Linked Life Data

6300378

Source:http://linkedlifedata.com/resource/pubmed/id/6300378

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1983-5-5
pubmed:abstractText
1. The informational role of cytosolic Ca2+ appears to be mediated by a ubiquitous protein--calmodulin--in most cell systems. 2. Evidence has been accumulating that not only cAMP, but also Ca2+, behaves as an intracellular messenger in the stimulation of water transport by vasopressin (hydrosmotic effect). 3. To examine whether calmodulin plays a role in the hydrosmotic effect of vasopressin, we used a specific antagonist of calmodulin--trifluoperazine--and looked at its effects on water transport in the urinary bladder of toads Bufo marinus. 4. The results showed that trifluoperazine, at micromolar concentrations, blocked the hydrosmotic effects of vasopressin or cAMP, thus indicating a post-cAMP site of action. 5. Two other psychotropic drugs--amitriptyline and harmaline--had similar effects, but higher concentrations were required to induce the same degree of inhibition of water flow. 6. Calmodulin was detected in the membrane and in the cytosolic fractions of isolated epithelial cells of toad bladder by means of the phosphodiesterase test. The content of both fractions was similar to that found in bovine brain. 7. The results suggest that calmodulin plays a regulatory role in the hydrosmotic action of vasopressin by possibly interacting with proteins associated with microfilaments and/or microtubules.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0021-7948
pubmed:author
pubmed:issnType
Print
pubmed:volume
78
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
270-8
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1982
pubmed:articleTitle
Evidence for a role of calmodulin in the hydrosmotic action of vasopressin in toad bladder.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't