Linked Life Data

16490301

Source:http://linkedlifedata.com/resource/pubmed/id/16490301

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2006-3-17
pubmed:abstractText
17Beta-hydroxysteroid dehydrogenases (17beta-HSDs) are a family of enzymes that regulate steroid availability within a tissue by catalysing the interconversion of active and inactive forms. Type 1 is up-regulated in many breast tumours, and is responsible for the reduction of oestrone to active oestradiol which stimulates cell proliferation within the tumour. Type 2 oxidises many active steroids to their inactive forms, including oestradiol to oestrone. In this study, we have compared the mRNA expression and enzyme activities of Type 1 and Type 2 in MCF-7, MDA-MB-231, T47D, JEG3 and 293-EBNA cell lines. Also studied were two cell lines stably expressing transfected Type 1 cDNA. RT-PCR indicated that little Type 1 mRNA is expressed in two of the breast cancer cell lines, MCF-7 and MDA-MB-231, and in 293-EBNA cells, but that expression is much higher in the T47D breast cancer cell line, and in the choriocarcinoma cell line, JEG3. However, a higher level of expression of Type 1 is seen in the transfected cell lines MCF-7.8H and 293-EBNA[His617beta-HSD1]. Activity assays show that there is high association between mRNA expression and enzyme activity. Assays indicate that, with the exception of MDA-MB-231 cells, Type 2 activity is low in these lines. The study of the basal activities of these enzymes will be used in future studies investigating the regulation of the enzymes by endogenous and exogenous factors. An understanding of their regulation in both healthy and malignant tissues may lead to future therapeutic intervention at the regulatory level.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0303-7207
pubmed:author
pubmed:issnType
Print
pubmed:day
27
pubmed:volume
248
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
246-9
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
17Beta-hydroxysteroid dehydrogenase Type 1 and Type 2: association between mRNA expression and activity in cell lines.
pubmed:affiliation
Endocrinology and Metabolic Medicine and Sterix Ltd., Imperial College, St. Mary's Hospital, London W2 1NY, UK. joanna.day@imperial.ac.uk
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't