Exendin-4 protected murine MIN6 pancreatic beta-cells from oxidative stress-induced apoptosis via down-regulation of NF-kappaB-iNOS-NO pathway
Liu, L.-b.; Wang, Y.-p.; Pan, X.-d.; Jiang, S.-y.; Chen, Z.
Yao Xue Xue Bao 43(7): 690-694
2008
ISSN/ISBN: 0513-4870 PMID: 18819471 Document Number: 623934
To explore the effect of glucagon-like peptide-1 receptor agonist--Exendin-4 (Ex-4) on murine MIN6 pancreatic beta-cells apoptosis induced by oxidative stress, the morphological changes of cell damage were evaluated by epifluorescence microscopy after staining with AO-EB. The percentage of cell apoptosis was determined by flow cytometric assay after Annexin-V-FITC-PI staining. Nitric oxide level was measured by Griess reagent assay. Inducible nitric oxide synthase (iNOS) protein and NF-kappaBp65 fragment were detected by Western blotting. Ex-4 inhibited the increase of nitrite level and percentage of apoptosis induced by t-BHP in MIN6 cells. Furthermore, Ex-4 partly reduced the expression of iNOS protein and the ratio of NF-kappaBp65 protein in nucleus:cytosol induced by t-BHP. These results suggest that Ex4 protects MIN6 pancreatic kappa-cells from oxidative stress-induced apoptosis via down-regulation of NF-kappaB-iNOS-nitric oxide pathway.