Diabetes & Metabolism Journal

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 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
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
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
Diabetes & Metabolism.2022; 48(4): 101359. CrossRef
Insight Into Rho Kinase Isoforms in Obesity and Energy Homeostasis
Lei Wei, Jianjian Shi
Frontiers in Endocrinology.2022;[Epub] CrossRef
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
SSRN Electronic Journal .2022;[Epub] CrossRef
Metformin Dysregulates the Unfolded Protein Response and the WNT/β-Catenin Pathway in Endometrial Cancer Cells through an AMPK-Independent Mechanism
Domenico Conza, Paola Mirra, Gaetano Calì, Luigi Insabato, Francesca Fiory, Francesco Beguinot, Luca Ulianich
Cells.2021; 10(5): 1067. CrossRef
NADPH Oxidase (NOX) Targeting in Diabetes: A Special Emphasis on Pancreatic β-Cell Dysfunction
Suma Elumalai, Udayakumar Karunakaran, Jun-Sung Moon, Kyu-Chang Won
Cells.2021; 10(7): 1573. CrossRef
Metformin use and cardiovascular outcomes in patients with diabetes and chronic kidney disease: a nationwide cohort study
Min Ho Kim, Hyung Jung Oh, Soon Hyo Kwon, Jin Seok Jeon, Hyunjin Noh, Dong Cheol Han, Hyoungnae Kim, Dong-Ryeol Ryu
Kidney Research and Clinical Practice.2021; 40(4): 660. CrossRef
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
Antioxidants.2020; 9(11): 1057. CrossRef
Metformin Reduces Lipotoxicity-Induced Meta-Inflammation in β-Cells through the Activation of GPR40-PLC-IP3 Pathway
Ximei Shen, Beibei Fan, Xin Hu, Liufen Luo, Yuanli Yan, Liyong Yang
Journal of Diabetes Research.2019; 2019: 1. CrossRef

Others
Rg3 Improves Mitochondrial Function and the Expression of Key Genes Involved in Mitochondrial Biogenesis in C2C12 Myotubes: Min Joo Kim, Young Do Koo, Min Kim, Soo Lim, Young Joo Park, Sung Soo Chung, Hak C. Jang, Kyong Soo Park; Diabetes Metab J. 2016;40(5):406-413. Published online August 12, 2016; DOI: https://doi.org/10.4093/dmj.2016.40.5.406

5,585 View
76 Download
22 Web of Science
22 Crossref

Abstract PDF PubReader

Background

Panax ginseng has glucose-lowering effects, some of which are associated with the improvement in insulin resistance in skeletal muscle. Because mitochondria play a pivotal role in the insulin resistance of skeletal muscle, we investigated the effects of the ginsenoside Rg3, one of the active components of P. ginseng, on mitochondrial function and biogenesis in C2C12 myotubes.

Methods

C2C12 myotubes were treated with Rg3 for 24 hours. Insulin signaling pathway proteins were examined by Western blot. Cellular adenosine triphosphate (ATP) levels and the oxygen consumption rate were measured. The protein or mRNA levels of mitochondrial complexes were evaluated by Western blot and quantitative reverse transcription polymerase chain reaction analysis.

Results

Rg3 treatment to C2C12 cells activated the insulin signaling pathway proteins, insulin receptor substrate-1 and Akt. Rg3 increased ATP production and the oxygen consumption rate, suggesting improved mitochondrial function. Rg3 increased the expression of peroxisome proliferator-activated receptor γ coactivator 1α, nuclear respiratory factor 1, and mitochondrial transcription factor, which are transcription factors related to mitochondrial biogenesis. Subsequent increased expression of mitochondrial complex IV and V was also observed.

Conclusion

Our results suggest that Rg3 improves mitochondrial function and the expression of key genes involved in mitochondrial biogenesis, leading to an improvement in insulin resistance in skeletal muscle. Rg3 may have the potential to be developed as an anti-hyperglycemic agent.

Citations

Citations to this article as recorded by

Comparison of Ginseng Leaf Extract and Its Acid-Treated Form, UG0712 Between Their Effects on Exercise Performance in Mice
Young Jin Lee, Su Hyun Yu, Gwang Yeong Seok, Su Yeon Kim, Mi Jeong Kim, Inhye Jeong, Wan Heo, Bo Su Lee, Seon Gil Do, Bok Kyung Han, Young Jun Kim
Food Supplements and Biomaterials for Health.2024;[Epub] CrossRef
Ginsenosides for the treatment of insulin resistance and diabetes: Therapeutic perspectives and mechanistic insights
Tae Hyun Kim
Journal of Ginseng Research.2024; 48(3): 276. CrossRef
Preparation and bioactivity of the rare ginsenosides Rg3 and Rh2: An updated review
Wenqi Xu, Wei Lyu, Cuicui Duan, Fumin Ma, Xiaolei Li, Dan Li
Fitoterapia.2023; 167: 105514. CrossRef
Ginsenoside Rc, an Active Component of Panax ginseng, Alleviates Oxidative Stress-Induced Muscle Atrophy via Improvement of Mitochondrial Biogenesis
Aeyung Kim, Sang-Min Park, No Soo Kim, Haeseung Lee
Antioxidants.2023; 12(8): 1576. CrossRef
Ginsenoside Rg3 protects glucocorticoid‑induced muscle atrophy in vitro through improving mitochondrial biogenesis and myotube growth
Ryuni Kim, Jee Kim, Sang-Jin Lee, Gyu-Un Bae
Molecular Medicine Reports.2022;[Epub] CrossRef
Beneficial Effects of Walnut Oligopeptides on Muscle Loss in Senescence-Accelerated Mouse Prone-8 (SAMP8) Mice: Focusing on Mitochondrial Function
Rui Fan, Yuntao Hao, Qian Du, Jiawei Kang, Meihong Xu, Yong Li
Nutrients.2022; 14(10): 2051. CrossRef
Ginseng and ginsenosides: Therapeutic potential for sarcopenia
Weiwei Zha, Yuanhai Sun, Wenwen Gong, Linghuan Li, Wonnam Kim, Hanbing Li
Biomedicine & Pharmacotherapy.2022; 156: 113876. CrossRef
Bioactive Oligopeptides from Ginseng (Panax ginseng Meyer) Suppress Oxidative Stress-Induced Senescence in Fibroblasts via NAD+/SIRT1/PGC-1α Signaling Pathway
Na Zhu, Mei-Hong Xu, Yong Li
Nutrients.2022; 14(24): 5289. CrossRef
Review of ginsenosides targeting mitochondrial function to treat multiple disorders: Current status and perspectives
Qingxia Huang, Song Gao, Daqing Zhao, Xiangyan Li
Journal of Ginseng Research.2021; 45(3): 371. CrossRef
The Effects of Korean Red Ginseng on Biological Aging and Antioxidant Capacity in Postmenopausal Women: A Double-Blind Randomized Controlled Study
Tae-Ha Chung, Ji-Hye Kim, So-Young Seol, Yon-Ji Kim, Yong-Jae Lee
Nutrients.2021; 13(9): 3090. CrossRef
A comprehensive review on the phytochemistry, pharmacokinetics, and antidiabetic effect of Ginseng
Yage Liu, Hao Zhang, Xuan Dai, Ruyuan Zhu, Beibei Chen, Bingke Xia, Zimengwei Ye, Dandan Zhao, Sihua Gao, Alexander N. Orekhov, Dongwei Zhang, Lili Wang, Shuzhen Guo
Phytomedicine.2021; 92: 153717. CrossRef
Chronic Adipose Tissue Inflammation Linking Obesity to Insulin Resistance and Type 2 Diabetes
Federica Zatterale, Michele Longo, Jamal Naderi, Gregory Alexander Raciti, Antonella Desiderio, Claudia Miele, Francesco Beguinot
Frontiers in Physiology.2020;[Epub] CrossRef
Stereoisomer-specific ginsenoside 20(S)-Rg3 reverses replicative senescence of human diploid fibroblasts via Akt-mTOR-Sirtuin signaling
Kyeong-Eun Yang, Hyun-Jin Jang, In-Hu Hwang, Eun Mi Hong, Min-Goo Lee, Soon Lee, Ik-Soon Jang, Jong-Soon Choi
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Mitochondrial Dysfunction in Adipocytes as a Primary Cause of Adipose Tissue Inflammation
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Frontiers in Pharmacology.2018;[Epub] CrossRef
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Molecular signaling of ginsenosides Rb1, Rg1, and Rg3 and their mode of actions
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