Linked Life Data

10692471

Source:http://linkedlifedata.com/resource/pubmed/id/10692471

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
9
pubmed:dateCreated
2000-4-3
pubmed:abstractText
Oncogenic ras induces the expression of cyclooxygenase-2 (COX-2) in a variety of cells. Here we investigated the role of transforming growth factor-beta (TGF-beta) in the Ras-mediated induction of COX-2 in intestinal epithelial cells (RIE-1). RIE-1 cells were transfected with an inducible Ha-Ras(Val12) cDNA and are referred as RIE-iRas cells. the addition of 5 mM isopropyl-1-thio-beta-D-galactopyranoside (IPTG) induced the expression of Ha-Ras(Val12), closely followed by an increase in the expression of COX-2. Neutralizing anti-TGF-beta antibody partially blocked the Ras-induced increase in COX-2. Combined treatment with IPTG and TGF-beta1 resulted in a 20-50-fold increase in the levels of COX-2 mRNA. The t1/2 of COX-2 mRNA was increased from 13 to 24 min by Ha-Ras induction alone. The addition of TGF-beta1 further stabilized the COX-2 mRNA (t1/2 > 50 min). Stable transfection of a luciferase reporter construct containing the COX-2 3'-untranslated region (3'-UTR) revealed that TGF-beta1 treatment and Ras induction each stabilized the COX-2 3'-UTR. Combined treatment with IPTG and TGF-beta1 synergistically increased the luciferase activity. Furthermore, a conserved AU-rich region located in the proximal COX-2 3'-UTR is required for maximal stabilization of COX-2 3'-UTR by Ras or TGF-beta1 and is necessary for the synergistic stabilization of COX-2 3'-UTR by oncogenic Ras and TGF-beta1.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
3
pubmed:volume
275
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
6628-35
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Transforming growth factor-beta1 enhances Ha-ras-induced expression of cyclooxygenase-2 in intestinal epithelial cells via stabilization of mRNA.
pubmed:affiliation
Department of Surgery, The Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA. hongmiao.sheng@mcmail.vanderbilt.edu
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S.