Metformin prevents glucose-induced protein kinase C-beta2 activation in human umbilical vein endothelial cells through an antioxidant mechanism. - Gallo,A.; Ceolotto,G.; Pinton,P.; Iori,E.; Murphy,E.; Rutter,GA.; Rizzuto,R.; Semplicini,A.; Avogaro,A. (Diabetes, 2005)