-cells failure. Glucotoxicity, lipotoxicity, and glucolipotoxicity have been suggested to be a major cause of β-cell dysfunction for decades, but not yet fully understood. Fatty acid translocase cluster determinant 36 (CD36), which is part of the free fatty acid (FFA) transporter system, has been identified in several tissues such as muscle, liver, and insulin-producing cells. Several studies have reported that induction of CD36 increases uptake of FFA in several cells, suggesting the functional interplay between glucose and FFA in terms of insulin secretion and oxidative metabolism. However, we do not currently know the regulating mechanism and physiological role of CD36 on glucolipotoxicity in pancreatic β-cells. Also, the downstream and upstream targets of CD36 related signaling have not been defined. In the present review, we will focus on the expression and function of CD36 related signaling in the pancreatic β-cells in response to hyperglycemia and hyperlipidemia (ceramide) along with the clinical studies on the association between CD36 and metabolic disorders.

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Short Communication

Clinical Diabetes & Therapeutics
Three Months Monitored Metabolic Fitness Modulates Cardiovascular Risk Factors in Diabetic Patients: Ilenia Cirilli, Sonia Silvestri, Fabio Marcheggiani, Fabiola Olivieri, Roberta Galeazzi, Roberto Antonicelli, Rina Recchioni, Fiorella Marcheselli, Tiziana Bacchetti, Luca Tiano, Patrick Orlando; Diabetes Metab J. 2019;43(6):893-897. Published online June 27, 2019; DOI: https://doi.org/10.4093/dmj.2018.0254

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Cardiovascular diseases represent the leading cause of death and moderate physical exercise is associated with a reduction in cardiovascular risk. The aim of the study was to evaluate the correlation between the amount of exercise recorded daily by a wearable gravitometer for 3 months and selected biochemical and clinical parameters. Nineteen sedentary type 2 diabetics were recruited and distributed into three homogenous groups, low, medium, and high exercise, according to the level of physical exercise monitored and expressed as MOVEs. Data showed an inverse correlation between MOVEs and oxidative stress indexes and a significant improvement in paraoxonase-1 activities and endothelial functionality. Decrease of visceral/total adipose tissue ratio, systolic blood pressure and a down-regulation of the inflammatory microRNA-146a in high exercise group were observed. Finally, a decrease of glycosylated hemoglobin and an up-regulation of the angiogenic microRNA-130a in medium exercise one was obtained. In this study, precise daily monitoring permitted to underline the importance of the amount of physical activity to counteract some cardiovascular risk factors persisting in diabetes. Finally, it identifies new microRNA biomarkers for future investigation on the same topic.

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Original Articles

Pathophysiology
Metformin Ameliorates Lipotoxic β-Cell Dysfunction through a Concentration-Dependent Dual Mechanism of Action: Hong Il Kim, Ji Seon Lee, Byung Kook Kwak, Won Min Hwang, Min Joo Kim, Young-Bum Kim, Sung Soo Chung, Kyong Soo Park; Diabetes Metab J. 2019;43(6):854-866. Published online June 27, 2019; DOI: https://doi.org/10.4093/dmj.2018.0179

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Background

Chronic exposure to elevated levels of free fatty acids contributes to pancreatic β-cell dysfunction. Although it is well known that metformin induces cellular energy depletion and a concomitant activation of AMP-activated protein kinase (AMPK) through inhibition of the respiratory chain, previous studies have shown inconsistent results with regard to the action of metformin on pancreatic β-cells. We therefore examined the effects of metformin on pancreatic β-cells under lipotoxic stress.

Methods

NIT-1 cells and mouse islets were exposed to palmitate and treated with 0.05 and 0.5 mM metformin. Cell viability, glucose-stimulated insulin secretion, cellular adenosine triphosphate, reactive oxygen species (ROS) levels and Rho kinase (ROCK) activities were measured. The phosphorylation of AMPK was evaluated by Western blot analysis and mRNA levels of endoplasmic reticulum (ER) stress markers and NADPH oxidase (NOX) were measured by real-time quantitative polymerase chain reaction analysis.

Results

We found that metformin has protective effects on palmitate-induced β-cell dysfunction. Metformin at a concentration of 0.05 mM inhibits NOX and suppresses the palmitate-induced elevation of ER stress markers and ROS levels in a AMPK-independent manner, whereas 0.5 mM metformin inhibits ROCK activity and activates AMPK.

Conclusion

This study suggests that the action of metformin on β-cell lipotoxicity was implemented by different molecular pathways depending on its concentration. Metformin at a usual therapeutic dose is supposed to alleviate lipotoxic β-cell dysfunction through inhibition of oxidative stress and ER stress.

Citations

Citations to this article as recorded by

Metformin promotes lipid droplet-mitochondria coupling and improves insulin secretion in pancreatic β-cells exposed to lipotoxicity
Aneta M. Dobosz, Ewelina Krogulec, Nataniel Stefanowski, Maria Kendziorek, Magdalena Lebiedzinska-Arciszewska, Mariusz R. Wieckowski, Justyna Janikiewicz, Agnieszka Dobrzyn
Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids.2025; 1870(7): 159664. CrossRef
5‐Aminoimidazole‐4‐carboxamide‐1‐β${bf {beta}}$‐d‐ribofuranoside ameliorates lipotoxicity through enhanced reticulophagy in HepG2 cells
Ajay Krishnan U, Anuradha Carani Venkataraman, Vidhya Ramachandran
Biotechnology and Applied Biochemistry.2025;[Epub] CrossRef
Metformin enhances METTL14-Mediated m6A methylation to alleviate NIT-1 cells apoptosis induced by hydrogen peroxide
Si-min Zhou, Xin-ming Yao, Yi Cheng, Yu-jie Xing, Yue Sun, Qiang Hua, Shu-jun Wan, Xiang-jian Meng
Heliyon.2024; 10(2): e24432. CrossRef
Roles of m6A modification in regulating PPER pathway in cadmium-induced pancreatic β cell death
Yifei Sun, Rongxian Li, Wenhong Li, Nan Zhang, Guofen Liu, Bo Zhao, Zongqin Mei, Shiyan Gu, Zuoshun He
Ecotoxicology and Environmental Safety.2024; 282: 116672. CrossRef
Metformin’s effect on metabolic dysfunction-associated steatotic liver disease through the miR-200a-5p and AMPK/SERCA2b pathway
Hang Chen, Minshan Huang, Dan Zhang, Hui Wang, Da Wang, Mengwei Li, Xianmei Wang, Rui Zhu, Jianjun Liu, Lanqing Ma
Frontiers in Pharmacology.2024;[Epub] CrossRef
Reduced Expression Level of Protein PhosphatasePPM1EServes to Maintain Insulin Secretion in Type 2 Diabetes
Sevda Gheibi, Luis Rodrigo Cataldo, Alexander Hamilton, Mi Huang, Sebastian Kalamajski, Malin Fex, Hindrik Mulder
Diabetes.2023; 72(4): 455. CrossRef
Metformin restores prohormone processing enzymes and normalizes aberrations in secretion of proinsulin and insulin in palmitate‐exposed human islets
Quan Wen, Azazul Islam Chowdhury, Banu Aydin, Mudhir Shekha, Rasmus Stenlid, Anders Forslund, Peter Bergsten
Diabetes, Obesity and Metabolism.2023; 25(12): 3757. CrossRef
Treatment of type 2 diabetes mellitus with stem cells and antidiabetic drugs: a dualistic and future-focused approach
Priyamvada Amol Arte, Kanchanlata Tungare, Mustansir Bhori, Renitta Jobby, Jyotirmoi Aich
Human Cell.2023; 37(1): 54. CrossRef
Overexpression of miR-297b-5p in Mouse Insulin-Secreting Cells Promotes Metformin-Mediated Protection Against Stearic Acid-Induced Senescence by Targeting Igf1r
Qingrui Zhao, Shenghan Su, Yuqing Lin, Xuebei Li, Lingfeng Dan, Chunxiao Yang, Chenchen Geng, Romano Regazzi, Xiaohan Li, Yimeng Dong, Changhao Sun, Xia Chu, Huimin Lu
Frontiers in Bioscience-Landmark.2023;[Epub] CrossRef
Metformin disrupts insulin secretion, causes proapoptotic and oxidative effects in rat pancreatic beta‐cells in vitro
Maíra M.R. Valle, Eloisa Aparecida Vilas‐Boas, Camila F. Lucena, Simone A. Teixeira, Marcelo N. Muscara, Angelo R. Carpinelli
Journal of Biochemical and Molecular Toxicology.2022;[Epub] CrossRef
Protection by metformin against severe Covid-19: An in-depth mechanistic analysis
Nicolas Wiernsperger, Abdallah Al-Salameh, Bertrand Cariou, Jean-Daniel Lalau
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Insight Into Rho Kinase Isoforms in Obesity and Energy Homeostasis
Lei Wei, Jianjian Shi
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Overexpression of miR-297b-5p Promotes Metformin-Mediated Protection Against Stearic Acid-Induced Senescence by Targeting Igf1r
Qingrui Zhao, Shenghan Su, Yuqing Lin, Xuebei Li, Lingfeng Dan, Yunjin Zhang, Chunxiao Yang, Xiaohan Li, Yimeng Dong, Chenchen Geng, Changhao Sun, Xia Chu, Huimin Lu
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Metformin Dysregulates the Unfolded Protein Response and the WNT/β-Catenin Pathway in Endometrial Cancer Cells through an AMPK-Independent Mechanism
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Suma Elumalai, Udayakumar Karunakaran, Jun-Sung Moon, Kyu-Chang Won
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Metformin use and cardiovascular outcomes in patients with diabetes and chronic kidney disease: a nationwide cohort study
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Different Effects of Metformin and A769662 on Sodium Iodate-Induced Cytotoxicity in Retinal Pigment Epithelial Cells: Distinct Actions on Mitochondrial Fission and Respiration
Chi-Ming Chan, Ponarulselvam Sekar, Duen-Yi Huang, Shu-Hao Hsu, Wan-Wan Lin
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Metformin Reduces Lipotoxicity-Induced Meta-Inflammation in β-Cells through the Activation of GPR40-PLC-IP3 Pathway
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Serum Ceruloplasmin Level as a Predictor for the Progression of Diabetic Nephropathy in Korean Men with Type 2 Diabetes Mellitus: Min Jung Lee, Chang Hee Jung, Yu Mi Kang, Jung Eun Jang, Jaechan Leem, Joong-Yeol Park, Woo Je Lee; Diabetes Metab J. 2015;39(3):230-239. Published online April 22, 2015; DOI: https://doi.org/10.4093/dmj.2015.39.3.230

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Background

Oxidative stress is known to be associated with progression of diabetic kidney disease. Ceruloplasmin acts as a pro-oxidant under conditions of severe oxidative stress. Thus, we conducted a longitudinal observational study to evaluate whether the serum ceruloplasmin level is a predictive biomarker for progression of diabetic nephropathy.

Methods

A total of 643 Korean men with type 2 diabetes mellitus were enrolled. Serum ceruloplasmin was measured using a nephelometric method. Progression of diabetic nephropathy was defined as transition in albuminuria class (i.e., normoalbuminuria to microalbuminuria, microalbuminuria to macroalbuminuria, or normoalbuminuria to macroalbuminuria) and/or a greater than 2-fold increase of serum creatinine at follow-up compared with the baseline value.

Results

During the follow-up period (median, 2.7 years; range, 0.3 to 4.4 years), 49 of 643 patients (7.6%) showed the progression of diabetic nephropathy and three patients (0.5%) developed end-stage renal disease. Baseline ceruloplasmin levels were higher in the progressors than in the nonprogressors (262.6±40.9 mg/L vs. 233.3±37.8 mg/L, P<0.001). Kaplan-Meier analysis showed a significantly higher incidence of nephropathy progression according to ceruloplasmin tertile (log-rank test, P<0.001). The hazard ratio (HR) for progression of diabetic nephropathy was significantly higher in the highest ceruloplasmin tertile category compared with the lowest ceruloplasmin tertile category, even after adjusting for confounding variables (HR, 3.32; 95% confidence interval, 1.28 to 8.61; P=0.003).

Conclusion

Baseline serum ceruloplasmin is an independent predictive factor for the progression of diabetic nephropathy in patients with type 2 diabetes mellitus.

Citations

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Reviews

Diabetic Cardiomyopathy and Its Prevention by Nrf2: Current Status: Jing Chen, Zhiguo Zhang, Lu Cai; Diabetes Metab J. 2014;38(5):337-345. Published online October 17, 2014; DOI: https://doi.org/10.4093/dmj.2014.38.5.337

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Abstract PDF PubReader ePub

Diabetic cardiomyopathy (DCM), as one of the major cardiac complications in diabetic patients, is known to related with oxidative stress that is due to a severe imbalance between reactive oxygen species (ROS) and/or reactive nitrogen species (RNS) generation and their clearance by antioxidant defense systems. Transcription factor nuclear factor NF-E2-related factor 2 (Nrf2) plays an important role in maintaining the oxidative homeostasis by regulating multiple downstream antioxidants. Diabetes may up-regulate several antioxidants in the heart as a compensative mechanism at early stage, but at late stage, diabetes not only generates extra ROS and/or RNS but also impairs antioxidant capacity in the heart, including Nrf2. In an early study, we have established that Nrf2 protect the cardiac cells and heart from high level of glucose in vitro and hyperglycemia in vivo, and in the following study demonstrated the significant down-regulation of cardiac Nrf2 expression in diabetic animals and patients. Using Nrf2-KO mice or Nrf2 inducers, blooming evidence has indicated the important protection by Nrf2 from cardiac pathogenesis in the diabetes. Therefore, this brief review summarizes the status of studies on Nrf2's role in preventing DCM and even other complications, the need for new and safe Nrf2 inducer screening and the precaution for the undesirable side of Nrf2 under certain conditions.

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The Role of Oxidative Stress in the Pathogenesis of Diabetic Vascular Complications: Shuji Sasaki, Toyoshi Inoguchi; Diabetes Metab J. 2012;36(4):255-261. Published online August 20, 2012; DOI: https://doi.org/10.4093/dmj.2012.36.4.255

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Oxidative stress has been paid increasing attention to as an important causative factor for diabetic vascular complications. Among possible various sources, accumulating evidence has indicated that NAD(P)H oxidase may be the most important source for reactive oxygen species production in diabetic vascular tissues. The mechanisms underlying activation and up-regulation of NAD(P)H oxidase has been supposed to be mediated by high glucose-induced protein kinase C (PKC) activation. In this review article, activation of local renin-angiotensin II system induced by chymase activation is also shown to amplify such a PKC-dependent activation of NAD(P)H oxidase. Additionally, human evidence showing the beneficial effect of antioxidants on diabetic vascular complications. Bilirubin has been recognized as a strong endogenous antioxidant. Here markedly lower prevalence of vascular complications is shown in diabetic patients with Gilbert syndrome, a congenital hyperbilirubinemia, as well as reduced markers of oxidative stress and inflammation. Lastly, statin, angiotensin II receptor blocker, chymase inhibitor, bilirubin and biliverdin, PKC β isoform inhibitor, and glucagon-like peptide-1 analog, are shown to serve as antioxidants and have some beneficial effect on diabetic vascular complications, via inhibiting PKC-NAD(P)H oxidase activation, supporting the notion that this mechanism may be an effective therapeutic target for preventing diabetic vascular complications.

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Original Articles

Decreased Expression and Induced Nucleocytoplasmic Translocation of Pancreatic and Duodenal Homeobox 1 in INS-1 Cells Exposed to High Glucose and Palmitate: Gyeong Ryul Ryu, Jun Mo Yoo, Esder Lee, Seung-Hyun Ko, Yu-Bae Ahn, Ki-Ho Song; Diabetes Metab J. 2011;35(1):65-71. Published online February 28, 2011; DOI: https://doi.org/10.4093/dmj.2011.35.1.65

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Abstract PDF PubReader ePub

Background

Type 2 diabetes mellitus (T2DM) is often accompanied by increased levels of circulating fatty acid. Elevations in fatty acids and glucose for prolonged periods of time have been suggested to cause progressive dysfunction or apoptosis of pancreatic beta cells in T2DM. However, the precise mechanism of this adverse effect is not well understood.

Methods

INS-1 rat-derived insulin-secreting cells were exposed to 30 mM glucose and 0.25 mM palmitate for 48 hours.

Results

The production of reactive oxygen species increased significantly. Pancreatic and duodenal homeobox 1 (Pdx1) expression was down-regulated, as assessed by reverse transcription-polymerase chain reaction and Western blot analyses. The promoter activities of insulin and Pdx1 were also diminished. Of note, there was nucleocytoplasmic translocation of Pdx1, which was partially prevented by treatment with an antioxidant, N-acetyl-L-cysteine.

Conclusion

Our data suggest that prolonged exposure of beta cells to elevated levels of glucose and palmitate negatively affects Pdx1 expression via oxidative stress.

Citations

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miRNA-642a-3p protects β cells from glucolipotoxicity
Sandra Sofia Pinhanços, João Teixeira de Oliveira, C. Henrique Alves, Cláudia M. Deus, Twan J.J. de Winter, Sofia Viana, Flávio Reis, Jorge Santos, Mijke Buitinga, Françoise Carlotti, Lino Ferreira, Martin Gotthardt, John Jones, Hugo Fernandes
Molecular Therapy Nucleic Acids.2025; 36(2): 102498. CrossRef
Nrf2 Activation Protects Mouse Beta Cells from Glucolipotoxicity by Restoring Mitochondrial Function and Physiological Redox Balance
Johanna Schultheis, Dirk Beckmann, Dennis Mulac, Lena Müller, Melanie Esselen, Martina Düfer
Oxidative Medicine and Cellular Longevity.2019; 2019: 1. CrossRef
Early overnutrition reduces Pdx1 expression and induces β cell failure in Swiss Webster mice
Maria M. Glavas, Queenie Hui, Eva Tudurí, Suheda Erener, Naomi L. Kasteel, James D. Johnson, Timothy J. Kieffer
Scientific Reports.2019;[Epub] CrossRef
Anti-diabetic effect of mulberry leaf polysaccharide by inhibiting pancreatic islet cell apoptosis and ameliorating insulin secretory capacity in diabetic rats
Yao Zhang, Chunjiu Ren, Guobing Lu, Zhimei Mu, Weizheng Cui, Huiju Gao, Yanwen Wang
International Immunopharmacology.2014; 22(1): 248. CrossRef
The Furan Fatty Acid Metabolite CMPF Is Elevated in Diabetes and Induces β Cell Dysfunction
Kacey J. Prentice, Lemieux Luu, Emma M. Allister, Ying Liu, Lucy S. Jun, Kyle W. Sloop, Alexandre B. Hardy, Li Wei, Weiping Jia, I. George Fantus, Douglas H. Sweet, Gary Sweeney, Ravi Retnakaran, Feihan F. Dai, Michael B. Wheeler
Cell Metabolism.2014; 19(4): 653. CrossRef

The Association between Serum GGT Concentration and Diabetic Peripheral Polyneuropathy in Type 2 Diabetic Patients: Ho Chan Cho; Korean Diabetes J. 2010;34(2):111-118. Published online April 30, 2010; DOI: https://doi.org/10.4093/kdj.2010.34.2.111

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Background

Diabetic peripheral polyneuropathy (DPP) is one of the common complications of diabetes mellitus (DM) and can lead to foot ulcers or amputation. The pathophysiology of DPP includes several factors such as metabolic, vascular, autoimmune, oxidative stress and neurohormonal growth-factor deficiency and recent studies have suggested the use of serum gamma-glutamyl transferase (GGT) as an early marker of oxidative stress. Therefore, we investigated whether serum GGT may be useful in predicting DPP.

Methods

We assessed 90 patients with type 2 DM who were evaluated for the presence of DPP using clnical neurologic examinations including nerve conduction velocity studies. We evaluated the association between serum GGT and the presence of DPP.

Results

The prevalence of DPP was 40% (36 cases) according to clinical neurological examinations. The serum GGT concentration was significantly elevated in type 2 diabetic patients with DPP compared to patients without DPP (P < 0.01). There were other factors significantly associated with DPP including smoking (P = 0.019), retinopathy (P = 0.014), blood pressure (P < 0.05), aspartate aminotransferase (P = 0.022), C-reactive protein (P = 0.036) and urine microalbumin/creatinine ratio (P = 0.004). Serum GGT was independently related with DPP according to multiple logistic analysis (P < 0.01).

Conclusion

This study shows that increased levels of serum GGT may have important clinical implications in the presence of DPP in patients with type 2 diabetes.

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High Glucose and/or Free Fatty Acid Damage Vascular Endothelial Cells via Stimulating of NAD(P)H Oxidase-induced Superoxide Production from Neutrophils.: Sang Soo Kim, Sun Young Kim, Soo Hyung Lee, Yang Ho Kang, In Ju Kim, Yong Ki Kim, Seok Man Son; Korean Diabetes J. 2009;33(2):94-104. Published online April 1, 2009; DOI: https://doi.org/10.4093/kdj.2009.33.2.94

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Abstract PDF: BACKGROUND
Oxidative stress and inflammation are important factors in the pathogenesis of diabetes and contribute to the development of diabetic complications. To understand the mechanisms that cause vascular complications in diabetes, we examined the effects of high glucose and/or free fatty acids on the production of superoxide from neutrophils and their role in endothelial cell damage. METHODS: Human neutrophils were incubated in the media containing 5.5 mM D-glucose, 30 mM D-glucose, 3 nM oleic acid, or 30 microM oleic acid for 1 hour to evaluate superoxide production through NAD(P)H oxidase activation. Human aortic endothelial cells were co-cultured with neutrophils exposed to high glucose and oleic acid. We then measured neutrophil adhesion to endothelial cells, neutrophil activation and superoxide production, neutrophil-mediated endothelial cell cytotoxicity and subunits of neutrophil NAD(P)H oxidase. RESULTS: After 1 hour of incubation with various concentrations of glucose and oleic acid, neutrophil adherence to high glucose and oleic acid-treated endothelial cells was significantly increased compared with adhesion to low glucose and oleic acid-treated endothelial cells. Incubation of neutrophils with glucose and free fatty acids increased superoxide production in a dose-dependent manner. High glucose and oleic acid treatment significantly increased expression of the membrane components of NAD(P)H oxidase of neutrophil (gp91(phox)). Endothelial cells co-cultured with neutrophils exposed to high glucose and oleic acid showed increased cytolysis, which could be prevented by an antioxidant, N-acetylcysteine. CONCLUSION: These results suggest that high glucose and/orfree fatty acidsincrease injury of endothelial cells via stimulating NAD(P)H oxidase-induced superoxide production from neutrophils.

Review

Oxidative Stress and Cell Dysfunction in Diabetes: Role of ROS Produced by Mitochondria and NAD(P)H Oxidase.: Sang Soo Kim, Seok Man Son; Korean Diabetes J. 2008;32(5):389-398. Published online October 1, 2008; DOI: https://doi.org/10.4093/kdj.2008.32.5.389

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Abstract PDF

Oxidative stress has been considered to be a major contributor to the pathogenesis of the diabetic macrovascular and microvascular complications. In the absence of an appropriate antioxidant defense mechanism, increased oxidative stress leads to the activation of stress-sensitive intracellular signaling pathways and the formation of gene products that cause damage and contribute to the late complications ofdiabetes. The source of reactive oxygen species (ROS) in the pancreatic beta cells and insulin sensitive cells has postulated to be the mitochondrial electron transport chain. NAD(P)H oxidase-dependent ROS production is also important as the source both in pancreatic beta cells and other cells. NAD(P)H oxidase mediated ROS can alter parameters of signal transduction, insulin secretion, insulin action, cell proliferation and cell death. Additionally, oxidative stress as the pathogenic mechanism linking insulin resistance with dysfunction of both pancreatic beta cells and endothelial cells, eventually leads to diabetes and its complications. Further investigation of the mechanisms and its therapeutic interventions based on focusing NAD(P)H oxidase associated ROS production in the islet cells and other islet cells are needed

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Original Articles

Migration of Vascular Smooth Muscle Cells by High Glucose is Reactive Oxygen Dependent.: Yong Seong An, Ji Hae Kwon, Yang Ho Kang, In Ju Kim, Yong Ki Kim, Seok Man Son; Korean Diabetes J. 2008;32(3):185-195. Published online June 1, 2008; DOI: https://doi.org/10.4093/kdj.2008.32.3.185

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Abstract PDF: BACKGROUND
Oxidative stress contributes to vascular diseases in patients with diabetes. As the mechanism of development and progression of diabetic vascular complications is poorly understood, this study was aimed to assess the potential role of hyperglycemia-induced oxidative stress and to determine whether the oxidative stress is a major factor in hyperglycemia-induced migration of vascular smooth muscle cells (VSMCs). METHODS: We treated primary cultured rat aortic smooth muscle cells for 72 hours with medium containing 5.5 mM D-glucose (normal glucose), 30 mM D-glucose (high glucose) or 5.5 mM D-glucose plus 24.5 mM mannitol (osmotic control). We measured the migration of VSMCs and superoxide production. Immunoblotting of PKC isozymes using phoshospecific antibodies was performed, and PKC activity was also measured. RESULTS: Migration of VSMCs incubated under high glucose condition were markedly increased compared to normal glucose condition. Treatment with diphenyleneiodonium (DPI, 10 micromol/L) and superoxide dismutase (SOD, 500 U/mL) significantly suppressed high glucose-induced migration of VSMCs. Superoxide production was significantly increased in high glucose condition and was markedly decreased after treatment with DPI and SOD. High glucose also markedly increased activity of PKC-delta isozyme. When VSMCs were treated with rottlerin or transfected with PKC-delta siRNA, nitro blue tetrazolium (NBT) staining and NAD(P)H oxidase activity were significantly attenuated in the high glucose-treated VSMCs. Furthermore, inhibition of PKC-delta markedly decreased VSMC migration by high glucose. CONCLUSION: These results suggest that high glucose-induced VSMC migration is dependent upon activation of PKC-delta, which may responsible for elevated intracellular ROS production in VSMCs, and this is mediated by NAD(P)H oxidase.

The Protective Effect of EGCG on INS-1 Cell in the Oxidative Stress and Mechanism.: Mi Kyung Kim, Hye Sook Jung, Chang Shin Yoon, Min Jeong Kwon, Kyung Soo Koh, Byung Doo Rhee, Jeong Hyun Park; Korean Diabetes J. 2008;32(2):121-130. Published online April 1, 2008; DOI: https://doi.org/10.4093/kdj.2008.32.2.121

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Abstract PDF

BACKGROUND
Oxidative stress is important in both diabetic complications and the development and the progression of type 2 diabetes via the effects on the pancreatic beta-cells. EGCG (epigallocatechin galleate), a major constituent of green tea, has been known to have beneficial effects on various diseases through the mechanisms of antioxidant and cell signaling modulation. But, very small numbers of studies were published about the direct effects of EGCG on the pancreatic beta cell lines. We performed this study to see the protective effect of EGCG on pancreatic beta cell line under H2O2 and the mechanisms of this phenomenon. METHODS: We used INS-1 cells and hydrogen peroxide as an oxidative stressor. Their viabilities were verified by MTT assay and FACS. The activity of glutathione peroxidase was assessed by total glutathione quantification kit. Western blot and semi-quantitative RT-PCR for the catalase, SOD (superoxide dismutase), PI3K and Akt were performed. Functional status of INS-1 cells was tested by GSIS (glucose stimulated insulin secretion). RESULTS: The biological effects of EGCG were different according to its concentrations. 10 micrometer EGCG effectively protected hydrogen peroxide induced damage in INS-1 cells. The expression and the activity of SOD, catalase and the glutathione peroxidase were significantly increased by EGCG. EGCG significantly increased PI3K and Akt activity and its effect was inhibited partially by wortmannin. GSIS was well preserved by EGCG. CONCLUSION: EGCG in low concentration effectively protected INS-1 cells from the oxidative stress through the activation of both antioxidant systems and anti-apoptosis signaling. Further studies will be necessary for the more detailed mechanisms and the clinical implications.

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Suppressive Effects of Epigallocatechin Gallate Pretreatment on the Expression of Inflammatory Cytokines in RAW264.7 Cells Activated by Lipopolysaccharide
Eun Ji Seo, Jun Go, Ji Eun Kim, Eun Kyoung Koh, Sung Hwa Song, Ji Eun Sung, Chan Kyu Park, Hyun Ah Lee, Dong Seob Kim, Hong Joo Son, Cung Yeoul Lee, Hee Seob Lee, Dae Youn Hwang
Journal of Life Science.2015; 25(9): 961. CrossRef
The Protective Effects of Chrysanthemum cornarium L. var. spatiosum Extract on HIT-T15 Pancreatic β-Cells against Alloxan-induced Oxidative Stress
In-Hye Kim, Kang-Jin Cho, Jeong-Sook Ko, Jae-Hyun Kim, Ae-Son Om
The Korean Journal of Food And Nutrition.2012; 25(1): 123. CrossRef
Protective Effects of Sasa Borealis Leaves Extract on High Glucose-Induced Oxidative Stress in Human Umbilical Vein Endothelial Cells
Ji-Young Hwang, Ji-Sook Han
Journal of the Korean Society of Food Science and Nutrition.2010; 39(12): 1753. CrossRef

Cytoprotective Effect by Antioxidant Activity of Quercetin in INS-1 Cell Line.: Min Jeong Kwon, Hye Sook Jung, Mi Kyung Kim, Seong Hoon Kang, Gwang Wook Seo, Jae Kwang Song, Tae Yeon Yoon, Min Kyeong Jeon, Tae Hwan Ha, Chang Shin Yoon, Mi Kyung Kim, Woo Je Lee, Jeong Hyun Noh, Soo Kyung Kwon, Dong Joon Kim, Kyung Soo Koh, Byung Doo Rhee, Kyung Ho Lim, Soon Hee Lee, Jeong Hyun Park; Korean Diabetes J. 2007;31(5):383-390. Published online September 1, 2007; DOI: https://doi.org/10.4093/jkda.2007.31.5.383

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BACKGROUND
Oxidative stress is induced under diabetic conditions and causes various forms of tissue damages in the patients with diabetes. Recently, pancreatic beta cells are regarded as a putative target of oxidative stress-induced tissue damage, and this seems to explain in part the progressive deterioration of beta cell function in type 2 diabetes. The aim of this study was to examine the potential of Quercetin (QE) to protect INS-1 cells from the H2O2-induced oxidative stress and the effects of QE on the glucose-stimulated insulin secretion in INS-1 cells. METHODS: To study the cell viability, cells were incubated with H2O2 and/or QE at the various concentrations. To confirm the protective effect by QE in response to H2O2, the levels of antioxidant enzymes were assessed by RT-PCR and Western blot, and glutathione peroxidase activities were quantified by spectrophotometrical method. Glucose-stimulated insulin secretion (GSIS) was measured by ELISA. RESULTS: Cell incubations were performed with 80 microM of H2O2 for 5 hours to induce 40 - 50% of cell death. QE gradually showed protective effect (IC50 = 50 microM) in dose-dependent manner. Superoxide dismutase (SOD) mRNA level in H2O2 + QE group was increased as compared to H2O2 group, but catalase did not changed. And the QE recruited glutathione peroxidase activity against H2O2-induced oxidative injuries in INS-1 cells. CONCLUSION: In conclusion, these findings suggest that QE might have protective effect on beta cells by ameliorating oxidative stress and preserving insulin secretory function.

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Anti-diabetic effects of Allium tuberosum rottler extracts and lactic acid bacteria fermented extracts in type 2 diabetic mice model
Bae Jin Kim, Seung Kyeung Jo, Yoo Seok Jeong, Hee Kyoung Jung
Korean Journal of Food Preservation.2015; 22(1): 134. CrossRef
Protective Effects of Sasa Borealis Leaves Extract on High Glucose-Induced Oxidative Stress in Human Umbilical Vein Endothelial Cells
Ji-Young Hwang, Ji-Sook Han
Journal of the Korean Society of Food Science and Nutrition.2010; 39(12): 1753. CrossRef

Activation of NF-kappaB and AP-1 in Peripheral Blood Mononuclear Cells Isolated from Patients with Diabetic Nephropathy.: Jisun Nam, Min Ho Cho, Jong Suk Park, Geun Taek Lee, Hai Jin Kim, Eun Seok Kang, Yu Mie Lee, Chul Woo Ahn, Bong Soo Cha, Eun Jig Lee, Sung Kil Lim, Kyung Rae Kim, Hun Joo Ha, Hyun Chul Lee; Korean Diabetes J. 2007;31(3):261-273. Published online May 1, 2007; DOI: https://doi.org/10.4093/jkda.2007.31.3.261

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Abstract PDF: BACKGROUND
We evaluated the role of oxidative stress in diabetic nephropathy by measuring intracellular reactive oxygen species (ROS) and redox-sensitive transcription factors in isolated peripheral mononuclear cells (PBMC). METHODS: From 66 diabetic patients with or without diabetic nephropathy (Group III and II, respectively) and 49 normal control subjects (Group I), spontaneous and stimulated ROS levels, activities of nuclear factor-kappa B (NF-kappaB), activator protein-1 (AP-1), and specificity protein1 (Sp1) in PBMC, urinary and PBMC TGF-beta1 (transforming growth factor-beta1), and 24-hour urinary albumin excretion (UAE) were measured. RESULTS: Spontaneous ROS was significantly higher in group III and II than group I (60.7 +/- 3.3 vs. 60.0 +/- 3.0 vs. 41.1 +/- 2.4%, respectively), and stimulated ROS were significantly higher in Group III compared to Group II (Increment of H2O2-induced ROS production: 21.8 +/- 2.2 vs. 11.1 +/- 2.0%, respectively; increment of PMA-induced ROS production 23.5 +/- 4.5 vs. 21.6 +/- 2.2%, respectively). The activities of NF-kappaB and AP-1, but not of Sp1, were significantly higher in Group III than in Group II (2.53 vs. 2.0 vs. 1.43-fold, respectively). Both PBMC- and urinary TGF-beta1 levels were higher in Group III than Group II (3.23 +/- 0.39 vs. 1.99 +/- 0.68 ng/mg in PBMCs, 16.88 +/- 6.84 vs. 5.61 +/- 1.57 ng/mL in urine, both respectively), and they were significantly correlated with activities of NF-kappaB and AP-1 and 24-hour UAE. CONCLUSIONS: Increased intracellular ROS generation in PBMCs of diabetic patients is involved in the pathogenesis of diabetic nephropathy through activation of NF-kappaB and AP-1, but not Sp1, and increased expression of TGF-beta1.

Mechanism of 2-Deoxy-D-ribose-induced Damage in Pancreatic beta-cells.: Gwanpyo Koh, Jeong taek Woo, Dae Ho Lee, Seungjoon Oh, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Deok Bae Park; Korean Diabetes J. 2007;31(2):105-112. Published online March 1, 2007; DOI: https://doi.org/10.4093/jkda.2007.31.2.105

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Abstract PDF

BACKGROUND
Mechanism for glucose toxicity is known to be an increased oxidative stress produced by multiple pathways. In our previous report, 2-deoxy-d-ribose (dRib) promoted apoptosis by increasing oxidative stress in a pancreatic beta-cell line. We performed this study to investigate the mechanism of dRib-induced damage of beta-cells. METHODS: HIT-T15 cells were cultured in RPMI-1640 medium with 40 mM dRib for 24 hours after pretreatment with various concentrations of a metal chelator (DTPA) and inhibitors of protein glycation (aminoguanidine and pyridoxamine). Cell viability was determined by MTT assay. Apoptosis was analyzed by flow cytometry with annexin V/PI double staining. RESULTS: DTPA, which inhibits the monosaccharide autoxidation, partially reversed dRib-induced cytotoxicity in a dose-dependent manner (P < 0.01). The cytotoxicity was also suppressed dose-dependently by aminoguanidine (AG) and pyridoxamine (PM) (P < 0.05 and P < 0.01, repectively). Flow cytometric analysis showed that pretreatment of DTPA and AG also reversed the dRib-triggered apoptosis in a dose-dependent manner. We assessed the additional protective effects of inhibitors of protein glycation from dRib-induced cytotoxiciy in the presence of a metal chelator. The additions of AG (P < 0.05) and PM (P < 0.01) significantly reduced the cytotoxicity compared with DTPA alone group. CONCLUSION: This results suggest that dRib produce cytotoxicity and apoptosis through the mechanisms of advanced glycation endproducts (AGEs) formation including the monsaccharide autoxidation and protein glycation in pancreatic beta-cell. Thus, dRib could be a surrogate for glucose in the study of glucose toxicity and chronic diabetic complications.

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Isolation of Citrus Peel Flavonoid Bioconversion Microorganism and Inhibitory Effect on the Oxidative Damage in Pancreatic Beta Cells
Chi-Deok Park, Hee-Kyung Jung, Chang-Ho Park, Yoo-Seok Jung, Joo-Heon Hong, Hee-Sun Ko, Dong-Hee Kang, Hyun-Soo Kim
KSBB Journal.2012; 27(1): 67. CrossRef
Kaempferol protects HIT‐T15 pancreatic beta cells from 2‐deoxy‐D‐ribose‐induced oxidative damage
Yun Jung Lee, Kwang Sik Suh, Moon Chan Choi, Suk Chon, Seungjoon Oh, Jeong‐Taek Woo, Sung‐Woon Kim, Jin‐Woo Kim, Young Seol Kim
Phytotherapy Research.2010; 24(3): 419. CrossRef

Oxidative Stress Causes Vascular Insulin Resistance in OLETF Rat Through Increased IRS-1 Degradation.: Jung Lae Park, Young Sil Lee, Bo Hyun Kim, Yang Ho Kang, In Ju Kim, Yong Ki Kim, Seok Man Son; Korean Diabetes J. 2007;31(1):22-32. Published online January 1, 2007; DOI: https://doi.org/10.4093/jkda.2007.31.1.22

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Abstract PDF

BACKGROUND
Insulin resistance and oxidative stress have been reported to play essential pathophysiological roles in diabetic cardiovascular complication. The relationship between insulin resistance and oxidative stress in vasculature remains unclear. The study was conducted to assess whether oxidative stress induce vascular insulin resistance in OLETF rat, a model of type 2 diabetes METHODS: We used OLETF rats (20/30/40 weeks, n = 5/5/5), as models of type 2 DM, and LETO rats (20/30/40 weeks, n = 5/5/5) as controls. Aortas of each rats were extracted. Superoxide anion production was detected by NBT assay and lucigenin assay. 8-hydroxyguanosine (OHdG) and nitrotyrosine were detected as markers of oxidative stress in 20 and 40 weeks groups. The glucose uptake of aortas was measured by detecting 2-deoxyglucose uptake in both groups. The expression of IR, IRS-1, PI3-K and Akt/PKB were detected by immuno precipitation and immunoblotting in 20, 30 and 40 weeks groups RESULTS: Superoxide anion production and markers of oxidative stress (8-OHdG, nitrotyrosine) were significantly increased in aortas of OLETF rats compared with controls. Aortas of OLETF rats exhibited decreased IRS-1 content and increased phosphorylation of IRS-1 at Ser307 compared with LETO rats. There were no significant differences in expressions of IR, PI3-K and Akt/PKB between two groups CONCLUSION: These results suggest that oxidative stress induces insulin resistance in vasculature of OLETF rat specifically through increasing serine phosphorylation of IRS-1 and its degradation by a proteasome-dependent pathway, providing an alternative mechanism that may explain the association with insulin resistance and diabetic vascular complications.

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Anti-diabetic effects of benfotiamine on an animal model of type 2 diabetes mellitus
Kang Min Chung, Wonyoung Kang, Dong Geon Kim, Hyun Ju Hong, Youngjae Lee, Chang-Hoon Han
Korean Journal of Veterinary Research.2014; 54(1): 21. CrossRef

Glucose Oxidation and Production of Reactive Oxygen Species (ROS) in INS-1 Cells and Rat Islet Cells Exposed to High Glucose.: Ji Sung Yoon, Kyu Chang Won, Hyoung Woo Lee; Korean Diabetes J. 2006;30(4):246-253. Published online July 1, 2006; DOI: https://doi.org/10.4093/jkda.2006.30.4.246

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Abstract PDF

BACKGROUND
Chronic exposure of pancreatic islets to supraphysiologic concentrations of glucose causes beta cell dysfunction that is a process known as glucose toxicity. It has been reported that hyperglycemia increases the production of reactive oxygen species (ROS) in human islets and that ROS accumulation causes beta cell dysfunction associated with low capacity of intrinsic antioxidant enzymes. Also it has been postulated that this increase in ROS is prevented by an inhibitor of electron transport chain complex. The purpose of this study were to determine whether prolonged exposure of pancreatic islets to supraphysiologic glucose concentrations disrupts the intracellular balance between ROS thereby causing defective insulin secretion and to evaluate the site of hyperglycemia-induced ROS production. METHODS: INS-1 cells & rat islets were incubated in increasing concentrations of glucose and either an inhibitor of complex I & II (TTFA), an uncoupler of oxidative phosphorylation (CCCP), aCCA, etc and also incubated in increasing concentration of glyceraldehyde and N-acetylcystein. Then intracellular peroxide levels by flow cytometric analysis and glucose induced insulin secretion were detected. RESULTS: We observed that incubation with 30 mM glucose increased intracellular peroxide levels but decreased glucose-stimulated insulin secretion (GSIS) (P < 0.05). Exposure to TTFA, CCCP, aCCA did not reduce this increased intracellular peroxide levels, and did not increase GSIS (P < 0.05). 24-h incubation with glyceraldehyde at 5.6 mM glucose increased intracellular peroxide levels and decreased insulin content. CONCLUSION: These observations indicate that there might be other origins in which ROS species are produced besides electron transport chain in mitochondria and glyceraldehyde may be a key molecule to produce ROS, and induce beta cell dysfunction.

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Reactive oxygen species in biological systems: Pathways, associated diseases, and potential inhibitors—A review
Abdur Rauf, Anees Ahmed Khalil, Samir Awadallah, Shahid Ali Khan, Tareq Abu‐Izneid, Muhammad Kamran, Hassan A. Hemeg, Mohammad S. Mubarak, Ahood Khalid, Polrat Wilairatana
Food Science & Nutrition.2024; 12(2): 675. CrossRef
The Protective Effects of Chrysanthemum cornarium L. var. spatiosum Extract on HIT-T15 Pancreatic β-Cells against Alloxan-induced Oxidative Stress
In-Hye Kim, Kang-Jin Cho, Jeong-Sook Ko, Jae-Hyun Kim, Ae-Son Om
The Korean Journal of Food And Nutrition.2012; 25(1): 123. CrossRef

Protective Effect of PGC-1 on Lipid Overload-induced Apoptosis in Vascular Endothelial Cell.: Eun Hee Koh, Youn Mi Kim, Ha Jung Kim, Woo Je Lee, Jong Chul Won, Min Seon Kim, Ki Up Lee, Joong Yeol Park; Korean Diabetes J. 2006;30(3):151-160. Published online May 1, 2006; DOI: https://doi.org/10.4093/jkda.2006.30.3.151

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Abstract PDF: BACKGROUND
Fatty acids contribute to endothelial cell dysfunction and apoptosis by inducing accumulation of long chain fatty acyl CoA (LCAC), which increases oxidative stress in vascular endothelial cells. Forced expression of PGC-1 was shown to induce mitochondrial biogenesis and to control expression of mitochondrial enzymes involved in fatty acid oxidation. This study was undertaken to test the hypothesis that PGC-1 overexpression could prevent endothelial cell apoptosis by enhancing fatty acid oxidation and relieving oxidative stress in vascular endothelium. METHODS: Adenoviruses containing human PGC-1 (Ad-PGC-1) and beta-galactosidase (Ad-beta-gal) were transfected to confluent human aortic endothelial cells (HAECs). To investigate the effect of adenoviral PGC-1 gene transfer on apoptosis, combined treatment of linoleic acid (LA), an unsaturated fatty acid, was performed. RESULTS: PGC-1 overexpression inhibited the increase in ROS production and apoptosis of HAECs induced by LA. Also, PGC-1 led to a significant increase in fatty acid oxidation and decrease in triglyceride content in HAECs. LA caused the decrease of adenine nucleotide translocase (ANT) activity and transient mitochondrial hyperpolarization, which was followed by depolarization. PGC-1 overexpression prevented these processes. CONCLUSION: In summary, PGC-1 overexpression inhibited mitochondrial dysfunction and apoptosis by facilitating fatty acid oxidation and protecting against the damage from oxidative stress in HAECs. The data collectively suggest that the regulation of intracellular PGC-1 expression might play a critical role in preventing atherosclerosis.

Oxidative Stress of INS-1 Cell, HIT-T15 Cell and Rat Islet Cell as a Mechanism of Glucose Toxicity.: Mi Jung Eun, Kyu Chang Won, Jun Sung Moon, Sun Jung Mun, Ji Eun Lee, Ji Sung Yoon, Kyung Ah Chun, Ihn Ho Cho, Hyoung Woo Lee; Korean Diabetes J. 2005;29(5):393-400. Published online September 1, 2005

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Abstract PDF: BACKGOUND: Chronic hyperglycemia is the proximate cause of many complications of diabetes. The beta cells in type 2 diabetes are also adversely affected by chronic hyperglycemia, with this relentless deterioration in cell function, due to constant exposure to supraphysiologic concentrations of glucose, is termed glucose toxicity; however, the mechanism of glucose toxicity is uncertain. The purpose of this study was to determine whether prolonged exposure of pancreatic islets to supraphysiologic glucose concentration disrupts the intracellular balance between reactive oxygen species(ROS) and antioxidant enzyme; thereby, causing defective insulin secretion. METHODS: HIT-T15 cells were treated with H2O2(20, 50 and 100micrometer) directly added to the culture media, and then intracellular peroxide and insulin mRNA were then measured. The effects of H2O2 on the total peroxide level and insulin secretion were also examined. Isolated pancreatic islet cells from Wistar and 2 beta cell lines (INS-1, HIT-T15) were cultured in either a glucose or ribose (5.6, 11.1, 22.2, 30 and 50mM) containing culture media for 72hours. The intracellular peroxide was measured using flow cytometry and glucose stimulated insulin secretion(GSIS). RESULTS: The intracellular peroxide levels due to H2O2 in HIT-T15 cells were higher with a high concentration of H2O2, and the insulin mRNA in HIT-T15 cells decreased when the cells are treated with a high concentration H2O2. The insulin mRNA of the HIT-T15 cells cultured in a high concentration of ribose was lower than of those cultured in a low concentration of glucose. INS-1, HIT-T15 and rat islet cells, cultured for 72 hours, had progressively greater peroxide levels with higher concentrations of both glucose and ribose. The GSIS in the cells cultured in high concentrations of both glucose and ribose were decreased. CONCLUSION: These results suggest only one potential central mechanism for glucose toxicity in beta cells, this being the formation of excess ROS.

Role of Activation of NF- B and AP-1 by Oxidative Stress in Atherosclerosis in Diabetic Patients.: Chul Sik Kim, Geun Taek Lee, Jina Park, Min Ho Cho, Joo Young Nam, Jong Suk Park, Dol Mi Kim, Chul Woo Ahn, Bong Soo Cha, Sung Kil Lim, Kyung Rae Kim, Hyun Chul Lee; Korean Diabetes J. 2004;28(4):255-264. Published online August 1, 2004

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Abstract PDF: BACKGROUND
The aim of this study was to evaluate the possible role of NF- B activation and AP-1 by oxidative stress in atherosclerosis in diabetic patients by measuring the carotid intima-media thickness, intracellular ROS generation and activation of transcription factors, including nuclear factor-kappa B (NF- B) and activator protein-1 (AP-1). METHODS: Sixty-six patients (28 males, 38 females; age 56.1 13.4 years; duration of diabetes 115.7 83.4 months) with type 2 diabetes mellitus (DM) were selected for this study. The DM patients included in this study were divided into those with a normal carotid intima-media thickness (Group II) and those with an increased intima-media thickness (Group III). 57 healthy controls matched for age and sex with the DM patients (Group I) were randomly selected. Dichlorodifluorescein (DCF)-sensitive intracellular ROS was measured by fluorescent spectrometry. The activities of NF- B and AP-1 in PBMCs were measured by an electrophoretic mobility shift assay. RESULTS: No differences were evident between the groups in terms of gender, age, BMI, blood pressure, total cholesterol, triglyceride, LDL-cholesterol and HDL-cholesterol. Spontaneous and H2O2 (or phorbol-12-myristate-13-acetate, PMA) stimulated ROS were significantly higher in the PBMCs from the DM patients with an increased intima-media thickness (Group III) than in those without (Group II), and were also higher in the control group (Group I). Moreover, the activities of NF- B and AP-1 were significantly higher in Group III than in Groups I or II. CONCLUSION: The present study demonstrates that intracellular ROS generation, and NF- B and AP-1 activation in PBMCs strongly correlates with the carotid artery IMT. These clinical results suggest that increased oxidative stress in PBMCs may play a role in the pathogenesis of atherosclerosis in DM patients .

The Effect of alpha-lipoic Acid on Endothelial Dysfunction Induced by Intralipid Infusion in Healthy Volunteers.: Dong Wook Lee, Mi Jung Kim, Hye Soon Kim, Tae Sung Yun, Ho Chan Cho, Sang Jun Lee, Seung Ho Hur, Kyo Cheol Mun, Yong Won Cho, Jae Hoon Bae, In Kyu Lee; Korean Diabetes J. 2002;26(5):336-346. Published online October 1, 2002

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Abstract PDF: BACKGROUND
Endothelial dysfunciton has been proposed as an early manifestation of atherogenesis. Recently, emerging evidence suggests that hypertriglyceridemia and elevated free fatty acid are important risk factors in the development of atherosclerosis, probably through an increased oxidative stress. To clarify the hypothesis, we evaluated the effect of alpha-lipoic acid (ALA) on the endothelial dysfunction induced by intralipid infusion in healthy volunteers. METHODS: Hypertriglyceridemia and elevated free fatty acids was induced by infusion of intralipid. FMD (Flow-mediated dilation) of the brachial artery was investigated noninvasively by a high-resolution ultrasound technique in 13 young, healthy men without risk factors for coronary heart disease. RESULTS: Plasma triglyceride, free fatty acid and the superoxide anion were increased from 61.7+/-28.8 to 332.6+/-202.5 mg/dL, from 330.7+/-131.1 to 1267.0+/-486.2 microEq/L and from 6.6+/-2.2 to 8.7+/-1.5 X 10(-7)nmol/10(6)cells/30min (vs. basal p<0.001), respectively, following infusion of the intralipid. The FMD was decreased from 10.1+/-3.3 to 7.7+/-3.7% (vs. basal p<0.01) following infusion of the intralipid. After treatment with ALA, the increase in the FMD and the decrease in superoxide anion were significant. CONCLUSION: Acute hypertriglyceridemia, induced by intralipid infusion, is implicated in endothelial dysfunction. This endothelial dysfunction was reversed by treatment with ALA. These results suggest that chronic and repeated hypertriglyceridemia may play important roles in the development of atherosclerosis probably by increasing oxidative stress.

Effects of Hydrogen Peroxide on Insulin Secretion in Rat Pancreatic Islets.: Chul Hee Kim, Chan Hee Kim, Hyeong Kyu Park, Kyo Il Suh, Ki Up Lee; Korean Diabetes J. 2002;26(4):265-273. Published online August 1, 2002

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Abstract PDF: BACKGROUND
It has been hypothesized that reactive oxygen species (ROS) are involved in the progression of beta cell dysfunction in both type 1 and type 2 diabetes mellitus. On the other hand, recent evidence suggests that ROS might be an integral component of intracellular signaling. This study was undertaken to examine effects of hydrogen peroxide (H2O2) on insulin secretion by various secretagogues in isolated rat pancreatic islets. METHODS: Pancreatic islets from normal Sprague-Dawley rats were isolated by intraductal injection of collagenase and Ficoll-gradient centrifugation. Isolated islets were treated with H2O2 directly added to the culture media or continuously generated by glucose-glucose oxidase system for 24 hours. Insulin secretion stimulated by glucose, arginine, and KCl was measured by radioimmunoassay. RESULTS: Basal insulin secretion was increased after treatment with H2O2. Treatment with low concentration of H2O2 stimulated insulin secretion in response to 27 mM glucose. In contrast, insulin secretion stimulated by 27 mM glucose was significantly decreased after treatment with high concentrations of H2O2. Arginine- stimulated insulin secretion was increased by both low- and high concentrations of H2O2. Insulin secretion stimulated by KCl was not affected by treatment with H2O2. CONCLUSION: These results suggest that the effect of H2O2 is diverse according to its concentration and different insulin secretagogues. In particular, H2O2 has a dual action on glucose-induced insulin secretion. At low concentration, H2O2 can stimulate insulin secretion probably by acting on signaling pathway of stimulus- secretion coupling. In contrast, high concentrations of H2O2 impairs glucose- induced insulin secretion, probably by acting as an oxidative stress.

The Effect of Alpha-lipoic Acid on Endothelial Dysfunction in Postmenopausal Uncomplicated Type 2 Diabetes.: Ho Chan Cho, Sang Jun Lee, Mi Jung Kim, Hye Sun Kim, Tae Sung Yun, Sung Jae Kim, Sang Hyon Kim, Seung Ho Hur, Kyo Chul Moon, Jae Hoon Bae, In Kyu Lee; Korean Diabetes J. 2002;26(4):242-252. Published online August 1, 2002

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Abstract PDF: BACKGROUND
Recently, increased oxidative stress has been proposed as a major cause of vascular complications of patients with diabetes mellitus. Increased generation of oxygen free radicals in patients with diabetes mellitus could deplete cellular antioxidants and inactivate endothelial dependent vasodilating factor (EDRF), such as nitric oxide (NO). The purpose of this study was to evaluate whether the antioxidant alpha-lipoic acid (ALA) is effective in endothelial dysfunction of brachial artery, which induced by increased oxidative stress in postmenopausal diabetic women using high resolution ultrasound technique and initial reaction time (IRT) measurement. METHODS: We enrolled 11 menopausal women (mean age, 56.5+/-5.1 years) with uncomplicated type 2 diabetes. All patients were taking 1200 mg of ALA (Thioctacid(R), Bukwang, Korea). We measured of superoxide anion (O2-) in neutrophils as a marker of oxidative stress. Flow-mediated dilation (FMD) was measured using a high-resolution ultrasound. RESULTS: After treatment of ALA, fasting blood glucose was decreased significantly, the endothelium-dependent vasodilation of the brachial artery was increased, and O2- production was also decreased significantly. CONCLUSION: These results show that short term ALA treatment could improve the endothelial dysfunction in patients with type 2 diabetes mellitus. This improvement might be related with the antioxidants effect of ALA.

The Effect of alpha-Lipoic Acid on Vascular Smooth Muscle Cell Proliferation, Migration, Neointimal Formation and PAI-1 Expression.: Dong Woo Shin, Dong Wook Lee, Sang Jun Lee, Hye Soon Kim, Hyo Gyoung Kang, Jong Deok Ahn, In Kyu Lee; Korean Diabetes J. 2001;25(6):446-459. Published online December 1, 2001

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Abstract PDF: BACKGROUND
Exposure to large amounts of glucose causes a characteristic dysfunction and morphologic changes of the endothelium by an increased production of reactive oxygen species (ROS) in diabetes. The plasminogen activator inhibitor-1 (PAI-1), which modulates fibrinolysis and cell migration, may influence proteolysis and neointimal formation in vascular smooth muscle cells (VSMC). Antioxidants have been proposed to inhibit multiple proatherogenic events. This study investigated the effect of (alpha)-Lipoic acid on PAI-1 expression and VSMC proliferation and migration both in vivo and in vitro. METHODS: In the in vitro study, cultured rat aortic smooth muscle cells (RASMC) were incubated in a medium containing high glucose (22 mM) and 100 nM angiotensin II for 4 hour. After (alpha)-Lipoic acidtreatment, a -migration and growth assay of the RASMC, and a gel mobility shift assay and reporter gene analysis for nuclear factor- B (NF-kappa B) and northern blot analysis for PAI-1 were performed. In the in vivo study, the effect of (alpha)-Lipoic acid on neointimal hyperplasia in a rat carotid balloon injury model was evaluated. RESULTS: RASMC migration was inhibited significantly by (alpha)-Lipoic acid (p<0.01), but their proliferation was not inhibited. The NF-kappa B DNA binding activity and NF-kappa B promoter activity was inhibited by (alpha)-Lipoic acid significantly (p<0.01). (alpha)-Lipoic acid inhibited PAI-1 mRNA expression by high glucose and angiotensin II in dose dependent manner (p<0.05). In the rat carotid artery balloon injury model, neointimal formation was reduced by (alpha)-Lipoic acid treatment in a dose dependent manner significantly (p<0.01). CONCLUSION: (alpha)-Lipoic acid suppresses migration, but not proliferation in RASMC. (alpha)-Lipoic acid also reduce neointima formation in a rat carotid balloon injured model. This effect might be related to the blocking of NF-kappa B which increase the expression of the genes associated with atherosclerosis including TNF-alpha, IL-1, IL-6, endothelin-1, MCP-1, VCAM-1, ICAM-1, E-selectin, tissue factor.

Oxidative Stress and Antioxidative Defense System in Offspring of Protein-Malnourished Rats.: Eun Young Cho, Hyeong Kyu Park, Hyeon Jeong Jeon, Suk Kyeong Kim, Kyong Soo Park, Chong Ho Lee, Seong Yeon Kim, Hong Kyu Lee; Korean Diabetes J. 2001;25(3):190-199. Published online June 1, 2001

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Abstract PDF: BACKGROUND
Free radical-mediated oxidative damage has been implicated in a variety of pathological processes such as diabetes mellitus, aging and atherosclerosis. The susceptibility of a given organism to oxidative damage is influenced by the overall balance between the degree of oxidative stress and antioxidative capabilities. Nutrition plays an important role in determining the cellular antioxidative defense mechanism. Thus, the aim of this study is to investigate the effects of fetal protein malnutrition on oxidative stress and antioxidative capabilities. METHOD: Rats were fed a low-protein (8% casein) diet throughout pregnancy and lactation. Male offspring were weaned onto either a control (18% casein) diet (group 2) or a low-protein diet (group 3). Offspring from rats fed a control diet were weaned onto a control diet (group 1). The activities of superoxide dismutase (SOD), glutathione peroxidase (GPx) and the concentration of thiobarbituric acid- reactive substances (TBARS) were determined at 10 and 15 wk in liver and skeletal muscle from offspring. RESULTS: SOD activities of liver in group 3 were significantly lower than those in group 1 at 10 wk (4.14+/-0.65 U/mg protein, 9.09+/-0.85 U/mg protein) and 15 wk (4.18+/-0.58 U/mg protein, 7.63+/-0.74 U/mg protein), respectively. But SOD activities of skeletal muscle were not different between groups. Whilst GPx activities of liver were not different at 10 wk, GPx activities in group 2 (1.80+/-0.16 U/mg protein) were significant higher than those in group 1 (1.24+/-0.15 U/mg protein) at 15 wk. GPx activities of skeletal muscle were not different between groups. The TBARS concentrations in liver or skeletal muscle were not different between groups at 10 and 15 wk. There was a significant negative correlation between SOD activities and TBARS concentrations in liver (r=-0.359). CONCLUSION: In offspring of rats fed a low-protein diet throughout pregnancy and lactation, the antioxidant enzyme activities were significantly decreased, compared with offspring of rats fed a control diet. These alterations were not fully restored in low-protein offspring even when weaned onto a control diet. These results suggest that fetal protein malnutrition impair the antioxidative defense system.

The Oxidative Stress and the Antioxidant System in Type 2 Diabetics with Complications.: Ae Wha Ha, Hye Lim Noh, Yoon Sok Chung, Kawn Woo Lee, Hyeon Man Kim, Jung Soon Cho; Korean Diabetes J. 1998;22(3):253-261. Published online January 1, 2001

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Abstract PDF: BACKGROUND
Diabetes mellitus represents a state of increased oxidative stress which is based on the evidence of increased peroxidation and glycosylation, and reduced antioxidant system. It has been suggested that increased oxidative stress may play an important role on the pathogenesis of diabetic complication in type 2 diabetes. However, limited informations regarding the oxidative stress and antioxidant system in diabetic complications are available. Therefore the purpose of this study is to determine the oxidative stress and antioxidant system in type 2 diabetes with diabetic complications. METHODS: The study population consisted of 94 type 2 diabetic patients and 44 normal subjects. The concentration of thiobarbituric acid reactive substance(TBA-RS) and the activities of antioxidants enzymes, catalase, superoxide dismutase(SOD), glutathione peroxidase(GSH-Px) in erythrocyte were detennined by using spectrophotometer. The plasma concantrations of b-carotene, lycopene, lutein, a-tocopherol and retinol were determined by using HPLC. RESULTS: The TBA-RS concentrations in type 2 diabetes(1.33+0.30nmol/mL) were significantly higher than those in normal subjects(1.10+0.17nmol/ mL). Also the TBA-RS concentrations between subjects with complications(1.37+0.27nmol/mL) and without complications(1.28+0.17nmol/mL) differed (p<0.05). The activities of SOD and GSH-Px in type 2 diabetes(2.99+0.80U/mgHb, 2.88+0.39U/ mgHb) were significantly lower than those in normal subjects(3.54+0.44U/mgHb, 3.14+0.39U/mgHb). GSH-Px between diabetics with(2.81+0.6U/mgHb) and without complications(3.17+0.4U/mgHb) differed significantly. The plasma concentrations of lycopene and b-carotene were significantly lower in type 2 diabetes(0.07+0.05umol/L, 0.54+0.27umol/L) than in control subjects(0.14+0.06umol/L, 0.67+0.32umol/L). Also, lycopene and b-carotene in subjects with complications(0.05+0.04umol/L, 0.45+0.23umol/L) were lower than in subjects without complications(0.08+0.05umol/L, 0.62+0.30umol/L). No significant differences in plasma a-tocopherol concentrations between subjects with and without complications(19.42+0.93umol/L vs 18.66+ 0.79umoll/L). CONCLUSION: This study showed that in diabetes with diabetic complications, the lipid peroxidation of erythrocytes are highly increased and the antioxidant reserves are significmtly depleted, compared with diabetes without diabetic complications, which suggests that diabetes with complications are under high oxidative stress and the supplementations of carotenoids could decrease the oxidative stress in diabetes with diabetic complications.

The Effect of Acute Hyperglycemia on Endothelial Function in Type 2 Diabetes.: Sang Jun Lee, Dong Wook Lee, In Kyu Lee; Korean Diabetes J. 2000;24(5):574-586. Published online January 1, 2001

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Abstract: BACKGROUND
Multiple studies in patients with diabetes demonstrate impaired endothelial-dependent vasodilation. But the mechanisms of vascular dysfunction in type 2 diabetes are still controversial. Some risk factors, such as dyslipidemia, hypertension and obesity, are commonly associated with type 2 diabetes. These risk factor may cause endothelial dysfunction. And hyperglycemia may have a specific role in the increased risk of vascular complications in diabetes but it remains unclear. The purpose of this study was to examine whether endothelial dysfunction occurs when acute hyperglycemia is induced by oral glucose loading. METHOD: Using the high-resolution ultrasound, we measured flow-mediated vasodilation (endothelial dependent vasodilation: FMD) during oral glucose tolerance test in 11 men (mean age: 59+/-5 years) with type 2 diabetes without chronic diabetic complications. For statistical analysis, we used paired t-test, generalized linear method (GLM) to compare FMD before and after glucose loading. RESULT: Flow-mediated vasodilation was diminished after glucose loading (13.2+/- 6.4%, 7.3+/-3.3*%, 12.8+/-5.6%, in fasting, at 1- and 2-h, respectively; *p<0.001 vs fasting). Superoxide anion formation by neutrophils was increased after glucose loading (4.65+/-2.8, 6.17+/-2.2, in fasting, at 1-h respectively: p<0.05 vs fasting)( 10-7nmol/106cells/30min). Endothelial independent vasodilation was not significantly affected by glucose loading. The concentration of triglyceride were not changed after glucose loading. CONCLUSION: This study shows that acute hyperglycemia induced by 75 gm oral glucose intake results in endothelial dysfunction. These results suggest that prolonged and repeated hyperglycemia may play an important role in the developement and progression of vascular complication in diabetes.

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