Linked Life Data

2157978

Source:http://linkedlifedata.com/resource/pubmed/id/2157978

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1990-5-16
pubmed:abstractText
Although it is clear that cAMP is an important mediator of the actions of LH/CG in Leydig cells, recent studies from several laboratories have shown that the functions of Leydig cells can also be modulated by hormones and growth factors that do not appear to use cAMP as a second messenger. Thus, in order to increase our understanding of the importance of cAMP as a modulator of the functions of Leydig cells we have used a genetic approach to establish permanent cell lines that express a cAMP-resistant phenotype. MA-10 cells, a clonal strain of cultured Leydig tumor cells that express many of the characteristics of normal Leydig cells, were transfected with an expression vector controlled by the metallothionein promoter and encoding for a mutant form of the regulatory subunit of the type I cAMP-dependent protein kinase. Three stable transfectants that display a Zn+2-dependent decrease in cAMP-dependent protein kinase activity were established. Further characterization of one of the transfectants (designated MA-10(K3)) revealed a parallel reduction in the ability of cAMP and human CG to induce cell rounding, to increase steroid synthesis, or to induce c-fos mRNA. Our initial studies on these mutant cells have already provided novel information about the actions of human CG. These cell lines will also be valuable for further studies on the signaling systems that mediate hormone action in Leydig cells.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0888-8809
pubmed:author
pubmed:issnType
Print
pubmed:volume
4
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
80-90
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1990
pubmed:articleTitle
Reduced gonadotropin responses in a novel clonal strain of Leydig tumor cells established by transfection of MA-10 cells with a mutant gene of the type I regulatory subunit of the cAMP-dependent protein kinase.
pubmed:affiliation
Population Council, New York, New York 10021.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't