BACKGROUND: This study was to test the hypothesis that enhanced oxidative stress is induced in monocytes with over-activated NADPH oxidase during the development of type 2 diabetes mellitus. METHODS: Levels of glucose and lipids were analyzed in 73 diabetic patients and 36 controls. Superoxide dismutase (SOD), malondialdehyde (MDA), reactive oxygen species (ROS) and protein carbonylation were tested. Expression of NADPH oxidase was examined and p47phox translocation was assessed. RESULTS: With the abnormality of glucose and lipid metabolism, diabetic patients showed a higher oxidative stress state indicated by decreased SOD activity but elevated MDA and protein carbonylation level. Monocytes in diabetes also showed elevated ROS generation and protein carbonylation level. Furthermore, NADPH oxidase was highly activated in monocytes represented by p22phox up-regulation and p47phox translocation. Significant positive bivariate correlation was found between glucose and MDA level as well as p22phox expression. In vitro experiments also indicated that glucose could stimulate ROS generation in a NADPH oxidase dependent manner. Moreover, we carried out same measurement in 40 diabetic patients with anti-diabetic intervention and obtained the reinforced results. CONCLUSIONS: Hyperglycemia is the main factor which induces oxidative stress mainly by activation of NADPH oxidase in monocytes of diabetic patients.
BACKGROUND: This study was to test the hypothesis that enhanced oxidative stress is induced in monocytes with over-activated NADPH oxidase during the development of type 2 diabetes mellitus. METHODS: Levels of glucose and lipids were analyzed in 73 diabeticpatients and 36 controls. Superoxide dismutase (SOD), malondialdehyde (MDA), reactive oxygen species (ROS) and protein carbonylation were tested. Expression of NADPH oxidase was examined and p47phox translocation was assessed. RESULTS: With the abnormality of glucose and lipid metabolism, diabeticpatients showed a higher oxidative stress state indicated by decreased SOD activity but elevated MDA and protein carbonylation level. Monocytes in diabetes also showed elevated ROS generation and protein carbonylation level. Furthermore, NADPH oxidase was highly activated in monocytes represented by p22phox up-regulation and p47phox translocation. Significant positive bivariate correlation was found between glucose and MDA level as well as p22phox expression. In vitro experiments also indicated that glucose could stimulate ROS generation in a NADPH oxidase dependent manner. Moreover, we carried out same measurement in 40 diabeticpatients with anti-diabetic intervention and obtained the reinforced results. CONCLUSIONS:Hyperglycemia is the main factor which induces oxidative stress mainly by activation of NADPH oxidase in monocytes of diabeticpatients.
Authors: Shekhar H Deo; Nathan T Jenkins; Jaume Padilla; Alan R Parrish; Paul J Fadel Journal: Am J Physiol Regul Integr Comp Physiol Date: 2013-09-25 Impact factor: 3.619
Authors: Rheal A Towner; Nataliya Smith; Debra Saunders; Michael Henderson; Kristen Downum; Florea Lupu; Robert Silasi-Mansat; Dario C Ramirez; Sandra E Gomez-Mejiba; Marcelo G Bonini; Marilyn Ehrenshaft; Ronald P Mason Journal: Diabetes Date: 2012-06-14 Impact factor: 9.461