Influence of anterodorsal thalamic nuclei on the hypophyseal-adrenal axis and cardiac beta receptors in rats submitted to variable chronic stress.
Acta Physiol Pharmacol Ther Latinoam
; 49(2): 71-8, 1999.
Article
em En
| MEDLINE
| ID: mdl-10797843
The limbic structures play an important role in the control of the neuroendocrine and sympathical adrenal function in basal and stress conditions. This work was undertaken to evaluate plasma ACTH, adrenocortical activity, cardiac adrenoceptors density and affinity response to variable chronic stress (VCS) in anterodorsal thalamic nuclei (ADTN) lesioned rats. Thirty days after lesion, shamlesioned stressed animals increased plasma ACTH and corticosterone as compared to sham-lesioned unstressed animals (p < 0.05); lesioned rats increased ACTH levels after VCS (p < 0.05) as compared to unstressed-lesioned rats. Whereas in sham-lesion plasma corticosterone (C) increased after stress, in lesioned animals(C) remained unchanged as compared to unstressed-lesioned animals. In the stressed groups, adrenal C contents were below those found in unstressed rats. beta-receptors affinity, in all the experimental groups, was similar, but VCS sham-lesioned animals underwent a significant increase in cardiac D-adrenergic receptors density when compared with basal and lesioned groups (P < 0.001). Our findings would demonstrate that the increment in cardiac beta adrenoceptors density appears as a consequence of the increase in ACTH, plasma corticosterone and sympathetic response provoked by chronic stress situations. ADTN lesion attenuated this hipophisoadrenal system response to chronic stress as well as the above mentioned cardiac beta adrenoceptors density increment.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Estresse Fisiológico
/
Corticosterona
/
Receptores Adrenérgicos beta
/
Hormônio Adrenocorticotrópico
/
Núcleos Anteriores do Tálamo
/
Miocárdio
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Acta Physiol Pharmacol Ther Latinoam
Assunto da revista:
FARMACOLOGIA
/
FISIOLOGIA
/
TERAPEUTICA
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
Argentina
País de publicação:
Argentina