Document Detail


Peripheral injections of cholecystokinin, apelin, ghrelin and orexin in cavefish (Astyanax fasciatus mexicanus): Effects on feeding and on the brain expression levels of tyrosine hydroxylase, mechanistic target of rapamycin and appetite-related hormones.
MedLine Citation:
PMID:  24287340     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The effects of intraperitoneal injections of cholecystokinin(CCK), apelin, ghrelin and orexin on food intake were examined in the blind cavefish Astyanax fasciatus mexicanus. CCK (50 ng/g) induced a decrease in food intake whereas apelin (100 ng/g), orexin (100 ng/g) and ghrelin (100 ng/g) induced an increase in food intake as compared to saline-injected control fish. In order to better understand the central mechanism by which these hormones act, we examined the effects of injections on the brain mRNA expression of two metabolic enzymes, tyrosine hydroxylase (TH) and mechanistic target of rapamycin (mTOR), and of appetite-regulating peptides, CCK, orexin, apelin and cocaine and amphetamine regulated transcript (CART). CCK injections induced a decrease in brain apelin injections, apelin injections induced an increase in TH, mTOR and orexin brain expressions, orexin treatment increased brain TH expression and ghrelin injections induced an increase in mTOR and orexin brain expressions. CART expression was not affected by any of the injection treatments. Our results suggest that the enzymes TH and mTOR and the hormones CCK, apelin, orexin and ghrelin all regulate food intake in cavefish through a complex network of interactions.
Authors:
Carla C Penney; Hélène Volkoff
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-11-25
Journal Detail:
Title:  General and comparative endocrinology     Volume:  -     ISSN:  1095-6840     ISO Abbreviation:  Gen. Comp. Endocrinol.     Publication Date:  2013 Nov 
Date Detail:
Created Date:  2013-11-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370735     Medline TA:  Gen Comp Endocrinol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013. Published by Elsevier Inc.
Affiliation:
Departments of Biology and Biochemistry, Memorial University of Newfoundland, St. John's, NL A1B 3X9, Canada.
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