Linked Life Data

11920608

Source:http://linkedlifedata.com/resource/pubmed/id/11920608

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pubmed-article:11920608pubmed:abstractTextDefects in apoptosis have been implicated in chemoresistance of colon cancer cells. We report here the ability to resist to 5-fluorouracil-induced apoptosis of 8 colon cancer cell lines differing in p53 and bax status: p53(-/0)bax(+/+) for TC7, SW480, HT-29; p53(+/+)bax(-/-) for LS174T, LoVo; p53(+/+) bax(+/-) for HCT116; p53(+/+) or p53(+/0)bax(+/+) for LS513 or HCT-EB, respectively. To approximate to the in vivo therapy, the cell lines were exposed to a long-term treatment of 5-FU. The analysis of proteins implicated in the apoptotic pathway has shown that the independent analysis of p53 or bax status was not sufficient to predict the extent of drug-resistance of all cell lines. In p53(+/+) cell lines but not in p53(-/0) cell lines, a low level of the pro-apoptotic Bax protein was correlated with a greater resistance of cells to 5-FU. In addition, we found that high levels of anti-apoptotic Bcl-2 and Bcl-x(L) proteins combined with a low level of Bax were correlated to high 5-FU resistance of wild-type p53 cell lines. The same correlation was obtained for 2 out of 3 mutated p53 cell lines. In conclusion, the relative levels of Bcl-2, Bcl-x(L) and Bax may altogether contribute to determine the resistance of a majority of colon tumor cells to long-term 5-FU treatment, whatever their p53 status.lld:pubmed
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pubmed-article:11920608pubmed:copyrightInfoCopyright 2002 Wiley-Liss, Inc.lld:pubmed
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pubmed-article:11920608pubmed:articleTitleResistance of colon cancer cells to long-term 5-fluorouracil exposure is correlated to the relative level of Bcl-2 and Bcl-X(L) in addition to Bax and p53 status.lld:pubmed
pubmed-article:11920608pubmed:affiliationINSERM U505, Université Pierre et Marie Curie, Paris, France.lld:pubmed
pubmed-article:11920608pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11920608pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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