Stress-induced redistribution of corticotropin-releasing factor receptor subtypes in the dorsal raphe nucleus.
Biol Psychiatry
; 66(1): 76-83, 2009 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-19362706
ABSTRACT
BACKGROUND:
The stress-related neuropeptide corticotropin-releasing factor (CRF) is involved in determining behavioral strategies for responding to stressors, in part through its regulation of the dorsal raphe (DR)-serotonin (5-HT) system. CRF(1) and CRF(2) receptor subtypes have opposing effects on this system that are associated with active versus passive coping strategies, respectively.METHODS:
Immunoelectron microscopy and in vivo single-unit recordings were used to assess CRF receptor distribution and neuronal responses, respectively, in the DR of stressed and unstressed rats.RESULTS:
Here we show that in unstressed rats CRF(1) and CRF(2) are differentially distributed within DR cells, with CRF(1) being prominent on the plasma membrane and CRF(2) being cytoplasmic. Stress experience reverses this distribution, such that CRF(2) is recruited to the plasma membrane and CRF(1) tends to internalize. As a consequence of this stress-induced cellular redistribution of CRF receptors, neuronal responses to CRF change from inhibition to a CRF(2)-mediated excitation.CONCLUSIONS:
Given evidence that CRF(1) and CRF(2) activation are associated with distinct behavioral responses to stress, the stress-triggered reversal in receptor localization provides a cellular mechanism for switching behavioral strategies for coping with stressors.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Estresse Psicológico
/
Núcleos da Rafe
/
Receptores de Hormônio Liberador da Corticotropina
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Biol Psychiatry
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Estados Unidos