title: Molecular and physiological evidences for the role in appetite regulation of apelin and its receptor APJ in Ya-fish (Schizothorax prenanti).
abstract: Apelin is a recently discovered peptide produced by several tissues with diverse physiological actions mediated by its receptor APJ. In order to better understand the role of apelin in the regulation of appetite in fish, we cloned the cDNAs encoding apelin and APJ, and investigated their mRNA distributions in Ya-fish (Schizothorax prenanti) tissues. We also assessed the effects of different nutritional status on apelin and APJ mRNAs abundance. Apelin and APJ mRNAs were ubiquitously expressed in all tissues tested, relatively high expression levels were detected in the heart, spleen, hypothalamus and kidney. Short-term fasting significant increased APJ mRNA expression, but no significant difference between fasted fish and fed control on 5- and 7-day. Meanwhile, apelin mRNA expression consistently increased during the 7-day food deprivation. In order to further characterize apelin in fish, we performed intraperitoneal (i.p.) injection of apelin-13 and examined food intake of the injected fish. Apelin injected at a dose of 100 ng/g body weight induced a significant increase in food intake compared to saline injected fish. Our results suggest that apelin acts as an orexigenic factor in Ya-fish. Their widespread distributions also suggest that apelin and APJ might play multiple physiological regulating roles in fish.
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Fangjun
authors.initials: F
authors.lastname: Lin
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Wu
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Hu
authors.initials: H
authors.lastname: Chen
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Xin
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Dengyue
authors.initials: D
authors.lastname: Yuan
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Ju
authors.initials: J
authors.lastname: Liu
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Yundi
authors.initials: Y
authors.lastname: Gao
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Chaowei
authors.initials: C
authors.lastname: Zhou
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Rongbin
authors.initials: R
authors.lastname: Wei
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Defang
authors.initials: D
authors.lastname: Chen
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Shiyong
authors.initials: S
authors.lastname: Yang
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China.
authors.forename: Yundan
authors.initials: Y
authors.lastname: Pu
authors.affiliation: Department of Aquaculture, College of Animal Science and Technology, Sichuan Agricultural University, 46# Xinkang Road, Ya'an, China. Electronic address: lizhiqiong454@163.com.
authors.forename: Zhiqiong
authors.initials: Z
authors.lastname: Li
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001066:Appetite / Q000235:genetics*; D001069:Appetite Regulation / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D004435:Eating / Q000187:drug effects / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005215:Fasting; D005399:Fishes / Q000145:classification / Q000235:genetics* / Q000378:metabolism; D005508:Food Deprivation; D005786:Gene Expression Regulation; D007031:Hypothalamus / Q000378:metabolism; D007274:Injections, Intraperitoneal; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics* / Q000378:metabolism / Q000494:pharmacology; D007668:Kidney / Q000378:metabolism; D008969:Molecular Sequence Data; D009206:Myocardium / Q000378:metabolism; D010802:Phylogeny; D012333:RNA, Messenger / Q000235:genetics* / Q000378:metabolism; D043562:Receptors, G-Protein-Coupled / Q000235:genetics* / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013154:Spleen / Q000378:metabolism
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D043562:Receptors, G-Protein-Coupled; D011994:Recombinant Proteins
keywords: APJ; Apelin; Cloning; Food intake; Tissue distribution; Ya-fish