Nonalcoholic fatty liver disease (NAFLD) is the most common liver disease worldwide. Caveolae are flask-shaped invaginations of the plasma membrane enriched with cholesterol and phospholipid. Caveolin1 is the resident structural protein of caveolae and has previously been reported to involve in hepatic steatosis and NAFLD, while the mechanism remains elusive. Here we examined the effects of caveolin1 on palmitic acid (PA)-induced hepatic steatosis. Stable caveolin1 overexpressing HepG2 cells were developed by transfection with lentiviral particles containing human CAV1 protein (Lenti-CAV1). Lenti-Control served as a negative control. Compared with BSA treatment, PA treatment of HepG2 cells for 24 hours increased the lipid droplets and TG level (P<0.01). Compared with negative control, overexpression of caveolin1 attenuated the accumulation of lipid droplets and triglyceride content in HepG2 cells (P<0.05). At the same time, quantitative real-time PCR revealed that the mRNA expression of PGC1α and sirt3 were increased in caveolin1 overexpressing cells (P<0.05).
In conclusion, caveolin1 may improve PA-induced hepatic steatosis through up-regulating PGC1α-sirt3 axis.
C. Lin: None. W. Zeng: None. S. Lin: None. K. Liu: None. L. Zeng: None.