| 15567152 |
Tsubouchi H, Inoguchi T, Inuo M, Kakimoto M, Sonta T, Sonoda N, Sasaki S, Kobayashi K, Sumimoto H, Nawata H: Sulfonylurea as well as elevated glucose levels stimulate reactive oxygen species production in the pancreatic beta-cell line, MIN6-a role of NAD (P) H oxidase in beta-cells. Biochem Biophys Res Commun. 2005 Jan 7;326(1):60-5.
Increased oxidative stress may play a key role in the progressive deterioration of pancreatic beta-cells and the development of diabetes. However, the underlying mechanism is not well understood. Exposure of pancreatic beta-cell line, MIN6 cells, to elevated glucose level for 2h induced an increase in reactive oxygen species (ROS) production, as evaluated by the staining of 2',7'-dichlorofluorescein diacetate. This effect was completely blocked by NAD (P) H oxidase inhibitor (diphenylene iodonium) and protein kinase C (PKC) inhibitor (calphostin C), but not affected by other flavoprotein inhibitors (rotenone, oxypurinol, or l-N-monomethyl arginine). Glibenclamide also stimulated ROS production in a dose-dependent manner. This effect was again blocked by diphenylene iodonium and calphostin C. In conclusion, insulin secretagogues, both glibenclamide and elevated glucose level, stimulated ROS production in beta-cells through a PKC-dependent activation of NAD (P) H oxidase. This mechanism may be a novel therapeutic target for preventing the progression of beta-cell deterioration. |
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