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Título del libro: Hormones And Behavior
Título del capítulo: Inhibited TRHergic pathway of amygdala and insular cortex may participate in high anxiety levels and decreased food intake of dehydrated-induced anorexic rats

Autores UNAM:
PATRICIA BERTHA JUDITH DE GORTARI GALLARDO; ELENA ALVAREZ SALAS; ELIZABETH LORRAINE JAIMES HOY;
Autores externos:

Idioma:

Año de publicación:
2013
Resumen:

Thyrotropin-releasing hormone (TRH), a tripeptide synthesized in the paraventricular nucleus (PVN) of the hypothalamus and in other brain regions, is proposed with neuromodulatory functions implicated in anorexic and anxiolytic effects. Female rats, subjected to the dehydration-induced anorexia model (DIA) (drinking 2.5% NaCl solution for 7 days), present increased proTRH expression in anterior part of the PVN and inhibition of food intake, when compared to controls drinking tap water or to a pair-fed group (forced-food restricted, FFR), which eats the exact amount of food than DIA rats. DIA animals avoid food in spite of their weight loss probably due to the sensorial attributes of the NaCl solution. Thus, we evaluated here the activity of the TRHergic pathway in the insular cortex (IC), involved in the perception of the sensorial characteristics of food to define whether TRH in this region is altered and perhaps participates in the inhibited feeding of DIA rats. DIA rats increase anxiety-like conduct when subjected to the defensive-burying behavioral test. Thus, we also tried to evaluate the participation of the amygdaloid TRHergic pathway in the increased anxiety scores of DIA animals by measuring mRNA levels of proTRH and TRH-R1, as well as TRH content in the same region, and compared these values to those of control and FFR groups of rats; we also measured proCRH expression due to its anxiogenic role. Our results suggest that the unadapted amygdaloid CRH and GR expression along with an altered TRHergic pathway of amygdala and IC in DIA animals may be participating in high anxiety levels and aberrant feeding behavior in these animals. © 2013 by Nova Science Publishers, Inc. All rights reserved.


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