Linked Life Data

1326437

Source:http://linkedlifedata.com/resource/pubmed/id/1326437

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1992-10-19
pubmed:abstractText
Conventional intracellular recording techniques were used to investigate actions of adenosine on nicotinic cholinergic transmission in myenteric neurons of the gastric antrum. Adenosine or the more potent derivatives, 5'-N-ethylcarboxamidoadenosine (NECA), 5'-N-cyclopropylcarboxamidoadenosine, 1-deaza-2-chloro-N6-cyclopentyladenosine or N6-cyclopentyladenosine reversibly and dose dependently inhibited the fast excitatory postsynaptic potentials (fast EPSPs) in 60% of the gastric neurons. Neither adenosine nor NECA affected excitatory responses to the nicotinic agonist 1,1-dimethyl-4-phenyl-piperazinium iodine. The EC50 concentration for inhibition of the fast excitatory postsynaptic potential (EPSP) by adenosine was 55 microM NECA was a more potent inhibitor than adenosine. The specific adenosine receptor antagonists 1,3-dipropyl-8-p-sulfophenyl xanthine or 1,3-dipropyl-8-(cyclopentyl) xanthine blocked the inhibitory effects of adenosine or NECA. Fast EPSPs were enhanced by superfusion of the antagonists alone, suggestive of ongoing inhibition of nicotinic transmission by endogenous adenosine. The antagonists had no effect on resting membrane properties, excitability or antidromic action potentials. In neurons with suppression of fast EPSPs, adenosine did not suppress all cholinergic inputs to the same neuron. The results suggest that adenosine inhibits nicotinic transmission by interacting with presynaptic P1 adenosine receptors located at cholinergic release sites.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0014-2999
pubmed:author
pubmed:issnType
Print
pubmed:day
27
pubmed:volume
216
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
17-22
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Suppression of nicotinic synaptic transmission by adenosine in myenteric ganglia of the guinea-pig gastric antrum.
pubmed:affiliation
Department of Physiology, College of Medicine, Ohio State University, Columbus 43210.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't