Interactions of chemostimuli at the single cell level: studies in a model system.

Abstract:

:The responses of afferent chemosensory fibres of the carotid body to individual chemostimuli have long been established. However, the mechanisms underlying the multiplicative interactions of these stimuli (i.e. how the combined effects of hypoxia and hypercapnia exert a greater effect on afferent nerve discharge than the sum of their individual effects) have not been elucidated. Using the membrane hypothesis for carotid body chemoreception, in which chemostimuli inhibit type I cell K+ channels, leading to depolarization, voltage-gated Ca2+ entry and hence the triggering of exocytosis, this article considers data acquired in isolated type I carotid body cells and model chemoreceptor (PC12) cells to attempt to explain stimulus interactions. Whilst stimulus interactions are not clearly evident at the level of K+ channel inhibition or rises of [Ca2+]i, they are apparent at the level of transmitter release. Thus, it is clear that individual chemoreceptor cells can sense multiple stimuli, and that interactions of these stimuli can produce greater than additive effects in terms of transmitter release.

journal_name

Exp Physiol

journal_title

Experimental physiology

authors

Peers C

doi

10.1113/expphysiol.2003.002657

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

60-5

issue

1

eissn

0958-0670

issn

1469-445X

journal_volume

89

pub_type

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