Linked Life Data

10544951

Source:http://linkedlifedata.com/resource/pubmed/id/10544951

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
1999-11-30
pubmed:abstractText
T47D cells, cultured in medium containing serum stripped of endogenous steroids, proliferate in response to treatment with the progesterone receptor (PR) agonist, R5020 or the PR agonist/antagonist, RU486, whereas the full PR antagonist, ZK98299 has no proliferative effects. Under estrogenized conditions, all of the PR ligands tested inhibit cell growth [23]. In order to determine whether the levels or phosphorylation state of PR are reflected in the growth patterns of T47D cells, we monitored the effects of these PR ligands on the immunoblotted PR band intensities, the relative intensities of PR-A and PR-B, and their phosphorylation states that are reflected in their altered mobility during SDS-PAGE. Under conditions where the PR ligands inhibit cell proliferation, each ligand had distinctively different qualitative and quantitative effects on PR. Short term treatment of the cells with R5020 or RU486 induced a characteristic phosphorylation-dependent upshift of both PR-A and PR-B. The phosphorylated PR was stable for up to 4 days after treatment of the cells with RU486, but was down regulated between 6-24 h after treatment with R5020. No replenishment of PR in cells treated with R5020 was detected. ZK98299, at concentrations tested, had no qualitative or quantitative effects on PR. Culturing cells for 8 days in medium containing steroid-depleted serum caused a significant reduction in the PR band intensity without causing a change in the ratio of PR-A and PR-B or their phosphorylation states. This decrease in the PR band intensity was reversed by maintaining the cells in 1 nM estrogen, but was potentiated by RU486 or ZK98299. These observations support the view that decreased PR levels may play a role in the stimulatory effects of R5020 and RU486 when cells are cultured under non-estrogenized conditions.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Charcoal, http://linkedlifedata.com/resource/pubmed/chemical/Culture Media, http://linkedlifedata.com/resource/pubmed/chemical/Estradiol, http://linkedlifedata.com/resource/pubmed/chemical/Gonanes, http://linkedlifedata.com/resource/pubmed/chemical/Hormone Antagonists, http://linkedlifedata.com/resource/pubmed/chemical/Mifepristone, http://linkedlifedata.com/resource/pubmed/chemical/Progesterone Congeners, http://linkedlifedata.com/resource/pubmed/chemical/Promegestone, http://linkedlifedata.com/resource/pubmed/chemical/Receptors, Progesterone, http://linkedlifedata.com/resource/pubmed/chemical/onapristone, http://linkedlifedata.com/resource/pubmed/chemical/progesterone receptor A, http://linkedlifedata.com/resource/pubmed/chemical/progesterone receptor B
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0300-8177
pubmed:author
pubmed:issnType
Print
pubmed:volume
199
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
49-56
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1999
pubmed:articleTitle
Agonist and antagonist-induced qualitative and quantitative alterations of progesterone receptor from breast cancer cells.
pubmed:affiliation
Department of Biological Sciences and the Center for Biomedical Research, Oakland University, Rochester, MI 48309-4401, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't