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Paclitaxel selects for mutant or pseudo-null p53 in drug resistance associated with tubulin mutations in human cancer.

Abstract：

:The efficacy of anticancer therapy is limited by the development of drug resistance. While the role of p53 in the intrinsic sensitivity of human cancer cells to paclitaxel (PTX) remains controversial, its role in acquired paclitaxel resistance has never been addressed. In this study we examined the p53 status of three paclitaxel selected human ovarian carcinoma sublines, resistant to paclitaxel due to acquired beta-tubulin mutations which impair paclitaxel's interaction with tubulin. In contrast to parental cells which have wt p53, in all PTX-resistant sublines p53 was functionally inactive. Two of the resistant sublines expressed high levels of transcriptionally inactive p53 protein, each with a distinct point mutation in codons 236 and 239 of the DNA binding domain. The third subline presented a novel p53 pseudo-null phenotype as a result of markedly decreased wt p53 mRNA expression. Introduction of ectopic wt p53 had no effect on PTX sensitivity in both parental and resistant cells, while it induced p21WAF1/CIP1, demonstrating an intact p53 pathway. While PTX resistance is primarily conferred by the tubulin mutations, the loss of functional p53 observed in all clones, suggests that this loss may facilitate the development of resistance potentially by providing a clonal advantage which promotes the isolation of paclitaxel resistant cells.

journal_name

Oncogene

journal_title

Oncogene

authors

Giannakakou P,Poy G,Zhan Z,Knutsen T,Blagosklonny MV,Fojo T

doi

10.1038/sj.onc.1203642

subject

Has Abstract

pub_date

2000-06-22 00:00:00

pages

3078-85

issue

27

eissn

0950-9232

issn

1476-5594

journal_volume

19

pub_type

杂志文章

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