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Hypothalamic TRH mediates anorectic effects of serotonin in rats

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Chávez, Jorge, Alcántara-Alonso, Viridiana, García-Luna, Cinthia, Soberanes-Chávez, Paulina, Grammatopoulos, Dimitris and de Gortari, Patricia (2022) Hypothalamic TRH mediates anorectic effects of serotonin in rats. eNeuro, 9 (3). 0077-22.2022. doi:10.1523/ENEURO.0077-22.2022 ISSN 2373-2822. [ 🗎 Public]. [ (🔓): Yes ].

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Official URL: https://doi.org/10.1523/ENEURO.0077-22.2022

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Abstract

Among the modulatory functions of thyrotropin-releasing hormone (TRH), an anorectic behavior in rodents is observed when centrally injected. Hypothalamic PVN neurons receive serotonergic inputs from dorsal raphe nucleus and express serotonin (5HT) receptors such as 5HT , 5HT , 5HT , which are involved in 5HT-induced feeding regulation. Rats subjected to dehydration-induced anorexia (DIA) model show increased PVN TRH mRNA expression, associated with their decreased food intake. We analyzed whether 5HT input is implicated in the enhanced PVN TRH transcription that anorectic rats exhibit, given that 5HT increases TRH expression and release when studied By using mHypoA-2/30 hypothalamic cell cultures, we found that 5HT stimulated TRH mRNA, pCREB and pERK1/2 levels. By inhibiting basal PKA or PKC activities or those induced by 5HT, pCREB or pERK1/2 content did not increase suggesting involvement of both kinases in their phosphorylation. 5HT effect on TRH mRNA was not affected by PKA inhibition, but it diminished in the presence of PKCi suggesting involvement of PKC in 5HT-induced TRH increased transcription. This likely involves 5HT and the activation of alternative transduction pathways than those studied here. In agreement with the data, we found that injecting 5HT antagonists into the PVN of DIA rats reversed the increased TRH expression of anorectic animals, as well as their decreased food intake; also, the agonist reduced food intake of hungry restricted animals along with elevated PVN TRH mRNA levels. Our results support that the anorectic effects of serotonin are mediated by PVN TRH in this model. Interaction between brain peptides and neurotransmitters' pathways regulates feeding behavior, but when altered it could lead to the development of eating disorders, such as anorexia. An abnormal increased TRH expression in hypothalamic PVN results in dehydration-induced anorectic rats, associated to their low food intake. The role of neurotransmitters in that alteration is unknown, and since serotonin inhibits feeding and has receptors in PVN, we analyzed its participation in increasing TRH expression and reducing feeding in anorectic rats. By antagonizing PVN serotonin receptors in anorectic rats, we identify decreased TRH expression and increased feeding, suggesting that the anorectic effects of serotonin are mediated by PVN TRH. Elucidating brain networks involved in feeding regulation would help to design therapies for eating disorders. [Abstract copyright: Copyright © 2022 Chávez et al.]

Item Type: Journal Article
Subjects: Q Science > QP Physiology
R Medicine > RC Internal medicine
Divisions: Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Biomedical Sciences
Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Biomedical Sciences > Translational & Experimental Medicine
Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): Anorexia nervosa, Serotonin, Thyrotropin releasing factor, Eating disorders -- Animal models, Anorexia nervosa -- Animal models, Brain -- Pathophysiology
Journal or Publication Title: eNeuro
Publisher: Society for Neuroscience
ISSN: 2373-2822
Official Date: 11 May 2022
Dates:
DateEvent
11 May 2022Published
28 April 2022Accepted
Volume: 9
Number: 3
Article Number: 0077-22.2022
DOI: 10.1523/ENEURO.0077-22.2022
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 4 November 2022
Date of first compliant Open Access: 4 November 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
233918Consejo Nacional de Ciencia y TecnologíaUNSPECIFIED

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