Sirtuin 1 Mediates Hydrogen Sulfide-induced Cytoprotection Effects in Neonatal Mouse Cardiomyocytes

BACKGROUND: Current knowledge indicates that oxidative damage and the following inflammation is pivotal pathway for myocardial cell death. In recent decades, hydrogen sulfide (H(2)S) has been identified as a novel endogenous vasodilator and neuromodulator due to its antioxidation capacity. However, whether H(2)S pretreatment in neonatal mouse cardiomyocytes is a protection effect against oxidative stress remains elusive. METHODS: Primary neonatal mouse cardiomyocytes were isolated and cultured, subsequently, pretreated with the H(2)S donor, sodium hydrosulfide (NaHS). Cell viability, lactate dehydrogenase (LDH) release, and reactive oxygen species (ROS) production are evaluated. The levels of superoxide dismutase (Sod2) and Sirtuin 1 (Sirt1), a deacetylation enzyme, were detected by Western blotting. The statistics was performed using independent-sample t-test. RESULTS: NaHS (100 μmol/L) had no toxicity to primary neonatal mouse cardiomyocytes. Furthermore, NaHS pretreatment significantly improved neonatal mouse cardiomyocytes survival after H(2)O(2)-induced cell death, indicated by the decrease in LDH release (40.00 ± 2.65% vs. 65.33 ± 4.33%, P < 0.01) and ROS production (1.90 ± 0.33 vs. 4.56 ± 0.56, P < 0.05), and that the salubrious effect was accompanied by the upregulation of Sod2 expression. In addition, the study showed that NaHS pretreatment improved mitochondrial DNA number in neonatal mouse cardiomyocyte. Furthermore, the result demonstrated NaHS increased the expression of Sirt1 in neonatal mouse cardiomyocyte. Ex 527, an inhibitor of Sirt1, could attenuate these effects of NaHS-induced Sod2 expression and mtDNA number increase, furthermore, abrogate the cytoprotective effects of NaHS for neonatal mouse cardiomyocytes. CONCLUSION: Sirt1 mediated H(2)S-induced cytoprotection effects in neonatal mouse cardiomyocytes.