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Gene Location, Expression, and Function of FNDC5 in Meishan Pigs

Chunbo Cai,Gao-jun Xiao,L. Qian,Shengwang Jiang,Biao Li,Shan-shan Xie,Ting Gao,X. An,W. Cui,Kui Li

Published 2017 in Scientific Reports

ABSTRACT

Irisin is a new muscular regulatory factor that is generated by the cleavage of its precursor protein fibronectin type III domain-containing protein 5 (FNDC5). Irisin promotes fat consumption due to its stimulatory role in the browning of the adipocytes in mice. Currently, there is no report on FNDC5 functions in pigs as model animals. In this study, we investigated the expression patterns and functions of FNDC5 in Meishan pigs. Our results showed that FNDC5 gene in Meishan pigs contains five transcripts, all of which can be translated into functional intact irisin proteins. Porcine FNDC5 is mainly expressed in skeletal muscle, with the expression level being significantly higher during the embryonic and juvenile periods than in the adulthood stage. In vitro study showed that FNDC5 stimulates the proliferation and adipogenic differentiation of primary adipocytes isolated from Meishan pigs, and FNDC5 enhances the expression of browning marker genes during adipogenic differentiation. Our study was the first report on FNDC5 expression patterns and functions in pigs. Data from this study provide valuable information related to the study on FNDC5 functions and future development of novel treatment for obesity.

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