Diabetes & Metabolism Journal

Original Article

Basic and Translational Research
Targeting PGC-1α by miRNA-374 Simultaneously Improve β-Cell Dysfunction and Suppress Hepatic Glucose Overproduction: Ji-Won Kim, Joonyub Lee, Young-Hye You, Chan-Hee Oh, Heon-Seok Park, Eun Young Lee, Seung-Hwan Lee, Seung-Hyun Ko, Ji-Ho Park, Kun-Ho Yoon; Diabetes Metab J. 2026;50(3):535-551. Published online November 3, 2025; DOI: https://doi.org/10.4093/dmj.2025.0287

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Background
In this study, we aimed to validate the potential of miR-374 in ameliorating hyperglycemia by regulating peroxisome proliferator-activated receptor γ coactivator-1 (PGC-1α) expression in pancreatic islets and liver.
Methods
To identify miRNAs targeting PGC-1α, we performed miRNA chip analysis in rat islets under hyperglycemic and euglycemic conditions. Luciferase reporter assay was performed to identify miR binding sites in the 3’-untranslated region (3’ UTR) of PGC-1α. In db/db mice, miRNA-encapsulated adenoviruses were administered and intraperitoneal glucose tolerance test and glucose stimulated insulin secretion tests were performed. For enhanced delivery to β-cells, we developed exendin-4 (Ex-4) coated cationic lipoparticles (CCLs) encapsulating miRNAs. The therapeutic potential of Ex-4-CCL-miRNA was further evaluated in insulin-producing cells derived from induced pluripotent stem cells.
Results
By analyzing miRNA expression in primary rat islets exposed under hyperglycemic environment, we identified miR-374 as a potential target. In vitro experiments confirmed that miR-374 significantly suppressed PGC-1α expression in β-cells and hepatocytes by binding to its 3’-UTR. In vivo experiments using adenovirus-mediated miR-374 (Ad-miR-374) delivering directly to the pancreas and liver of db/db mice demonstrated improved glycemic control, enhanced insulin secretion, and downregulated hepatic gluconeogenesis-related genes (G6Pase, Pepck, PC). To enhance the clinical applicability of miR-374, we developed Ex-4-CCLs. Ex-4-CCL-miR-374 successfully alleviated hyperglycemia, restored pancreatic islet function, and decreased gluconeogenesis gene expression in db/db mice. Furthermore, Ex-4-CCL-miR-374 improved insulin secretory function in glucotoxicity-exposed human induced pluripotent stem cell-derived insulin producing cells.
Conclusion
Based on these findings, we propose that Ex-4-CCL-miR-374 as a promising therapeutic approach to reverse β-cell dysfunction and improve hepatic insulin resistance in type 2 diabetes mellitus.

Citations

Citations to this article as recorded by

β‐cell recovery revisited: Is prediabetes remission driven by insulin sensitivity or β‐cell function?
Joonyub Lee, Kun‐Ho Yoon
Journal of Diabetes Investigation.2026; 17(5): 716. CrossRef

Review

Pathophysiology
Primordial Drivers of Diabetes Heart Disease: Comprehensive Insights into Insulin Resistance: Yajie Fan, Zhipeng Yan, Tingting Li, Aolin Li, Xinbiao Fan, Zhongwen Qi, Junping Zhang; Diabetes Metab J. 2024;48(1):19-36. Published online January 3, 2024; DOI: https://doi.org/10.4093/dmj.2023.0110

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Insulin resistance has been regarded as a hallmark of diabetes heart disease (DHD). Numerous studies have shown that insulin resistance can affect blood circulation and myocardium, which indirectly cause cardiac hypertrophy and ventricular remodeling, participating in the pathogenesis of DHD. Meanwhile, hyperinsulinemia, hyperglycemia, and hyperlipidemia associated with insulin resistance can directly impair the metabolism and function of the heart. Targeting insulin resistance is a potential therapeutic strategy for the prevention of DHD. Currently, the role of insulin resistance in the pathogenic development of DHD is still under active research, as the pathological roles involved are complex and not yet fully understood, and the related therapeutic approaches are not well developed. In this review, we describe insulin resistance and add recent advances in the major pathological and physiological changes and underlying mechanisms by which insulin resistance leads to myocardial remodeling and dysfunction in the diabetic heart, including exosomal dysfunction, ferroptosis, and epigenetic factors. In addition, we discuss potential therapeutic approaches to improve insulin resistance and accelerate the development of cardiovascular protection drugs.

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Original Articles

Others
Change Profiles and Functional Targets of MicroRNAs in Type 2 Diabetes Mellitus Patients with Obesity: Guanhua Lu, Huanhuan Gao, Zhiyong Dong, Shuwen Jiang, Ruixiang Hu, Cunchuan Wang; Diabetes Metab J. 2023;47(4):559-570. Published online April 25, 2023; DOI: https://doi.org/10.4093/dmj.2022.0226

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Background
MicroRNAs (miRNAs) exert an essential contribution to obesity and type 2 diabetes mellitus (T2DM). This study aimed to investigate the differences of miRNAs in the presence and absence of T2DM in patients with obesity, as well as before and after bariatric surgery in T2DM patients with obesity. Characterization of the common changes in both was further analyzed.
Methods
We enrolled 15 patients with obesity but without T2DM and 15 patients with both obesity and T2DM. Their preoperative clinical data and serum samples were collected, as well as 1 month after bariatric surgery. The serum samples were analyzed by miRNA sequencing, and the miRNAs profiles and target genes characteristics were compared.
Results
Patients with T2DM had 16 up-regulated and 32 down-regulated miRNAs compared to patients without T2DM. Improvement in metabolic metrics after bariatric surgery of T2DM patients with obesity was correlated with changes in miRNAs, as evidenced by the upregulation of 20 miRNAs and the downregulation of 30 miRNAs. Analysis of the two miRNAs profiles identified seven intersecting miRNAs that showed opposite changes. The target genes of these seven miRNAs were substantially enriched in terms or pathways associated with T2DM.
Conclusion
We determined the expression profiles of miRNAs in the obese population, with and without diabetes, before and after bariatric surgery. The miRNAs that intersected in the two comparisons were discovered. Both the miRNAs discovered and their target genes were closely associated with T2DM, demonstrating that they might be potential targets for the regulation of T2DM.

Citations

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Neurovascular Impairment in Type 2 Diabetes Mellitus: The Role of Adipocyte-Derived Exosomes
Harshal Sawant, Ji Chen Bihl
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Sara Cannito, Maria Teresa Rocchetti, Michele Magnesa, Francesca Scaltrito, Daniela Fiocco, Ida Giardino
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Rabeah Al-Temaimi, Rasheed Ahmad, Kusum Kapila, Fahd Al-Mulla, Claire Stocker
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New discoveries in therapeutic targets and drug development pathways for type 2 diabetes mellitus under the guidance of precision medicine
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European Journal of Medical Research.2025;[Epub] CrossRef
Early changes of microRNAs in blood one month after bariatric surgery
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Basic Research
Long Non-Coding RNA TUG1 Attenuates Insulin Resistance in Mice with Gestational Diabetes Mellitus via Regulation of the MicroRNA-328-3p/SREBP-2/ERK Axis: Xuwen Tang, Qingxin Qin, Wenjing Xu, Xuezhen Zhang; Diabetes Metab J. 2023;47(2):267-286. Published online January 19, 2023; DOI: https://doi.org/10.4093/dmj.2021.0216

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Background
Long non-coding RNAs (lncRNAs) have been illustrated to contribute to the development of gestational diabetes mellitus (GDM). In the present study, we aimed to elucidate how lncRNA taurine upregulated gene 1 (TUG1) influences insulin resistance (IR) in a high-fat diet (HFD)-induced mouse model of GDM.
Methods
We initially developed a mouse model of HFD-induced GDM, from which islet tissues were collected for RNA and protein extraction. Interactions among lncRNA TUG1/microRNA (miR)-328-3p/sterol regulatory element binding protein 2 (SREBP-2) were assessed by dual-luciferase reporter assay. Fasting blood glucose (FBG), fasting insulin (FINS), homeostasis model assessment of insulin resistance (HOMA-IR), HOMA pancreatic β-cell function (HOMA-β), insulin sensitivity index for oral glucose tolerance tests (ISOGTT) and insulinogenic index (IGI) levels in mouse serum were measured through conducting gain- and loss-of-function experiments.
Results
Abundant expression of miR-328 and deficient expression of lncRNA TUG1 and SREBP-2 were characterized in the islet tissues of mice with HFD-induced GDM. LncRNA TUG1 competitively bound to miR-328-3p, which specifically targeted SREBP-2. Either depletion of miR-328-3p or restoration of lncRNA TUG1 and SREBP-2 reduced the FBG, FINS, HOMA-β, and HOMA-IR levels while increasing ISOGTT and IGI levels, promoting the expression of the extracellular signal-regulated kinase (ERK) signaling pathway-related genes, and inhibiting apoptosis of islet cells in GDM mice. Upregulation miR-328-3p reversed the alleviative effects of SREBP-2 and lncRNA TUG1 on IR.
Conclusion
Our study provides evidence that the lncRNA TUG1 may prevent IR following GDM through competitively binding to miR-328-3p and promoting the SREBP-2-mediated ERK signaling pathway inactivation.

Citations

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Ritu Rani, Avinash Kumar Sharma, Havagiray R Chitme
Clinical Medicine Insights: Endocrinology and Diabetes.2023;[Epub] CrossRef
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Dong Gao, Liping Ren, Yu-Duo Hao, Nalini Schaduangrat, Xiao-Wei Liu, Shi-Shi Yuan, Yu-He Yang, Yan Wang, Watshara Shoombuatong, Hui Ding
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Type 1 Diabetes
Differential Profile of Plasma Circular RNAs in Type 1 Diabetes Mellitus: Yangyang Li, Ying Zhou, Minghui Zhao, Jing Zou, Yuxiao Zhu, Xuewen Yuan, Qianqi Liu, Hanqing Cai, Cong-Qiu Chu, Yu Liu; Diabetes Metab J. 2020;44(6):854-865. Published online July 13, 2020; DOI: https://doi.org/10.4093/dmj.2019.0151

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Background

No currently available biomarkers or treatment regimens fully meet therapeutic needs of type 1 diabetes mellitus (T1DM). Circular RNA (circRNA) is a recently identified class of stable noncoding RNA that have been documented as potential biomarkers for various diseases. Our objective was to identify and analyze plasma circRNAs altered in T1DM.

Methods

We used microarray to screen differentially expressed plasma circRNAs in patients with new onset T1DM (n=3) and age-/gender-matched healthy controls (n=3). Then, we selected six candidates with highest fold-change and validated them by quantitative real-time polymerase chain reaction in independent human cohort samples (n=12). Bioinformatic tools were adopted to predict putative microRNAs (miRNAs) sponged by these validated circRNAs and their downstream messenger RNAs (mRNAs). Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses were performed to gain further insights into T1DM pathogenesis.

Results

We identified 68 differentially expressed circRNAs, with 61 and seven being up- and downregulated respectively. Four of the six selected candidates were successfully validated. Curations of their predicted interacting miRNAs revealed critical roles in inflammation and pathogenesis of autoimmune disorders. Functional relations were visualized by a circRNA-miRNA-mRNA network. GO and KEGG analyses identified multiple inflammation-related processes that could be potentially associated with T1DM pathogenesis, including cytokine-cytokine receptor interaction, inflammatory mediator regulation of transient receptor potential channels and leukocyte activation involved in immune response.

Conclusion

Our study report, for the first time, a profile of differentially expressed plasma circRNAs in new onset T1DM. Further in silico annotations and bioinformatics analyses supported future application of circRNAs as novel biomarkers of T1DM.

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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 Article

Technology/Device
Role of MicroRNA-34a in Anti-Apoptotic Effects of Granulocyte-Colony Stimulating Factor in Diabetic Cardiomyopathy: In-Hwa Park, Yi-Sun Song, Hyun-Woo Joo, Guang-Yin Shen, Jin-Hee Seong, Na-Kyoung Shin, Young Jong Cho, Yonggu Lee, Jeong Hun Shin, Young-Hyo Lim, Hyuck Kim, Kyung-Soo Kim; Diabetes Metab J. 2020;44(1):173-185. Published online April 23, 2019; DOI: https://doi.org/10.4093/dmj.2018.0211

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Background

Recent studies have shown that microRNAs (miRNAs) are involved in the process of cardiomyocyte apoptosis. We have previously reported that granulocyte-colony stimulating factor (G-CSF) ameliorated diastolic dysfunction and attenuated cardiomyocyte apoptosis in a rat model of diabetic cardiomyopathy. In this study, we hypothesized a regulatory role of cardiac miRNAs in the mechanism of the anti-apoptotic effect of G-CSF in a diabetic cardiomyopathy rat model.

Methods

Rats were given a high-fat diet and low-dose streptozotocin injection and then randomly allocated to receive treatment with either G-CSF or saline. H9c2 rat cardiomyocytes were cultured under a high glucose (HG) condition to induce diabetic cardiomyopathy in vitro. We examined the extent of apoptosis, miRNA expression, and miRNA target genes in the myocardium and H9c2 cells.

Results

G-CSF treatment significantly decreased apoptosis and reduced miR-34a expression in diabetic myocardium and H9c2 cells under the HG condition. G-CSF treatment also significantly increased B-cell lymphoma 2 (Bcl-2) protein expression as a target for miR-34a. In addition, transfection with an miR-34a mimic significantly increased apoptosis and decreased Bcl-2 luciferase activity in H9c2 cells.

Conclusion

Our results indicate that G-CSF might have an anti-apoptotic effect through down-regulation of miR-34a in a diabetic cardiomyopathy rat model.

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