Evidence that low doses of Taxol enhance the functional transactivatory properties of p53 on p21 waf promoter in MCF-7 breast cancer cells

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• 作者：M. Luisa Panno ; Francesca Giordano ; Fabrizia Mastroianni ; Catia Morelli ; Elvira Brunelli ; M. Grazia Palma ; Michele Pellegrino ; Saveria Aquila ; Antonella Miglietta ; Loredana Mauro et al.
• 关键词：Taxol ; p21 waf ; p53 ; Breast cancer cells
• 刊名：FEBS Letters
• 出版年：2006
• 出版时间：17 April 2006
• 年：2006
• 卷：580
• 期：9
• 页码：2371-2380
• 全文大小：691 K

文摘

In the present study, we evidence how in breast cancer cells low doses of Taxol for 18 h determined the upregulation of p53 and p21 waf expression concomitantly with a decrease of the anti-apoptotic Bcl-2. P53 and its gene product, the mdm2 protein, in treated cells exhibits a prevalent nuclear compartmentalization, thus potentiating p53 transactivatory properties. Indeed, the most important finding of this study consists with the evidence that Taxol at lower concentrations is able to produce the activation of p21 promoter via p53. Prolonged exposure of MCF-7 cells to Taxol (48 h) resulted in an increased co-association between p21 and PCNA compared to control and this well fits with the simultaneous block of cell cycle into the G2/M phase.