Diabetes & Metabolism Journal

Original Articles

Others
Clinical Trial Protocol for Porcine Islet Xenotransplantation in South Korea: Byung-Joon Kim, Jun-Seop Shin, Byoung-Hoon Min, Jong-Min Kim, Chung-Gyu Park, Hee-Jung Kang, Eung Soo Hwang, Won-Woo Lee, Jung-Sik Kim, Hyun Je Kim, Iov Kwon, Jae Sung Kim, Geun Soo Kim, Joonho Moon, Du Yeon Shin, Bumrae Cho, Heung-Mo Yang, Sung Joo Kim, Kwang-Won Kim; Diabetes Metab J. 2024;48(6):1160-1168. Published online May 21, 2024; DOI: https://doi.org/10.4093/dmj.2023.0260

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Abstract PDF Supplementary Material PubReader ePub: Background
Islet transplantation holds promise for treating selected type 1 diabetes mellitus patients, yet the scarcity of human donor organs impedes widespread adoption. Porcine islets, deemed a viable alternative, recently demonstrated successful longterm survival without zoonotic risks in a clinically relevant pig-to-non-human primate islet transplantation model. This success prompted the development of a clinical trial protocol for porcine islet xenotransplantation in humans.
Methods
A single-center, open-label clinical trial initiated by the sponsor will assess the safety and efficacy of porcine islet transplantation for diabetes patients at Gachon Hospital. The protocol received approval from the Gachon Hospital Institutional Review Board (IRB) and the Korean Ministry of Food and Drug Safety (MFDS) under the Investigational New Drug (IND) process. Two diabetic patients, experiencing inadequate glycemic control despite intensive insulin treatment and frequent hypoglycemic unawareness, will be enrolled. Participants and their family members will engage in deliberation before xenotransplantation during the screening period. Each patient will receive islets isolated from designated pathogen-free pigs. Immunosuppressants and systemic infection prophylaxis will follow the program schedule. The primary endpoint is to confirm the safety of porcine islets in patients, and the secondary endpoint is to assess whether porcine islets can reduce insulin dose and the frequency of hypoglycemic unawareness.
Conclusion
A clinical trial protocol adhering to global consensus guidelines for porcine islet xenotransplantation is presented, facilitating streamlined implementation of comparable human trials worldwide.

Basic Research
Glucolipotoxicity Suppressed Autophagy and Insulin Contents in Human Islets, and Attenuation of PERK Activity Enhanced Them in an ATG7-Dependent Manner: Seoil Moon, Ji Yoon Lim, Mirang Lee, Youngmin Han, Hongbeom Kim, Wooil Kwon, Jin-Young Jang, Mi Na Kim, Kyong Soo Park, Hye Seung Jung; Diabetes Metab J. 2024;48(2):231-241. Published online September 6, 2023; DOI: https://doi.org/10.4093/dmj.2022.0366

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Background
Administration of pancreatic endoplasmic reticulum kinase inhibitor (PERKi) improved insulin secretion and hyperglycemia in obese diabetic mice. In this study, autophagic balance was studied whether to mediate it.
Methods
Human islets were isolated from living patients without diabetes. PERKi GSK2606414 effects were evaluated in the islets under glucolipotoxicity by palmitate. Islet insulin contents and secretion were measured. Autophagic flux was assessed by microtubule associated protein 1 light chain 3 (LC3) conversion, a red fluorescent protein (RFP)-green fluorescent protein (GFP)- LC3 tandem assay, and P62 levels. For mechanical analyses, autophagy was suppressed using 3-methyladenine in mouse islets. Small interfering RNA for an autophagy-related gene autophagy related 7 (Atg7) was transfected to interfere autophagy.
Results
PERKi administration to mice decreased diabetes-induced P62 levels in the islets. Glucolipotoxicity significantly increased PERK phosphorylation by 70% and decreased insulin contents by 50% in human islets, and addition of PERKi (40 to 80 nM) recovered both. PERKi also enhanced glucose-stimulated insulin secretion (6-fold). PERKi up-regulated LC3 conversion suppressed by glucolipotoxicity, and down-regulated P62 contents without changes in P62 transcription, indicating enhanced autophagic flux. Increased autophagosome-lysosome fusion by PERKi was visualized in mouse islets, where PERKi enhanced ATG7 bound to LC3. Suppression of Atg7 eliminated PERKi-induced insulin contents and secretion.
Conclusion
This study provided functional changes of human islets with regard to autophagy under glucolipotoxicity, and suggested modulation of autophagy as an anti-diabetic mechanism of PERKi.

Citations

Citations to this article as recorded by

Genetic knock-in of EIF2AK3 variants reveals differences in PERK activity in mouse liver and pancreas under endoplasmic reticulum stress
Shivesh Ghura, Noah R. Beratan, Xinglong Shi, Elena Alvarez-Periel, Sarah E. Bond Newton, Cagla Akay-Espinoza, Kelly L. Jordan-Sciutto
Scientific Reports.2024;[Epub] CrossRef
Pancreatic β-Cells, Diabetes and Autophagy
Yang Ou, Yan-Li Zhao, Heng Su
Endocrine Research.2024; : 1. CrossRef

Review

Basic Research
Rediscovering Primary Cilia in Pancreatic Islets: Eun Young Lee, Jing W. Hughes; Diabetes Metab J. 2023;47(4):454-469. Published online April 28, 2023; DOI: https://doi.org/10.4093/dmj.2022.0442

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Primary cilia are microtubule-based sensory and signaling organelles on the surfaces of most eukaryotic cells. Despite their early description by microscopy studies, islet cilia had not been examined in the functional context until recent decades. In pancreatic islets as in other tissues, primary cilia facilitate crucial developmental and signaling pathways in response to extracellular stimuli. Many human developmental and genetic disorders are associated with ciliary dysfunction, some manifesting as obesity and diabetes. Understanding the basis for metabolic diseases in human ciliopathies has been aided by close examination of cilia action in pancreatic islets at cellular and molecular levels. In this article, we review the evidence for ciliary expression on islet cells, known roles of cilia in pancreas development and islet hormone secretion, and summarize metabolic manifestations of human ciliopathy syndromes. We discuss emerging data on primary cilia regulation of islet cell signaling and the structural basis of cilia-mediated cell crosstalk, and offer our interpretation on the role of cilia in glucose homeostasis and human diseases.

Citations

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ciBAR1 loss in mice causes laterality defects, pancreatic degeneration, and altered glucose tolerance
Eunice N Kim, Feng-Qian Li, Ken-Ichi Takemaru
Life Science Alliance.2025; 8(2): e202402916. CrossRef
Genome-wide association study and trans-ethnic meta-analysis identify novel susceptibility loci for type 2 diabetes mellitus
Asma A Elashi, Salman M Toor, Umm-Kulthum Ismail Umlai, Yasser A Al-Sarraj, Shahrad Taheri, Karsten Suhre, Abdul Badi Abou-Samra, Omar M E Albagha
BMC Medical Genomics.2024;[Epub] CrossRef
Reduced Nephrin Tyrosine Phosphorylation Enhances Insulin Secretion and Increases Glucose Tolerance With Age
Casey R Williamson, Nina Jones
Endocrinology.2024;[Epub] CrossRef
Beta-Hydroxybutyrate Promotes Basal Insulin Secretion While Decreasing Glucagon Secretion in Mouse and Human Islets
Risha Banerjee, Ying Zhu, George P Brownrigg, Renata Moravcova, Jason C Rogalski, Leonard J Foster, James D Johnson, Jelena Kolic
Endocrinology.2024;[Epub] CrossRef
Intestinal flora: a potential pathogenesis mechanism and treatment strategy for type 1 diabetes mellitus
Shengnan Huang, Fangfang Li, Chunhua Quan, Dan Jin
Gut Microbes.2024;[Epub] CrossRef
Molecular mechanisms of the obesity associated with Bardet‐Biedl syndrome: An update
Bang‐Hua Zhong, Ning Nie, Ming Dong
Obesity Reviews.2024;[Epub] CrossRef
Beta cell primary cilia mediate somatostatin responsiveness via SSTR3
Samantha E. Adamson, Zipeng A. Li, Jing W. Hughes
Islets.2023;[Epub] CrossRef

Original Articles

Basic Research
Differentiation of Microencapsulated Neonatal Porcine Pancreatic Cell Clusters in Vitro Improves Transplant Efficacy in Type 1 Diabetes Mellitus Mice: Gyeong-Jin Cheon, Heon-Seok Park, Eun-Young Lee, Min Jung Kim, Young-Hye You, Marie Rhee, Ji-Won Kim, Kun-Ho Yoon; Diabetes Metab J. 2022;46(5):677-688. Published online February 7, 2022; DOI: https://doi.org/10.4093/dmj.2021.0202

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Background
Neonatal porcine pancreatic cell clusters (NPCCs) have been proposed as an alternative source of β cells for islet transplantation because of their low cost and growth potential after transplantation. However, the delayed glucose lowering effect due to the immaturity of NPCCs and immunologic rejection remain as a barrier to NPCC’s clinical application. Here, we demonstrate accelerated differentiation and immune-tolerant NPCCs by in vitro chemical treatment and microencapsulation.
Methods
NPCCs isolated from 3-day-old piglets were cultured in F-10 media and then microencapsulated with alginate on day 5. Differentiation of NPCCs is facilitated by media supplemented with activin receptor-like kinase 5 inhibitor II, triiodothyronine and exendin-4 for 2 weeks. Marginal number of microencapsulated NPCCs to cure diabetes with and without differentiation were transplanted into diabetic mice and observed for 8 weeks.
Results
The proportion of insulin-positive cells and insulin mRNA levels of NPCCs were significantly increased in vitro in the differentiated group compared with the undifferentiated group. Blood glucose levels decreased eventually after transplantation of microencapsulated NPCCs in diabetic mice and normalized after 7 weeks in the differentiated group. In addition, the differentiated group showed nearly normal glucose tolerance at 8 weeks after transplantation. In contrast, neither blood glucose levels nor glucose tolerance were improved in the undifferentiated group. Retrieved graft in the differentiated group showed greater insulin response to high glucose compared with the undifferentiated group.
Conclusion
in vitro differentiation of microencapsulated immature NPCCs increased the proportion of insulin-positive cells and improved transplant efficacy in diabetic mice without immune rejection.

Citations

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Dual-targeted nano-encapsulation of neonatal porcine islet-like cell clusters with triiodothyronine-loaded bifunctional polymersomes
Sang Hoon Lee, Minse Kim, Eun-Jin Lee, Sun Mi Ahn, Yu-Rim Ahn, Jaewon Choi, Jung-Taek Kang, Hyun-Ouk Kim
Discover Nano.2024;[Epub] CrossRef
Long‐term efficacy of encapsulated xenogeneic islet transplantation: Impact of encapsulation techniques and donor genetic traits
Heon‐Seok Park, Eun Young Lee, Young‐Hye You, Marie Rhee, Jong‐Min Kim, Seong‐Soo Hwang, Poong‐Yeon Lee
Journal of Diabetes Investigation.2024; 15(6): 693. CrossRef

Pathophysiology
Relationships between Islet-Specific Autoantibody Titers and the Clinical Characteristics of Patients with Diabetes Mellitus: Yiqian Zhang, Tong Yin, Xinlei Wang, Rongping Zhang, Jie Yuan, Yi Sun, Jing Zong, Shiwei Cui, Yunjuan Gu; Diabetes Metab J. 2021;45(3):404-416. Published online July 21, 2020; DOI: https://doi.org/10.4093/dmj.2019.0239

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Background

Dysimmunity plays a key role in diabetes, especially type 1 diabetes mellitus. Islet-specific autoantibodies (ISAs) have been used as diagnostic markers for different phenotypic classifications of diabetes. This study was aimed to explore the relationships between ISA titers and the clinical characteristics of diabetic patients.

Methods

A total of 509 diabetic patients admitted to Department of Endocrinology and Metabolism at the Affiliated Hospital of Nantong University were recruited. Anthropometric parameters, serum biochemical index, glycosylated hemoglobin, urinary microalbumin/creatinine ratio, ISAs, fat mass, and islet β-cell function were measured. Multiple linear regression analysis was performed to identify relationships between ISA titers and clinical characteristics.

Results

Compared with autoantibody negative group, blood pressure, weight, total cholesterol (TC), low density lipoprotein cholesterol (LDL-C), visceral fat mass, fasting C-peptide (FCP), 120 minutes C-peptide (120minCP) and area under C-peptide curve (AUC_CP) of patients in either autoantibody positive or glutamate decarboxylase antibody (GADA) positive group were lower. Body mass index (BMI), waist circumference, triglycerides (TGs), body fat mass of patients in either autoantibody positive group were lower than autoantibody negative group. GADA titer negatively correlated with TC, LDL-C, FCP, 120minCP, and AUC_CP. The islet cell antibody and insulin autoantibody titers both negatively correlated with body weight, BMI, TC, TG, and LDL-C. After adjusting confounders, multiple linear regression analysis showed that LDL-C and FCP negatively correlated with GADA titer.

Conclusion

Diabetic patients with a high ISA titer, especially GADA titer, have worse islet β-cell function, but less abdominal obesity and fewer features of the metabolic syndrome.

Citations

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Relationship between β-Cell Autoantibodies and Their Combination with Anthropometric and Metabolic Components and Microvascular Complications in Latent Autoimmune Diabetes in Adults
Tomislav Bulum, Marijana Vučić Lovrenčić, Jadranka Knežević Ćuća, Martina Tomić, Sandra Vučković-Rebrina, Lea Duvnjak
Biomedicines.2023; 11(9): 2561. CrossRef
RETRACTED ARTICLE: MiRNA-27a mediates insulin resistance in 3T3-L1 cells through the PPARγ
Yangming Zhuang, Ming Li
Molecular and Cellular Biochemistry.2022; 477(4): 1107. CrossRef
Correlation between Insulin Resistance and Microalbuminuria Creatinine Ratio in Postmenopausal Women
Han Na, Rong Wang, Hai-Long Zheng, Xiao-Pan Chen, Lin-Yang Zheng, Faustino R. Perez-Lopez
International Journal of Endocrinology.2022; 2022: 1. CrossRef
The longitudinal loss of islet autoantibody responses from diagnosis of type 1 diabetes occurs progressively over follow-up and is determined by low autoantibody titres, early-onset, and genetic variants
C L Williams, R Fareed, G L M Mortimer, R J Aitken, I V Wilson, G George, K M Gillespie, A J K Williams, Chitrabhanu Ballav, Atanu Dutta, Michelle Russell-Taylor, Rachel Besser, James Bursell, Shanthi Chandran, Sejal Patel, Anne Smith, Manohara Kenchaiah,
Clinical and Experimental Immunology.2022; 210(2): 151. CrossRef

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.

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Effects of hypoxia in the diabetic corneal stroma microenvironment
Purnima Sharma, Jian-Xing Ma, Dimitrios Karamichos
Experimental Eye Research.2024; 240: 109790. CrossRef
High‐resolution magic angle spinning nuclear magnetic resonance of donor pancreatic tissue may predict islet viability prior to isolation
Carolyn M. Slupsky, Brian D. Sykes, Jonathan R. T. Lakey
NMR in Biomedicine.2024;[Epub] CrossRef
Nanomedicine regulating PSC-mediated intercellular crosstalk: Mechanisms and therapeutic strategies
Hui Wang, Liang Qi, Han Han, Xuena Li, Mengmeng Han, Lei Xing, Ling Li, Hulin Jiang
Acta Pharmaceutica Sinica B.2024;[Epub] CrossRef
Visualizing hypoxic modulation of beta cell secretions via a sensor augmented oxygen gradient
Kai Duan, Mengyang Zhou, Yong Wang, Jose Oberholzer, Joe F. Lo
Microsystems & Nanoengineering.2023;[Epub] CrossRef
Pancreatic stellate cells promote pancreatic β-cell death through exosomal microRNA transfer in hypoxia
Esder Lee, Gyeong Ryul Ryu, Seung-Hyun Ko, Yu-Bae Ahn, Ki-Ho Song
Molecular and Cellular Endocrinology.2023; 572: 111947. CrossRef
Pancreatic stellate cells in pancreatic cancer: as potential targets for future therapy
Zhengfeng Wang, Ru He, Shi Dong, Wence Zhou
Frontiers in Oncology.2023;[Epub] CrossRef
Recent advances in the development of bioartificial pancreas using 3D bioprinting for the treatment of type 1 diabetes: a review
Anushikha Ghosh, Arka Sanyal, Abhik Mallick
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Pancreas and islet morphology in cystic fibrosis: clues to the etiology of cystic fibrosis-related diabetes
Sarah S. Malik, Diksha Padmanabhan, Rebecca L. Hull-Meichle
Frontiers in Endocrinology.2023;[Epub] CrossRef
Diabetic mellitus, vascular calcification and hypoxia: A complex and neglected tripartite relationship
Xue-Jiao Sun, Nai-Feng Liu
Cellular Signalling.2022; 91: 110219. CrossRef
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Shin Hamada, Ryotaro Matsumoto, Atsushi Masamune
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Pancreatic Stellate Cells and Metabolic Alteration: Physiology and Pathophysiology
Shin Hamada, Ryotaro Matsumoto, Atsushi Masamune
Frontiers in Physiology.2022;[Epub] CrossRef
Exosomal miR-140–3p and miR-143–3p from TGF-β1-treated pancreatic stellate cells target BCL2 mRNA to increase β-cell apoptosis
Xiangyun Zhu, Dechen Liu, Guoqing Li, Mengmeng Zhi, Ji Sun, Liang Qi, Jingbo Li, Stephen J. Pandol, Ling Li
Molecular and Cellular Endocrinology.2022; 551: 111653. CrossRef
Mitochondria oxidative stress mediated nicotine-promoted activation of pancreatic stellate cells by regulating mitochondrial dynamics
Yue Yuan, Zhiren Li, Miaomiao Li, Tong Jin, Xiaoyun Zhang, Xinjuan Liu, Jianyu Hao
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Diabetic Ferroptosis and Pancreatic Cancer: Foe or Friend?
Le Li, Xing-jia Yu, Lei Gao, Long Cheng, Bei Sun, Gang Wang
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Melatonin Induces Apoptosis and Modulates Cyclin Expression and MAPK Phosphorylation in Pancreatic Stellate Cells Subjected to Hypoxia
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Yuan Li, Bingwei Li, Bing Wang, Mingming Liu, Xiaoyan Zhang, Ailing Li, Jian Zhang, Honggang Zhang, Ruijuan Xiu
Microcirculation.2021;[Epub] CrossRef
Pancreatic stellate cells - rising stars in pancreatic pathologies
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Physiological Research.2021; (S4): S597. CrossRef

Brief Report

Basic Research
A Novel Pancreatic Imaging Window for Stabilized Longitudinal In Vivo Observation of Pancreatic Islets in Murine Model: Inwon Park, Sujung Hong, Yoonha Hwang, Pilhan Kim; Diabetes Metab J. 2020;44(1):193-198. Published online May 29, 2019; DOI: https://doi.org/10.4093/dmj.2018.0268

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Longitudinal imaging of murine pancreas is technically challenging due to the mechanical softness of the tissue influenced by peristalsis. Here, we report a novel pancreatic imaging window for long-term stabilized cellular-level observation of the islets in the pancreas in vivo. By spatially separating the pancreas from the bowel movement and physiologic respiration with a metal plate integrated in the imaging window, we successfully tracked the pancreatic islets up to three weeks and visualized the dumbbell-shape transformation from the single islet. This window can be a useful tool for long-term cellular-level visualization of the microstructure in the pancreas.

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Cindy V. Bui, Curtis W. Boswell, Brian Ciruna, Jonathan V. Rocheleau
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Intravital imaging of the functions of immune cells in the tumor microenvironment during immunotherapy
Xuwen Peng, Yuke Wang, Jie Zhang, Zhihong Zhang, Shuhong Qi
Frontiers in Immunology.2023;[Epub] CrossRef
Minimizing Motion Artifacts in Intravital Microscopy Using the Sedative Effect of Dexmedetomidine
Youngkyu Kim, Minju Cho, Bjorn Paulson, Sung-Hoon Kim, Jun Ki Kim
Microscopy and Microanalysis.2022; 28(5): 1679. CrossRef
SWIP—a stabilized window for intravital imaging of the murine pancreas
Wei Du, Christian Adkisson, Xianjun Ye, Camille L. Duran, Benson Chellakkan Selvanesan, Claudia Gravekamp, Maja H. Oktay, John C. McAuliffe, John S. Condeelis, Nicole C. Panarelli, Robert J. Norgard, Yogev Sela, Ben Z. Stanger, David Entenberg
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Intravital longitudinal cellular visualization of oral mucosa in a murine model based on rotatory side-view confocal endomicroscopy
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The Eye as a Transplantation Site to Monitor Pancreatic Islet Cell Plasticity
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Longitudinal Intravital Imaging of Tumor-Infiltrating Lymphocyte Motility in Breast Cancer Models
Inwon Park, Sujung Hong, Joon Seok, Stephani Edwina Lucia, Eunjoo Song, Mingyo Kim, Eunji Kong, Howon Seo, Yoonha Hwang, Soyeon Ahn, Seonghye Kim, Dong-Hyun Jang, Jae Hyuk Lee, Su-Hyung Park, Pilhan Kim, You Hwan Jo
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Intravital longitudinal imaging of hepatic lipid droplet accumulation in a murine model for nonalcoholic fatty liver disease
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Original Article

Pathophysiology
Essential Role of Protein Arginine Methyltransferase 1 in Pancreas Development by Regulating Protein Stability of Neurogenin 3: Kanghoon Lee, Hyunki Kim, Joonyub Lee, Chang-Myung Oh, Heein Song, Hyeongseok Kim, Seung-Hoi Koo, Junguee Lee, Ajin Lim, Hail Kim; Diabetes Metab J. 2019;43(5):649-658. Published online April 8, 2019; DOI: https://doi.org/10.4093/dmj.2018.0232

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Background

Protein arginine methyltransferase 1 (PRMT1) is a major enzyme responsible for the formation of methylarginine in mammalian cells. Recent studies have revealed that PRMT1 plays important roles in the development of various tissues. However, its role in pancreas development has not yet been elucidated.

Methods

Pancreatic progenitor cell-specific Prmt1 knock-out (Prmt1 PKO) mice were generated and characterized for their metabolic and histological phenotypes and their levels of Neurog3 gene expression and neurogenin 3 (NGN3) protein expression. Protein degradation assays were performed in mPAC cells.

Results

Prmt1 PKO mice showed growth retardation and a severely diabetic phenotype. The pancreatic size and β-cell mass were significantly reduced in Prmt1 PKO mice. Proliferation of progenitor cells during the secondary transition was decreased and endocrine cell differentiation was impaired. These defects in pancreas development could be attributed to the sustained expression of NGN3 in progenitor cells. Protein degradation assays in mPAC cells revealed that PRMT1 was required for the rapid degradation of NGN3.

Conclusion

PRMT1 critically contributes to pancreas development by destabilizing the NGN3 protein.

Citations

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Protein arginine methyltransferase 1 regulates mouse enteroendocrine cell development and homeostasis
Zhaoyi Peng, Lingyu Bao, James Iben, Shouhong Wang, Bingyin Shi, Yun-Bo Shi
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Role of protein arginine methyltransferase 1 in obesity‐related metabolic disorders: Research progress and implications
Xiaolei Xuan, Yongjiao Zhang, Yufan Song, Bingyang Zhang, Junjun Liu, Dong Liu, Sumei Lu
Diabetes, Obesity and Metabolism.2024; 26(9): 3491. CrossRef
Protein Arginine Methyltransferases: Emerging Targets in Cardiovascular and Metabolic Disease
Yan Zhang, Shibo Wei, Eun-Ju Jin, Yunju Jo, Chang-Myung Oh, Gyu-Un Bae, Jong-Sun Kang, Dongryeol Ryu
Diabetes & Metabolism Journal.2024; 48(4): 487. CrossRef
Arginine 65 methylation of Neurogenin 3 by PRMT1 is required for pancreatic endocrine development of hESCs
Gahyang Cho, Kwangbeom Hyun, Jieun Choi, Eunji Shin, Bumsoo Kim, Hail Kim, Jaehoon Kim, Yong-Mahn Han
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Protein arginine methyltransferase 1 in the generation of immune megakaryocytes: A perspective review
Xinyang Zhao, Zechen Chong, Yabing Chen, X. Long Zheng, Qian-Fei Wang, Yueying Li
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Arginine 65 Methylation of Neurogenin 3 by PRMT1 Is Required for Pancreatic Endocrine Development of hESCs
Gahyang Cho, Kwangbeom Hyun, Jieun Choi, Eun Ji Shin, Bumsoo Kim, Hail Kim, Jaehoon Kim, Yong-Mahn Han
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Protein Arginine Methyltransferase 1 Is Essential for the Meiosis of Male Germ Cells
Sahar Waseem, Sudeep Kumar, Kanghoon Lee, Byoung-Ha Yoon, Mirang Kim, Hail Kim, Keesook Lee
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Frontiers in Cell and Developmental Biology.2020;[Epub] CrossRef

Short Communication

Islet Studies and Transplantation
Alginate-Catechol Cross-Linking Interferes with Insulin Secretion Capacity in Isolated Murine Islet Cells: Yu-Sik Kim, Seung-Woo Cho, Bomin Ko, Jisoo Shin, Chul Woo Ahn; Diabetes Metab J. 2018;42(2):164-168. Published online March 28, 2018; DOI: https://doi.org/10.4093/dmj.2018.42.2.164

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Over the past three decades, human pancreatic islet isolation and transplantation techniques have developed as a routine clinical procedure for selected patients with type 1 diabetes mellitus. However, due to the donor shortage and required chronic systemic immunosuppression, the widespread application of islet transplantation is limited. To overcome these limitations, providing a physical barrier to transplanted islet cells with encapsulating biomaterial has emerged as a promising approach to enhance engraftment and promote islet survival post-transplantation. Alginate has been considered to be a reliable biomaterial, as it enhances islet survival and does not hamper hormone secretion. Alginate-catechol (Al-CA) hydrogel was reported to provide high mechanical strength and chemical stability without deformation over a wide range of pH values. In this study, we, demonstrated, for the first time in the literature, that encapsulation of murine pancreatic islet cells with Al-CA hydrogel does not induce cytotoxicity ex vivo for an extended period; however, it does markedly abate glucose-stimulated insulin secretion. Catechol should not be considered as a constituent for alginate gelation for encapsulating islet cells in the application of islet transplantation.

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Mussel-inspired chitosan and its applications in the biomedical field
Di Zhao, Yizhuo Wang, Peiran Yu, Yanxiang Kang, Zuobing Xiao, Yunwei Niu, Yamei Wang
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Original Article

Balsamic Vinegar Improves High Fat-Induced Beta Cell Dysfunction via Beta Cell ABCA1: Hannah Seok, Ji Young Lee, Eun Mi Park, Se Eun Park, Jae Hyuk Lee, Seungtaek Lim, Byung-Wan Lee, Eun Seok Kang, Hyun Chul Lee, Bong Soo Cha; Diabetes Metab J. 2012;36(4):275-279. Published online August 20, 2012; DOI: https://doi.org/10.4093/dmj.2012.36.4.275

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Background

The aim of this study was to investigate the effects of balsamic vinegar on β-cell dysfunction.

Methods

In this study, 28-week-old Otsuka Long-Evans Tokushima Fatty (OLETF) rats were fed a normal chow diet or a high-fat diet (HFD) and were provided with tap water or dilute balsamic vinegar for 4 weeks. Oral glucose tolerance tests and histopathological analyses were performed thereafter.

Results

In rats fed both the both chow diet and the HFD, the rats given balsamic vinegar showed increased insulin staining in islets compared with tap water administered rats. Balsamic vinegar administration also increased β-cell ATP-binding cassette transporter subfamily A member 1 (ABCA1) expression in islets and decreased cholesterol levels.

Conclusion

These findings provide the first evidence for an anti-diabetic effect of balsamic vinegar through improvement of β-cell function via increasing β-cell ABCA1 expression.

Citations

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Vinegar – a beneficial food additive: production, safety, possibilities, and applications from ancient to modern times
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Reviews

Challenges in Diagnosing Type 1 Diabetes in Different Populations: Marian Rewers; Diabetes Metab J. 2012;36(2):90-97. Published online April 17, 2012; DOI: https://doi.org/10.4093/dmj.2012.36.2.90

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Diabetes affects today an estimated 366 million people world-wide, including 20 million to 40 million of patients with type 1 diabetes (T1D). While T1D accounts for 5% to 20% of those with diabetes, it is associated with higher morbidity, mortality and health care cost than the more prevalent type 2 diabetes. Patients with T1D require exogenous insulin for survival and should be identified as soon as possible after diagnosis to avoid high morbidity due to a delay in insulin treatment. It is also important to present to the patient correct prognosis that differs by the type of diabetes. From the research point of view, correct classification should help to identify the etiologies and to develop specific prevention for T1D. This review summarizes evidence that may be helpful in diagnosing T1D in various ethnic groups. Challenges in interpretation of results commonly used to determine the type of diabetes are highlighted.

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Fuel-Stimulated Insulin Secretion Depends upon Mitochondria Activation and the Integration of Mitochondrial and Cytosolic Substrate Cycles: Gary W. Cline; Diabetes Metab J. 2011;35(5):458-465. Published online October 31, 2011; DOI: https://doi.org/10.4093/dmj.2011.35.5.458

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The pancreatic islet β-cell is uniquely specialized to couple its metabolism and rates of insulin secretion with the levels of circulating nutrient fuels, with the mitochondrial playing a central regulatory role in this process. In the β-cell, mitochondrial activation generates an integrated signal reflecting rates of oxidativephosphorylation, Kreb's cycle flux, and anaplerosis that ultimately determines the rate of insulin exocytosis. Mitochondrial activation can be regulated by proton leak and mediated by UCP2, and by alkalinization to utilize the pH gradient to drive substrate and ion transport. Converging lines of evidence support the hypothesis that substrate cycles driven by rates of Kreb's cycle flux and by anaplerosis play an integral role in coupling responsive changes in mitochondrial metabolism with insulin secretion. The components and mechanisms that account for the integrated signal of ATP production, substrate cycling, the regulation of cellular redox state, and the production of other secondary signaling intermediates are operative in both rodent and human islet β-cells.

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Clinical Allogeneic and Autologous Islet Cell Transplantation: Update: Shinichi Matsumoto; Diabetes Metab J. 2011;35(3):199-206. Published online June 30, 2011; DOI: https://doi.org/10.4093/dmj.2011.35.3.199

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Islet cell transplantation is categorized as a β-cell replacement therapy for diabetic patients who lack the ability to secrete insulin. Allogeneic islet cell transplantation is for the treatment of type 1 diabetes, and autologous islet cell transplantation is for the prevention of surgical diabetes after a total pancreatectomy. The issues of allogeneic islet cell transplantation include poor efficacy of islet isolation, the need for multiple donor pancreata, difficulty maintaining insulin independence and undesirable side effects of immunosuppressive drugs. Those issues have been solved step by step and allogeneic islet cell transplantation is almost ready to be the standard therapy. The donor shortage will be the next issue and marginal and/or living donor islet cell transplantation might alleviate the issue. Xeno-islet cell transplantation, β-cell regeneration from human stem cells and gene induction of the naïve pancreas represent the next generation of β-cell replacement therapy. Autologous islet cell transplantation after total pancreatectomy for the treatment of chronic pancreatitis with severe abdominal pain is the standard therapy, even though only limited centers are able to perform this treatment. Remote center autologous islet cell transplantation is an attractive option for hospitals performing total pancreatectomies without the proper islet isolation facilities.

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Cell Replacement and Regeneration Therapy for Diabetes: Hee-Sook Jun; Korean Diabetes J. 2010;34(2):77-83. Published online April 30, 2010; DOI: https://doi.org/10.4093/kdj.2010.34.2.77

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Reduction of beta cell function and a beta cell mass is observed in both type 1 and type 2 diabetes. Therefore, restoration of this deficiency might be a therapeutic option for treatment of diabetes. Islet transplantation has benefits, such as reduced incidence of hypoglycemia and achievement of insulin independence. However, the major drawback is an insufficient supply of islet donors. Transplantation of cells differentiated in vitro or in vivo regeneration of insulin-producing cells are possible approaches for beta cell/islet regenerative therapy. Embryonic and adult stem cells, pancreatic ductal progenitor cells, acinar cells, and other endocrine cells have been shown to differentiate into pancreatic beta cells. Formation of fully functional beta cells and the safety of these cells are critical issues for successful clinical application.

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Original Article

Effects of Anti-Vascular Endothelial Growth Factor (VEGF) on Pancreatic Islets in Mouse Model of Type 2 Diabetes Mellitus.: Ji Won Kim, Dong Sik Ham, Heon Seok Park, Yu Bai Ahn, Ki Ho Song, Kun Ho Yoon, Ki Dong Yoo, Myung Jun Kim, In Kyung Jeong, Seung Hyun Ko; Korean Diabetes J. 2009;33(3):185-197. Published online June 1, 2009; DOI: https://doi.org/10.4093/kdj.2009.33.3.185

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Abstract PDF: BACKGROUND
Vascular endothelial growth factor (VEGF) is associated with the development of diabetic complications. However, it is unknown whether systemic VEGF treatment has any effects on the pancreatic islets in an animal model of type 2 diabetes mellitus. METHODS: Anti-VEGF peptide (synthetic ATWLPPR, VEGF receptor type 2 antagonist) was injected into db/db mice for 12 weeks. We analyzed pancreatic islet morphology and quantified beta-cell mass. Endothelial cell proliferation and the severity of islet fibrosis were also measured. VEGF expression in isolated islets was determined using Western blot analysis. RESULTS: When anti-VEGF was administered, db/db mice exhibited more severe hyperglycemia and associated delayed weight gain than non-treated db/db mice. Pancreas weight and pancreatic beta-cell mass were also significantly decreased in the anti-VEGF-treated group. VEGF and VEGF receptor proteins (types 1 and 2) were expressed in the pancreatic islets, and their expression was significantly increased in the db/db group compared with the db/dm group. However, the elevated VEGF expression was significantly reduced by anti-VEGF treatment compared with the db/db group. The anti-VEGF-treated group had more prominent islet fibrosis and islet destruction than db/db mice. Intra-islet endothelial cell proliferation was also remarkably reduced by the anti-VEGF peptide. CONCLUSION: Inhibition of VEGF action by the VEGF receptor 2 antagonist not only suppressed the proliferation of intra-islet endothelial cells but also accelerated pancreatic islet destruction and aggravated hyperglycemia in a type 2 diabetes mouse model. Therefore, the potential effects of anti-VEGF treatment on pancreatic beta cell damage should be considered.

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