期刊
JOURNAL OF CELLULAR PHYSIOLOGY
卷 217, 期 2, 页码 558-568出版社
WILEY-LISS
DOI: 10.1002/jcp.21532
关键词
-
资金
- NCI NIH HHS [R01 CA064945-13, CA64945, R01 CA064945] Funding Source: Medline
All trans retinoic acid (atRA) has been shown to inhibit the growth of CAOV3 ovarian carcinoma cells and to elevate the level of p27 cyclin-dependent kinase inhibitor. We report here that phosphorylation at S 10 residue is an important event in mediating p27 role in atRA induced growth arrest. atRA treatment of atRA sensitive CAOV3 cells increases the levels of S 10 phospho-p27 in both nuclear and cytoplasmic cell compartments. This increase is accompanied by a decrease in the levels of skp2 protein. This effect was not observed in SKOV3 cells which are resistant to atRA growth inhibitory effect. An A10-p27 mutant that cannot be phosphorylated at S 10 induces a dominant negative effect on the atRA effect on the levels and activity of endogenous p27. Overexpression of A10-p27 mutant renders CAOV3 cells more resistant to atRA treatmentand reverses the effect that atRA has on p27 binding to CDKs, on CDK activity,and on the expression of S phase genes.
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