Inhibition of Ca2+ channels and adrenal catecholamine release by G protein coupled receptors.
Cell Mol Neurobiol
; 30(8): 1201-8, 2010 Nov.
Article
en En
| MEDLINE
| ID: mdl-21061161
ABSTRACT
Catecholamines and other transmitters released from adrenal chromaffin cells play central roles in the "fight-or-flight" response and exert profound effects on cardiovascular, endocrine, immune, and nervous system function. As such, precise regulation of chromaffin cell exocytosis is key to maintaining normal physiological function and appropriate responsiveness to acute stress. Chromaffin cells express a number of different G protein coupled receptors (GPCRs) that sense the local environment and orchestrate this precise control of transmitter release. The primary trigger for catecholamine release is Ca2+ entry through voltage-gated Ca2+ channels, so it makes sense that these channels are subject to complex regulation by GPCRs. In particular G protein ßγ heterodimers (Gbc) bind to and inhibit Ca2+ channels. Here I review the mechanisms by which GPCRs inhibit Ca2+ channels in chromaffin cells and how this might be altered by cellular context. This is related to the potent autocrine inhibition of Ca2+ entry and transmitter release seen in chromaffin cells. Recent data that implicate an additional inhibitory target of Gßγ on the exocytotic machinery and how this might fine tune neuroendocrine secretion are also discussed.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Canales de Calcio
/
Catecolaminas
/
Glándulas Suprarrenales
/
Receptores Acoplados a Proteínas G
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Cell Mol Neurobiol
Año:
2010
Tipo del documento:
Article
País de afiliación:
Estados Unidos