Linked Life Data

9028736

Source:http://linkedlifedata.com/resource/pubmed/id/9028736

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1997-4-15
pubmed:abstractText
Retinoids modulate gene activity, cell growth and differentiation by binding to a series of nuclear receptors, i.e., retinoic acid receptors (RARs) or retinoid X receptors. Retinoic acid (RA) inhibition of estrogen receptor (ER)-positive breast carcinoma seems to be mediated through RAR alpha. Estrogens upregulate RAR alpha in ER-positive breast carcinoma cell lines. In this study we examined RAR alpha expression in the ER-positive MCF7 and ER-negative MDA-MB-231 human breast carcinoma cell lines as well as in 10 ER-negative and 9 ER-positive infiltrating ductal breast carcinoma specimens using immunohistochemistry and quantitation by image cytometry. MCF7 cells expressed twofold higher levels of RAR alpha protein than MDA-MB-231 cells. RAR alpha expression, as detected by immunostaining and quantitated by image cytometry, was upregulated in these cells by estradiol. ER-positive breast carcinoma specimens also exhibited approximately two-fold higher RAR alpha levels than their ER-negative counterparts. Thus, RAR alpha expression is significantly elevated in ER-positive breast tumors as assessed by detection and quantitation using immunohistochemical staining and image cytometry, respectively. Whether the decrease in RAR alpha protein levels and loss of RA-mediated growth inhibition in ER-negative tumor plays a role in the increased metastatic potential of ER-negative tumors remains to be determined.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1052-9551
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
42-8
pubmed:dateRevised
2004-11-17
pubmed:meshHeading
pubmed:year
1997
pubmed:articleTitle
Elevated expression of retinoic acid receptor-alpha (RAR alpha) in estrogen-receptor-positive breast carcinomas as detected by immunohistochemistry.
pubmed:affiliation
Department of Medicine, University of Maryland Cancer Center, Baltimore, USA.
pubmed:publicationType
Journal Article