Upregulation of endogenous glutathione system by 3H-1,2-dithiole-3-thione in pancreatic RINm5F beta-cells as a novel strategy for protecting against oxidative beta-cell injury.
This study was undertaken to investigate the inducibility of glutathione (GSH), glutathione reductase (GR) and glutathione peroxidase (GPx) by 3H-1,2-dithiole-3-thione (D3T) in beta-cells, and the resultant cytoprotection against oxidant injury. Incubation of the insulin-secreting RINm5F cells with D3T led to significant induction of GSH, GR and GPx. D3T-mediated induction of GSH was abolished by buthionine sulfoximine (BSO), suggesting a critical involvement of gamma-glutamylcysteine ligase (gammaGCL). Consistently, incubation of RINm5F cells with D3T resulted in increased expression of gammaGCL protein and mRNA. Pretreatment of RINm5F cells with D3T provided remarkable protection against oxidant-elicited cytotoxicity. On the other hand, depletion of cellular GSH by BSO sensitized RINm5F cells to oxidant injury. Furthermore, cotreatment of RINm5F cells with BSO to reverse D3T-mediated GSH induction abolished the cytoprotective effects of D3T on oxidant injury. Taken together, this study demonstrates that upregulation of glutathione system by D3T is effective for protecting against oxidative beta-cell injury.
Zhu
Hong
H
Department of Internal Medicine and Davis Heart & Lung Research Institute, The Ohio State University College of Medicine and Public Health, 473 West 12th Avenue, Columbus, OH 43210, USA.
Zhang
Li
L
Trush
Michael A
MA
Li
Yunbo
Y
D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D019328:Buthionine Sulfoximine / Q000494:pharmacology; D002460:Cell Line / Q000187:drug effects; D004353:Drug Evaluation, Preclinical; D004790:Enzyme Induction / Q000187:drug effects; D005721:Glutamate-Cysteine Ligase / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology; D005978:Glutathione / Q000378:metabolism*; D005979:Glutathione Peroxidase / Q000096:biosynthesis* / Q000235:genetics; D005980:Glutathione Reductase / Q000096:biosynthesis* / Q000235:genetics; D050417:Insulin-Secreting Cells / Q000187:drug effects* / Q000378:metabolism; D016877:Oxidants / Q000633:toxicity; D018384:Oxidative Stress / Q000187:drug effects; D051381:Rats; D017382:Reactive Oxygen Species / Q000378:metabolism; D013871:Thiones / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D013876:Thiophenes / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D015854:Up-Regulation / Q000187:drug effects
D000975:Antioxidants; D016877:Oxidants; D017382:Reactive Oxygen Species; D013871:Thiones; D013876:Thiophenes; D019328:Buthionine Sulfoximine; D005979:Glutathione Peroxidase; D005980:Glutathione Reductase; D005721:Glutamate-Cysteine Ligase; D005978:Glutathione; C049325:1,2-dithiol-3-thione