Effect of H?S on the circadian rhythm of mouse hepatocytes.

ABSTRACT: BACKGROUND: Dysregulation of circadian rhythms can contribute to diseases of lipid metabolism. NAD-dependent deacetylase sirtuin-1(SIRT1) is an important hub which links lipid metabolism with circadian clock by its deacetylation activity depends on intracellular NAD+/NADH content ratio. Hydrogen sulfide (H?S) is an endogenous reductant which can affect the intracellular redox state. Therefore, we hypothesized that exogenous H?S can affect the expression of circadian clock genes mediated by sirt1 thereby affecting body's lipid metabolism. And also because the liver is a typical peripheral circadian clock oscillator that is intimately linked to lipid metabolism. Thus the effect of H?S were observed on 24-hour dynamic expression of 4 central circadian clock genes and sirt1gene in primary cultured hepatocytes. RESULTS: We established a hepatocyte model that showed a circadian rhythm by serum shock method. And detected that the expression level and the peak of circadian clock genes decreased gradually and H?S could maintain the expression and amplitude of circadian clock genes such as Clock, Per2, Bmal1 and Rev-erb?within a certain period time. Accordingly the expression level of sirt1 in H?S group was significantly higher than that in the control group. CONCLUSION: Exogenous reductant H?S maintain the circadian rhythm of clock gene in isolated liver cells. We speculated that H?S has changed NAD+/NADH content ratio in hepatocytes and enhanced the activity of SIRT1 protein directly or indirectly, so as to maintain the rhythm of expression of circadian clock genes, they play a role in the prevention and treatment of lipid metabolism-related disease caused by the biological clock disorders.

SUBMITTER: Shang Z 

PROVIDER: S-EPMC3292508 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature