|Title:||Advanced glycation end-products induce apoptosis in pancreatic islet endothelial cells via NF-κB-activated cyclooxygenase-2/prostaglandin e2 up-regulation||Authors:||Lan K.-C.
|Issue Date:||2015||Publisher:||Public Library of Science||Journal Volume:||10||Journal Issue:||4||Start page/Pages:||e0124418||Source:||PLoS ONE||Abstract:||
Microvascular complications eventually affect nearly all patients with diabetes. Advanced glycation end-products (AGEs) resulting from hyperglycemia are a complex and heterogeneous group of compounds that accumulate in the plasma and tissues in diabetic patients. They are responsible for both endothelial dysfunction and diabetic vasculopathy. The aim of this study was to investigate the cytotoxicity of AGEs on pancreatic islet microvascular endothelial cells. The mechanism underlying the apoptotic effect of AGEs in pancreatic islet endothelial cell line MS1 was explored. The results showed that AGEs significantly decreased MS1 cell viability and induced MS1 cell apoptosis in a dose-dependent manner. AGEs dose-dependently increased the expressions of cleaved caspase-3, and cleaved poly (ADP-ribose) polymerase in MS1 cells. Treatment of MS1 cells with AGEs also resulted in increased nuclear factor (NF)-κB-p65 phosphorylation and cyclooxygenase (COX)-2 expression. However, AGEs did not affect the expressions of endoplasmic reticulum (ER) stress-related molecules in MS1 cells. Pretreatment with NS398 (a COX-2 inhibitor) to inhibit prostaglandin E2 (PGE2) production reversed the induction of cleaved caspase-3, cleaved PARP, and MS1 cell viability. Moreover, AGEs significantly increased the receptor for AGEs (RAGE) protein expression in MS1 cells, which could be reversed by RAGE neutralizing antibody. RAGE Neutralizing antibody could also reverse the induction of cleaved caspase-3 and cleaved PARP and decreased cell viability induced by AGEs. These results implicate the involvement of NF-κB-activated COX-2/PGE2 up-regulation in AGEs/RAGE-induced islet endothelial cell apoptosis and cytotoxicity. These2ndings may provide insight into the pathological processes within the pancreatic islet microvasculature induced by AGEs accumulation. ? 2015 Lan et al.
|ISSN:||1932-6203||DOI:||10.1371/journal.pone.0124418||SDG/Keyword:||advanced glycation end product; advanced glycation end product receptor; caspase 3; cyclooxygenase 2; immunoglobulin enhancer binding protein; n (2 cyclohexyloxy 4 nitrophenyl)methanesulfonamide; nicotinamide adenine dinucleotide adenosine diphosphate ribosyltransferase; prostaglandin E2; transcription factor RelA; advanced glycation end product; cyclooxygenase 2; immunoglobulin enhancer binding protein; prostaglandin E2; Ptgs2 protein, mouse; animal cell; apoptosis; Article; bioaccumulation; cell mediated cytotoxicity; cell viability; controlled study; endothelium cell; enzyme inhibition; in vitro study; mouse; MS1 cell line; nonhuman; pancreas islet cell; protein analysis; protein cleavage; protein expression; protein function; protein phosphorylation; protein synthesis; signal transduction; upregulation; animal; biosynthesis; cell line; cell survival; diabetic angiopathy; endoplasmic reticulum stress; endothelium cell; enzyme activation; metabolism; pancreas islet; pathology; physiology; vascularization; Animals; Apoptosis; Cell Line; Cell Survival; Cyclooxygenase 2; Diabetic Angiopathies; Dinoprostone; Endoplasmic Reticulum Stress; Endothelial Cells; Enzyme Activation; Glycosylation End Products, Advanced; Islets of Langerhans; Mice; NF-kappa B; Up-Regulation
|Appears in Collections:||醫學系|
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