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Knockdown of CTRP6 inhibits adipogenesis via lipogenic marker genes and Erk1/2 signalling pathway
Author(s) -
Wu Wenjing,
Mo Delin,
Zhao Cunzhen,
Zhao Chen,
Chen Yaosheng,
Pang Weijun,
Yang Gongshe
Publication year - 2015
Publication title -
cell biology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.932
H-Index - 77
eISSN - 1095-8355
pISSN - 1065-6995
DOI - 10.1002/cbin.10422
Subject(s) - adipogenesis , gene knockdown , lipogenesis , 3t3 l1 , adipose tissue , adipocyte , lipid droplet , adipose triglyceride lipase , biology , small interfering rna , fatty acid synthase , transfection , chemistry , microbiology and biotechnology , endocrinology , lipid metabolism , biochemistry , gene , lipolysis
C1q/tumor necrosis factor‐related protein 6 (CTRP6), an adipose‐tissue secretory factor, plays an important role in inflammatory reaction and carcinogenesis. However, the biological function of CTRP6 in adipogenesis remains unclear. In this study, we examined the effects of CTRP6 knockdown on lipogenesis of 3T3‐L1 adipocytes. The results showed that after 3T3‐L1 adipocytes transfected with anti‐CTRP6 small interfering RNA (siRNA), not only levels of secreted CTRP6 protein in the culture medium but also the expression level of the CTRP6 protein in the 3T3‐L1 adipocytes was significantly reduced ( P < 0.01). In addition, the number of lipid droplets in the adipocytes was reduced, as well as the OD values reflecting the fat content being significantly decreased ( P < 0.01). Meanwhile the levels of adipogenic markers, including peroxisome proliferator activated receptor γ (PPARγ), CCAAT/enhancer‐binding protein α (C/EBPα), CCAAT/enhancer‐binding protein β (C/EBPβ) and adipocyte fatty acid‐binding protein 4 (aP2), were decreased after treatment with anti‐CTRP6 siRNA, whereas the expression of adipose triglyceride lipase (ATGL) and triacylglycerol hydrolase (TGH) were increased. Furthermore, after transfection, activity of phosphorylated Erk1/2 (p‐Erk1/2) was inhibited in the early stage of differentiation, but in terminal differentiation of adipocytes, its activity was activated. Taken together, the results indicate that knockdown of CTRP6 can inhibit adipogenesis of 3T3‐L1 adipocytes through lipogenic marker genes and Erk1/2 signaling pathway.