AMP-activated protein kinase (AMPK) is a key regulator of fatty acid biosynthesis and fatty acid oxidation throughout the body. Piperlongumine (PL) isolated from Piper longum (L.) was shown to potently upregulate activation of AMPK via phosphorylation and inactivation of acetyl-CoA carboxylases in cultured HepG2 cells, presumably enhancing the transfer of fatty acids into mitochondrial cells by inhibiting malonyl-CoA production. PL showed cytotoxicity on HepG2 cell growth at the concentration of 5 μM of PL, while more than 80% of HepG2 cells were survived at the concentration of 2 μM of PL. Overall, the results of this study indicate that PL activates AMPK phosphorylation and possesses cytotoxicity in HepG2 cells.
Keywords: AMP-activated protein kinase; HepG2 cell; phosphorylation; piperlongumine.