Linked Life Data

2452949

Source:http://linkedlifedata.com/resource/pubmed/id/2452949

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
20
pubmed:dateCreated
1988-6-20
pubmed:abstractText
We have investigated the effects of clinically available calcium channel blockers (nifedipine, verapamil and diltiazem) on isoproterenol stimulated cyclic adenosine 3',5'-monophosphate (cyclic AMP) generation in intact human lymphocytes. After preincubation of various calcium antagonists with intact lymphocytes at 37 degrees C for 15 minutes, 10 microM nifedipine or verapamil partially inhibited isoproterenol induced cyclic AMP generation in the presence of cyclic AMP phosphodiesterase inhibitor (3-isobutyl-1-methylxanthine) while they alone had no effect on cyclic AMP level at a concentration of up to 100 microM. In contrast, 10 nM-1.0 microM nifedipine, verapamil or diltiazem potentiated cyclic AMP generation induced by isoproterenol in a dose dependent manner. Similar results were observed in the time course studies of cyclic AMP generation. These effects are somewhat similar to the effect of phenothiazine, a calmodulin inhibitor, which, at 10 microM (close to IC50), also potentiated the effects of isoproterenol. In contrast, lanthanum chloride (LaCl3), an extracellular inorganic calcium antagonist, at 1.0 mM, inhibited isoproterenol induced cyclic AMP generation. The biochemical mechanisms underlying these potentiating effects are unknown. It may be partly related to the effect of calcium channel blockers (at least for nifedipine) on preventing beta 2 adrenergic receptor desensitization. This may provide a potential mechanism for the synergistic effect between calcium channel blockers and beta 2 adrenoceptor agonists on bronchial dilatation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0024-3205
pubmed:author
pubmed:issnType
Print
pubmed:volume
42
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2037-45
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1988
pubmed:articleTitle
The effects of calcium channel blockers on isoproterenol induced cyclic adenosine 3',5'-monophosphate generation in intact human lymphocytes.
pubmed:affiliation
Department of Medicine, School of Medicine, University of California, Los Angeles 90024.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't