Linked Life Data

3117806

Source:http://linkedlifedata.com/resource/pubmed/id/3117806

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1987-12-17
pubmed:abstractText
We studied the consequences of infection of L6E9 myoblasts with T. cruzi on the adenylate cyclase complex to test the hypothesis that infection alters the functional properties of the guanine nucleotide regulatory proteins, Ns and Ni. Stimulating activities of adenylate cyclase due to isoproterenol, isoproterenol plus Gpp(NH)p, or forskolin (activities mediated by Ns) are not altered by infection. However, inhibitory activities mediated by Ni [Gpp(NH)p, acetylcholine, and adenosine inhibition of forskolin-dependent adenylate cyclase activity] are compromised by infection. The reduction in adenosine's inhibition of forskolin-dependent adenylate cyclase activity is seen throughout the effective concentration range of adenosine. Pertussis toxin does not change basal or stimulated adenylate cyclase activity in infected cells compared with normal uninfected cells, nor does it alter the inhibiting action of adenosine. To evaluate the coupling proteins (Ns and Ni) involved in the stimulation and inhibition of adenylate cyclase more directly, cholera- and pertussis-toxin-dependent ADP ribosylation studies were performed. The incorporation of [32P]ADP ribose in the presence (specific) or absence (nonspecific) of the toxins was markedly decreased in membranes prepared from infected cells. However, in membranes prepared from infected or uninfected cells previously treated with pertussis toxin, there was a significant reduction in specific pertussis-toxin dependent ADP ribosylation. The infection-associated diminution in toxin-dependent ADP ribosylation complements the impaired inhibition of adenylate cyclase data. Collectively, the data further substantiate an infection-associated alteration in the adenylate cyclase complex, probably at the level of the guanine nucleotide binding proteins.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0021-9541
pubmed:author
pubmed:issnType
Print
pubmed:volume
133
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
64-71
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
Infection of L6E9 myoblasts with Trypanosoma cruzi alters adenylate cyclase activity and guanine nucleotide binding proteins.
pubmed:affiliation
Department of Medicine, College of Physicians and Surgeons, Columbia University, New York, New York 10032.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.