Publication:
Descending inhibitory reflexes involve P2X receptor-mediated transmission from interneurons to motor neurons in guinea-pig ileum

dc.contributor.author Bian, X.-C. en_US
dc.contributor.author Bertrand, Paul P. en_US
dc.contributor.author Bornstein, J. C. en_US
dc.date.accessioned 2021-11-25T13:36:00Z
dc.date.available 2021-11-25T13:36:00Z
dc.date.issued 2000 en_US
dc.description.abstract 1. The role of P2X receptors in descending inhibitory reflexes evoked by distension or mucosal distortion in the guinea-pig ileum was studied using intracellular recording from the circular muscle in a two-chambered organ bath. This allowed separate superfusion of the sites of reflex stimulation and recording, thereby allowing drugs to be selectively applied to different parts of the reflex pathway. 2. Inhibitory junction potentials (IJPs) evoked by electrical field stimulation (EFS) in the recording chamber were compared with those evoked during reflexes to control for effects of P2 receptor antagonists on neuromuscular transmission. 3. The P2 receptor antagonists suramin (100 µM) and pyridoxal phosphate-6-azophenyl-2',4'-disulphonic acid (10 and 60 µM; PPADS), when added to the recording chamber, depressed reflexly evoked IJPs significantly more than those evoked by EFS. In particular, 10 µM PPADS depressed IJPs evoked by distension or mucosal distortion by about 50 %, but had little effect on IJPs evoked by EFS. 4. Blockade of synaptic transmission in the stimulation chamber with a low Ca2+-high Mg2+ solution depressed, but did not abolish, IJPs evoked by distension. The residual reflex IJPs were unaffected by PPADS (10 µM), hyoscine (1 µM), hyoscine plus hexamethonium (200 µM), or hysocine plus hexamethonium plus PPADS in the recording chamber. 5. We conclude that P2X receptors are important for synaptic transmission from descending interneurons to inhibitory motor neurons in descending inhibitory reflex pathways of guinea-pig ileum. Transmission from anally directed axons of distension-sensitive intrinsic sensory neurons to inhibitory motor neurons is unlikely to involve P2X, muscarinic or nicotinic receptors. en_US
dc.identifier.issn 0022-3751 en_US
dc.identifier.uri http://hdl.handle.net/1959.4/40079
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/3.0/au/ en_US
dc.source Legacy MARC en_US
dc.title Descending inhibitory reflexes involve P2X receptor-mediated transmission from interneurons to motor neurons in guinea-pig ileum en_US
dc.type Journal Article en
dcterms.accessRights open access
dspace.entity.type Publication en_US
unsw.accessRights.uri https://purl.org/coar/access_right/c_abf2
unsw.description.publisherStatement The definitive version is available at www3.interscience.wiley.com en_US
unsw.identifier.doiPublisher http://dx.doi.org/10.1111/j.1469-7793.2000.00551.x en_US
unsw.relation.faculty Medicine & Health
unsw.relation.ispartofjournal Journal of Physiology en_US
unsw.relation.ispartofpagefrompageto 551-560 en_US
unsw.relation.ispartofvolume 528 en_US
unsw.relation.originalPublicationAffiliation Bian, X.-C. en_US
unsw.relation.originalPublicationAffiliation Bertrand, Paul P., Medical Sciences, Faculty of Medicine, UNSW en_US
unsw.relation.originalPublicationAffiliation Bornstein, J. C. en_US
unsw.relation.school School of Medical Sciences *
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