Abstract：
:Mutations in p53 change the sensitivity to cancer chemotherapeutic drugs. Whereas many drugs, including the vinca alkaloids, often become less effective when p53 is transcriptionally inactivated, several, most notably paclitaxel, may become more effective. In studying the underlying mechanism(s), we found that increased MAP4 expression, which occurs with transcriptionally silent p53, is associated with increased sensitivity to paclitaxel and decreased sensitivity to vinca alkaloids. Using murine fibroblasts transfected with MAP4, we directly demonstrated that the changes in drug sensitivity were associated with parallel alterations in drug-induced apoptosis and cell-cycle arrest. Immunofluorescent staining of the microtubule network revealed that cells with increased MAP4 expression displayed an increase in polymerized microtubules and an increased binding of fluorsceinated paclitaxel. Since MAP4 stabilizes polymerized microtubules, overexpression of this gene provides a plausible mechanism to explain the altered sensitivity to microtubule-active drugs in the presence of mutant p53.
journal_name
Oncogenejournal_title
Oncogeneauthors
Zhang CC,Yang JM,White E,Murphy M,Levine A,Hait WNdoi
10.1038/sj.onc.1201658subject
Has Abstractpub_date
1998-03-26 00:00:00pages
1617-24issue
12eissn
0950-9232issn
1476-5594journal_volume
16pub_type
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