Reduction in mitochondrialmembrane peroxidizability index and protein lipoxidation levels in therat heart after ß-adrenergic receptor signaling interruption with the ß-blocker atenolol

Abstract

A new mammalian longevity model based on ß-adrenergic signaling interruption at the level of adenylyl cyclase has reported decreased bone and heart aging and mean and maximum longevity increases in AC5KO mice (1). We decided to mimic this model in male Wistar rats treated with the ß-blocker atenolol in the drinking water and to check if an oxidative stress decrease could be involved. Atenolol treatment did not modify heart mitROS generation rate and mitDNA oxidative damage but significantly decreased global peroxidizability index of mitochondrial membranes, as well as protein lipoxidation, probably mediated by changes in elongases and desaturases activities.