Inhibition of Ca2+ channels and adrenal catecholamine release by G protein coupled receptors

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

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 βγ heterodimers (Gβγ) 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 Gβγ on the exocytotic machinery and how this might fine tune neuroendocrine secretion are also discussed.

Original languageEnglish (US)
Pages (from-to)1201-1208
Number of pages8
JournalCellular and Molecular Neurobiology
Volume30
Issue number8
DOIs
StatePublished - Nov 2010

All Science Journal Classification (ASJC) codes

  • Cellular and Molecular Neuroscience
  • Cell Biology

Fingerprint Dive into the research topics of 'Inhibition of Ca<sup>2+</sup> channels and adrenal catecholamine release by G protein coupled receptors'. Together they form a unique fingerprint.

Cite this