SIRT3 Modulates Endothelial Mitochondrial Redox State during Insulin Resistance.

ABSTRACT: Emerging evidence indicates that defects in sirtuin signaling contribute to impaired glucose and lipid metabolism, resulting in insulin resistance (IR) and endothelial dysfunction. Here, we examined the effects of palmitic acid (PA) treatment on mitochondrial sirtuins (SIRT2, SIRT3, SIRT4, and SIRT5) and oxidative homeostasis in human endothelial cells (TeloHAEC). Results showed that treatment for 48 h with PA (0.5 mM) impaired cell viability, induced loss of insulin signaling, imbalanced the oxidative status (p < 0.001), and caused negative modulation of sirtuin protein and mRNA expression, with a predominant effect on SIRT3 (p < 0.001). Restoration of SIRT3 levels by mimic transfection (SIRT3⁺) suppressed the PA-induced autophagy (mimic NC+PA) (p <

SUBMITTER: Martino E 

PROVIDER: S-EPMC9404744 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature