Abstract:
:Transforming growth factor-beta 1 (TGF-beta 1) inhibits most epithelial cell types by blocking cell cycle progression during the G1 phase. D cyclins are normally expressed during G1 and are regulators of G1 progression. One of the crucial functions of D cyclins is their ability to bind to a cyclin-dependent kinase (Cdk4). In mink lung epithelial cells, TGF-beta 1 inhibits Cdk4 expression. We have measured cell cycle progression and D cyclins and Cdk4 expression in non-transformed rat intestinal epithelial cell lines (IEC-6 and RIE-1) after TGF-beta 1 treatment. In exponentially growing cultures, TGF-beta 1 blocked DNA synthesis and suppressed cyclin D1 mRNA and protein expression, whereas the levels of cyclins D2, D3 and Cdk4 remained relatively unchanged. TGF-beta 1 was also added to G0-synchronized IEC-6 cells after serum stimulation. TGF-beta 1 prevention of G1 progression was associated with an inhibition of cyclin D1 protein expression. Cyclin D3 levels were not affected by TGF-beta 1 during G1 traverse. Our results suggest that cyclin D/Cdk4 is a crucial target of TGF-beta 1 and that regulation of this kinase is mediated through cyclin D1 in intestinal epithelial cells.
journal_name
Oncogenejournal_title
Oncogeneauthors
Ko TC,Sheng HM,Reisman D,Thompson EA,Beauchamp RDsubject
Has Abstractpub_date
1995-01-05 00:00:00pages
177-84issue
1eissn
0950-9232issn
1476-5594journal_volume
10pub_type
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