English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/95606
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Melanocortin 4 receptor becomes an ACTH receptor by coexpression of melanocortin receptor accessory protein 2

AuthorsAgulleiro Gozalbo, Maria Josep ; Cortés, Raúl ; Fernández-Durán, Begoña ; Navarro, S. ; Guillot, Raúl ; Meimaridou, E.; Clark, A. J. L.; Cerdá-Reverter, José Miguel
Issue DateOct-2013
PublisherEndocrine Society
CitationMolecular Endocrinology 27: 1934-1945 (2013)
AbstractMelanocortin 2 receptor (MC2R) is the only canonical ACTH receptor. Its functional expression requires the presence of an accessory protein, known as melanocortin receptor 2 accessory protein 1 (MRAP1). The vertebrate genome exhibits a paralogue gene called MRAP2, which is duplicated in zebrafish (MRAP2a and MRAP2b), although its function remains unknown. In this paper, we demonstrate that MRAP2a enables MC4R, a canonical MSH receptor, to be activated by ACTH with a similar sensitivity to that exhibited by MC2R. Both proteins physically interact and are coexpressed in the neurons of the preoptic area, a key region in the control of the energy balance and hypophyseal secretion in fish. ACTH injections inhibit food intake in wild-type zebrafish but not in fish lacking functional MC4R. Both MRAP1 and MRAP2a are hormonally regulated, suggesting that these proteins are substrates for feed-back regulatory pathways of melanocortin signaling. Fasting has no effect on the central expression of MRAP2a but stimulates MRAP2b expression. This protein interacts and is colocalized with MC4R in the tuberal hypothalamic neurons but has no effect on the pharmacologic profile of MC4R. However, MRPA2b is able to decrease basal reporter activity in cell lines expressing MC4R. It is plausible that MRAP2b decreases the constitutive activity of the MC4R during fasting periods, driving the animal toward a positive energy balance. Our data indicate that MRAP2s control the activity of MC4R, opening up new pathways for the regulation of melanocortin signaling and, by extension, for the regulation of the energy balance and obesity. © 2013 by The Endocrine Society.
URIhttp://hdl.handle.net/10261/95606
DOI10.1210/me.2013-1099
Identifiersdoi: 10.1210/me.2013-1099
issn: 0888-8809
Appears in Collections:(IATS) Artículos
Files in This Item:
File Description SizeFormat 
melanocortin_receptor_acth.pdf1,48 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.