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Diabetes and many other metabolism syndromes are closely related to obesity. To reveal the underlying mechanism of fat deposition, an increasing number of studies are focusing on the functions of miRNAs during adipocytes development. Previous studies have proved that miR-15a/b play important roles in multiple physiological processes; however, their functions during adipogenesis remain unclear. To reveal this, we detected the expression profiles of miR-15a/b during adipogenesis in porcine pre-adipocyte, and found that their expression levels increased in the early stage of adipocyte differentiation and dropped after day 4. Moreover, over-expression of miR-15a/b in porcine pre-adipocytes promoted adipocyte differentiation and lipid accumulation. Target genes of miR-15a/b were predicted and examined, which revealed that Forkhead box protein O1 (FoxO1) is the target gene of miR-15a/b. The inhibition of FoxO1 expression level caused by miR-15a/b over-expression had a positive effect on adipogenesis. Thus, we conclude that miR-15a/b promote adipogenesis in porcine pre-adipocyte via repressing FoxO1.

MiR-15a/b promote adipogenesis in porcine pre-adipocyte via repressing FoxO1