Linked Life Data

15036623

Source:http://linkedlifedata.com/resource/pubmed/id/15036623

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2004-3-23
pubmed:abstractText
We have investigated the effect of blockade of G(i/o) proteins on the electrical activity of S-myenteric neurons from guinea-pig ileum longitudinal muscle-myenteric plexus preparations. Intracellular recordings were made from either control or pertussis toxin (PTX) treated tissues. PTX is known to disrupt the function of G(i/o) proteins. Incubation with PTX (300 ng/ml) induced three main changes in the electrophysiological characteristics of S-neurons: (1) resting membrane potential was more depolarised; (2) fast excitatory postsynaptic potentials (EPSPs) were faster and narrower; and (3) spontaneous fast EPSPs and action potentials were more frequent. Amplitude of slow EPSPs was not modified. This general increase in excitability after blockade of G(i/o) proteins shares characteristics with the slow depolarisation induced by long-lasting trains of low-frequency electrical stimulation and could be mediated by similar mechanisms. Electrophysiological activity of S-myenteric neurons could be modulated by an inhibitory tone, which PTX could modify by either pre- or post-synaptic mechanisms, such as inhibition of the tonic release of inhibitory neurotransmitters and/or intracellular signal transduction involving PTX-sensitive G(i/o) proteins.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0304-3940
pubmed:author
pubmed:issnType
Print
pubmed:day
19
pubmed:volume
356
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
175-8
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Blockade of Gi/o proteins modifies electrical activity of S-myenteric neurons from guinea-pig ileum.
pubmed:affiliation
Area Farmacología, Depto. Ciencias de la Salud, Facultad de Ciencias de la Salud, Universidad Rey Juan Carlos, Avda. de Atenas s/n, 28922 Alcorcón, Madrid, Spain.
pubmed:publicationType
Journal Article, Comparative Study, In Vitro