Evidence that inhibitory motor neurons of the guinea-pig small intestine exhibit fast excitatory synaptic potentials mediated via P2X receptors.

Abstract:

:Intracellular recordings were used to study the contribution of nicotinic and P2X receptors to synaptic transmission to morphologically identified myenteric neurons of guinea-pig ileum. Hexamethonium (100 microM) abolished fast excitatory synaptic potentials (EPSPs) in all orally projecting neurons, but fast EPSPs in anally projecting neurons were resistant to this antagonist. The non-cholinergic fast EPSPs were virtually abolished by suramin (100 microM). This suggests that P2X receptors are important in descending motility reflexes. However, suramin and hexamethonium together did not affect descending inhibitory reflexes when applied to the site of transmission between interneurons in this pathway. These data suggest that P2X receptors are not involved in transmission between descending interneurons, but may be important for transmission to inhibitory motor neurons.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Johnson PJ,Shum OR,Thornton PD,Bornstein JC

doi

10.1016/s0304-3940(99)00275-x

keywords:

subject

Has Abstract

pub_date

1999-05-14 00:00:00

pages

169-72

issue

3

eissn

0304-3940

issn

1872-7972

pii

S030439409900275X

journal_volume

266

pub_type

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