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Molecular characterization of fibroblast growth factor-16 and its role in promoting the differentiation of intramuscular preadipocytes in goat

Published online by Cambridge University Press:  22 June 2020

K. Huang ,
J. J. Liang ,
Y. Q. Lin ,
J. J. Zhu ,
J. Q. Ma  and
Y. Wang
K. Huang
Affiliation:
College of Life Science and Technology, Southwest Minzu University, 610041, Chengdu, Sichuan, China Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, 610041, Chengdu, Sichuan, China
J. J. Liang
Affiliation:
College of Life Science and Technology, Southwest Minzu University, 610041, Chengdu, Sichuan, China Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, 610041, Chengdu, Sichuan, China
Y. Q. Lin
Affiliation:
College of Life Science and Technology, Southwest Minzu University, 610041, Chengdu, Sichuan, China Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, 610041, Chengdu, Sichuan, China
J. J. Zhu
Affiliation:
College of Life Science and Technology, Southwest Minzu University, 610041, Chengdu, Sichuan, China Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, 610041, Chengdu, Sichuan, China Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, 610041, Chengdu, Sichuan, China
J. Q. Ma
Affiliation:
College of Life Science and Technology, Southwest Minzu University, 610041, Chengdu, Sichuan, China Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, 610041, Chengdu, Sichuan, China
Y. Wang*
Affiliation:
College of Life Science and Technology, Southwest Minzu University, 610041, Chengdu, Sichuan, China Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Southwest Minzu University, 610041, Chengdu, Sichuan, China Key Laboratory of Sichuan Province for Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Exploitation, Southwest Minzu University, 610041, Chengdu, Sichuan, China
*
†E-mail: wangyong010101@hotmail.com
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Abstract

Fat metabolism is an important and complex biochemical reaction in vivo and is regulated by many factors. Recently, the findings on high expression of fibroblast growth factor-16 (FGF16) in brown adipose tissue have led to an interest in exploring its role in lipogenesis and lipid metabolism. The study cloned the goat’s FGF16 gene 624 bp long, including the complete open reading frame that encodes 207 amino acids. We found that FGF16 expression is highest in goat kidneys and hearts, followed by subcutaneous fat and triceps. Moreover, the expression of FGF16 reached its peak on the 2nd day of adipocyte differentiation (P < 0.01) and then decreased significantly. We used overexpression and interference to study the function of FGF16 gene in goat intramuscular preadipocytes. Silencing of FGF16 decreased adipocytes lipid droplet aggregation and triglyceride synthesis. This is in contrast to the situation where FGF16 is overexpressed. Furthermore, knockdown of FGF16 also caused down-regulated expression of genes associated with adipocyte differentiation including CCAAT enhancer-binding protein beta (P < 0.01), fatty acid-binding protein-2 (P < 0.01) and sterol regulatory element binding protein-1 (P < 0.05), but the preadipocyte factor-1 was up-regulated. At the same time, the genes adipose triglyceride lipase (P < 0.01) and hormone-sensitive lipase (P < 0.05) associated with triglyceride breakdown were highly expressed. Next, we locked the fibroblast growth factor receptor-4 (FGFR4) through the protein interaction network and interfering with FGF16 to significantly reduce FGFR4 expression. It was found that the expression profile of FGFR4 in adipocyte differentiation was highly similar to that of FGF16. Overexpression and interference methods confirmed that FGFR4 and FGF16 have the same promoting function in adipocyte differentiation. Finally, using co-transfection technology, pc-FGF16 and siRNA-FGFR4, siRNA2-FGF16 and siRNA-FGFR4 were combined to treat adipocytes separately. It was found that in the case of overexpression of FGF16, cell lipid secretion and triglyceride synthesis showed a trend of first increase and then decrease with increasing interference concentration. In the case of interference with FGF16, lipid secretion and triglyceride synthesis showed a downward trend with the increase of interference concentration. These findings illustrated that FGF16 mediates adipocyte differentiation via receptor FGFR4 expression and contributed to further study of the functional role of FGF16 in goat fat formation.

Keywords

adipocyteclonefibroblast growth factor receptor-4regulationtriglyceride
Type
Research Article
Information
animal , Volume 14 , Issue 11 , November 2020 , pp. 2351 - 2362
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of The Animal Consortium

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