Linked Life Data

3478335

Source:http://linkedlifedata.com/resource/pubmed/id/3478335

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
30
pubmed:dateCreated
1987-11-23
pubmed:abstractText
Platelet-derived growth factor (PDGF) is composed of homologous polypeptide chains, termed A and B, that are expressed as mitogenically active A-A, B-B, or A-B dimers. Previous work in our laboratory has demonstrated that PDGF B chain mRNA expression is stimulated in microvascular endothelial cells by phorbol esters (PMA), thrombin, and transforming growth factor-beta (TGF-beta) and blocked by agents that elevate cyclic AMP (cAMP). Here we report the first evidence that the expression of A chain mRNA is also regulated in these cells. PDGF A chain mRNA levels were increased 5-25-fold by phorbol esters, thrombin, and TGF-beta. Transcripts of four different sizes were induced. The increase in A chain mRNA stimulated by TGF-beta was more prolonged (peak 4 h, duration 48 h) than the increase stimulated by PMA and thrombin (peak 4 h, duration 8 h). Among the agents known to increase B chain mRNA levels, PMA was most efficacious, followed in decreasing order by thrombin and TGF-beta. However, for A chain mRNA induction by these same agents, the order was reversed; TGF-beta was most efficacious, followed in decreasing order by thrombin and PMA. Agents that elevate cyclic AMP, known to block induction of B chain mRNA, blocked A chain induction by thrombin but had less effect on A chain mRNA induced by TGF-beta. Thus PDGF A chain mRNA levels are regulated by the same agents that regulate B chain mRNA levels in microvascular endothelial cells. While the changes in A chain mRNA are qualitatively similar to the changes in B chain mRNA in microvascular endothelial cells, there are differences in the relative efficacies of these agents in the regulation of PDGF A and B chain genes. These differences suggest that the forms of PDGF produced by endothelial cells depend on the nature of the inducing stimulus.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
262
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
14381-4
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1987
pubmed:articleTitle
Regulated expression of the platelet-derived growth factor A chain gene in microvascular endothelial cells.
pubmed:affiliation
Cardiovascular Research Institute, University of California, San Francisco 94143.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't