Linked Life Data

1310797

Source:http://linkedlifedata.com/resource/pubmed/id/1310797

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1992-3-18
pubmed:abstractText
The effects of okadaic acid (OA), a protein phosphatase inhibitor, on transcriptional enhancement activity of rat glucocorticoid receptor (GR) were examined in transiently transfected cells. In the absence of hormone, GRs expressed in CV-1 and COS-1 fibroblasts were capable of enhancing transcription from cotransfected chloramphenicol acetyltransferase reporter plasmids in response to OA treatment. Synergistic enhancement resulted from combined hormone and OA treatment. The effects of OA on GR-mediated enhancement required the presence of linked glucocorticoid response elements and were observed with reporter plasmids that contained different promoters and glucocorticoid response elements. Since OA did not affect nuclear translocation of the receptor, enhancement mediated by unliganded GR was most likely accounted for by the accumulation of some unliganded GRs within nuclei of transfected CV-1 and COS-1 cells. Deletion of individual GR transactivation domains and point mutations within DNA- and hormone-binding domains severely reduced the response of receptors to OA, although some mutant receptors retained the capacity to elicit a synergistic response when exposed to OA and hormone. The effects of OA on transcriptional enhancement did not appear to correlate with major changes in GR phosphorylation, as visualized by two-dimensional tryptic mapping of in vivo 32P-labeled GRs. Thus, phosphorylation of various components of the GR signal transduction pathway, and not necessarily the receptor itself, may influence its transcriptional enhancement activity.
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
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
26-34
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Effects of okadaic acid, a protein phosphatase inhibitor, on glucocorticoid receptor-mediated enhancement.
pubmed:affiliation
Department of Biological Sciences, University of Pittsburgh, Pennsylvania 15260.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S.