FGF1 promotes the differentiation of goat intramuscular and subcutaneous preadipocytes

Fibroblast growth factor 1(FGF1) has been proved to bind to specific signal molecules and activate intracellular signal transduction, leading to proliferation or differentiation of cells. However, the role of FGF1 in goat adipocytes is still unclear. Here, we investigated its role in lipogenesis of goats, which depends on the activation of FGFRs. In goat intramuscular and subcutaneous adipocytes, we observed that adipocytes accumulation was inhibited by interfering of FGF1, the expression of C/EBPα, C/EBPβ, LPL, Pref-1, PPARγ, AP2, KLF4, KLF6, KLF10 and KLF17 were significantly down-regulated (p < 0.05). When the FGF1 was up-regulated, the opposite result was found, while the expression of C/EBPβ, LPL, PPARγ, SREBP1, AP2, KLF4, KLF7, KLF15, KLF16 and KLF17 were increased significantly (p < 0.05) in goat intramuscular and subcutaneous adipocytes. The expression level of FGFR1 was significantly and decreased with the interference of FGF1, and increased with the overexpression of FGF1. But in goat subcutaneous adipocytes, only the expression of FGFR2 was consistent with the expression of FGF1. Interference methods confirmed that FGFR1 or FGFR2 and FGF1 have the similarly promoting function in adipocytes differentiation. With the co-transfection technology, we confirmed that FGF1 promoted the differentiation of intramuscular and subcutaneous adipocytes might via FGFR1 or FGFR2, respectively.