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Metformin prevents an adaptive increase in GSH and induces apoptosis under the conditions of GSH deficiency in H4IIE cells

Cited 15 time in Web of Science Cited 15 time in Scopus
Authors
Bae, Eun Ju; Cho, Min Joo; Kim, Sang Geon
Issue Date
2007-07-27
Publisher
Taylor & Francis
Citation
J. Toxicol. Environ. Health A. 70, 1371-1380.
Keywords
AMP-Activated Protein KinasesApoptosis/*drug effectsCell LineGlutathione/*drug effects/metabolismHepatocytes/*drug effectsHumansHypoglycemic Agents/*pharmacologyMetformin/*pharmacologyMultienzyme Complexes/drug effects/metabolismOxidative Stress/*drug effectsProtein-Serine-Threonine Kinases/drug effects/metabolism
Abstract
The antidiabetic effect of metformin is mediated by activation of AMP-activated kinase (AMPK). This study investigated whether metformin at a high pharmacologic concentration alters the levels of cellular GSH in H4IIE hepatocytes and if so, whether the agent affects cell viability under GSH-deficient conditions. Treatment of cells with either metformin or 5-aminoimidazole-4-carboxamide riboside (AICAR) increased dichlorofluorescein oxidation, as did tert-butylhydroxyquinone (t-BHQ). Metformin or AICAR treatment blocked a rebound increase in GSH produced by t-BHQ and decreased GSH content below that of control. Exposure of cells to metformin or metformin + t-BHQ for 24 hr did not produce cell death. However, metformin treatment in combination with t-BHQ for a prolonged period of time (48 hr) at the concentrations, at which each agent was non-toxic, produced apoptosis. Treatment of AICAR with t-BHQ resulted in similar effects. Induction of apoptosis by the combination treatment was evidenced by changes in mitochondrial cytochrome c content, BCl(xl) expression, poly(ADP-ribose)polymerase (PARP) cleavage and caspase-3 activation. Compound C, an AMPK inhibitor, reversed apoptosis and changes in the apoptotic markers, suggesting a role of AMPK activation by metformin in the apoptotic process. Similarly, metformin treatment, when combined with buthionine sulfoximine or doxorubicin, induced apoptosis. Our data indicated that metformin prevents an adaptive increase in cellular GSH in H4IIE cells, and therefore induces apoptosis under the conditions of GSH deficiency.
ISSN
1528-7394 (Print)
Language
English
URI
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=17654257

https://hdl.handle.net/10371/21299
DOI
https://doi.org/10.1080/15287390701434430
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College of Medicine/School of Medicine (의과대학/대학원)Program in Clinical Pharmacology (협동과정-임상약리학전공)Journal Papers (저널논문_협동과정-임상약리학전공)
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