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[Role of lipin-1 in the pathogenesis of alcoholic fatty liver disease].

Lipin-1 can promote the synthesis of triglyceride and fatty acid oxidation during lipid metabolism. Ethanol can up-regulate the expression of lipin-1 via the AMPK-SREBP-1-lipin-1 signaling pathway and increase lipin1β/αratio via the SITR1-SFRS10-LPIN1 signaling pathway. In the cytoplasm, lipin-1βfunctions as a Mg2+-dependent phosphatidic acid phosphohydrolase to accelerate the synthesis of triglyceride. In the nucleus, lipin-1αacts as a transcriptional coactivator and reduces mitochondrial fatty acid oxidation by inhibiting the activities of PPARαand PGC-1α, and therefore promotes lipid deposition in hepatocytes and causes hepatic steatosis.