Abstract:
:TGF-beta1 stimulates proliferation of WI38 human embryo fibroblasts but inhibits that of their SV40-transformed counterparts, VA13 cells. Protein expression levels of cyclins A, D1, E and that of cdk2 and cdk4 were not affected by TGF-beta1 in either of these cells. However, TGF-beta1-treatment increases cdk2 kinase activity in WI38 cells and reduces it in VA13 cells. The same treatment reduces the amount of p21waf present in complexes with cyclins D1 and E in growth-stimulated WI38 cells, but the reverse applies in growth-inhibited VA13 cells. Mitogenic stimulation of WI38 fibroblasts correlated with decreased expression of p27kip protein and reduced amounts of it in complex with cyclin E. In contrast, proliferative inhibition of VA13 fibroblasts by TGF-beta1 caused a reduction of p27kip in complexes with cyclin D1, but increased it in complexes with cyclin E, without affecting the overall level of p27kip protein expression. Thus, in this human fibroblast model, TGF-beta1-mediated stimulation or inhibition of proliferation depends on modulation in the amounts of p21waf and p27kip in complexes with cyclins D1 and E.
journal_name
Int J Oncoljournal_title
International journal of oncologyauthors
Dkhissi F,Raynal S,Lawrence DAdoi
10.3892/ijo.14.5.905keywords:
subject
Has Abstractpub_date
1999-05-01 00:00:00pages
905-10issue
5eissn
1019-6439issn
1791-2423journal_volume
14pub_type
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