期刊
PEPTIDES
卷 90, 期 -, 页码 27-36出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.peptides.2017.02.003
关键词
Irisin; FNDC5; Orexin; Cart; BDNF; UCP; Goldfish; Food intake; mRNA expression
资金
- Natural Sciences and Engineering Research Council (NSERC) Discovery (DG) [261414-03]
- Undergraduate Student Research Awards (USRA)
- Memorial Undergraduate Career Experience Program (MUCEP)
Irisin is a peptide cleaved from the fibronectin type 111 domain containing protein 5 (FNDC5) gene that is secreted predominantly by muscle cells but also by other tissues including brain and intestine. In mammals, irisin has been shown to have thermogenic actions via the modulation of uncoupling proteins (UCPs) and to affect feeding and energy homeostasis via actions in brain, adipose tissue, liver, muscle and gastrointestinal tract. To examine the role of irisin on feeding and metabolism in fish, the effects of peripheral (intraperitoneal) injections of irisin on feeding behavior, glucose levels and the mRNA expressions of appetite regulators (cocaine and amphetamine regulated transcript CART, agouti related proteinAgRP, orexin), UCPs and lipoprotein lipase LPL and brain factors (brain-derived neurotrophic factor BDNF and tyrosine hydroxylase TH) were assessed in brain, white muscle and intestine. Irisin injections (100 ng/g) induced a decrease in food intake and increases in brain orexin, CART] and CART2, UCP2, BDNF, muscle UCP2 and intestine LPL mRNA expressions but did not affect blood glucose levels, brain AgRP, TH, UCP1, UCP3 and LPL or muscle UCP1. UCP3 and LPL expressions. A partial goldfish FNDC5 cDNA was isolated and the expressions of FDNC5, UCPs, LPL and BDNF were also compared between fed and fasted fish. Fasting induced decreases FNDC5 mRNA expression in the brain and intestine, but not in muscle. Fasting also induced increases in brain BDNF and LPL expressions and increases in UCP1, UCP2, UCP3 and LPL expressions in muscle. Our result suggest that irisin is an anorexigenic factor in fish and its actions might be in part mediated by appetite-regulating factors such as CART and orexins as well as UCP2 and brain factors such as BDNF. (C) 2017 Elsevier Inc. All rights reserved.
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