CYP1B1 expression is induced by docetaxel: effect on cell viability and drug resistance.

CYP1B1 expression is induced by docetaxel: effect on cell viability and drug resistance. Research Abstract Details 

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CYP1B1 expression is induced by docetaxel: effect on cell viability and drug resistance. Abstract Text:

V G Martinez,R O'Connor,Y Liang,M Clynes,V G Martinez,R O'Connor,Y Liang,M Clynes,

The cytochrome P450 CYP1B1 is consistently overexpressed in tumour cells as compared to their normal counterparts, but its precise role in drug resistance is yet to be defined. It has been reported that transfection of CYP1B1 results in increased resistance to docetaxel in V79 cells (McFadyen et al, 2001). In this study, we analysed changes in expression of CYP1B1 mRNA associated with pulse selection of MCF-7 cells with docetaxel. Docetaxel-selected MCF-7 cells (MCF-7 Txt), which showed increased resistance to this drug as compared to parental MCF-7 cells, showed a noteworthy increase in CYP1B1 mRNA expression, paralleled by increased ethoxyresorufin-O-deethylase (EROD) activity levels. This effect was not observed in cisplatin- or adriamycin-selected MCF-7 cells, or in docetaxel-selected colon, lung or pancreatic carcinoma cells. Short-term treatment with docetaxel induced CYP1B1 mRNA expression in MDA 453 and BT-20 breast carcinoma cells, but not in MCF-7 cells. Transfection of MCF-7 Txt cells with CYP1B1 siRNA did not significantly affect docetaxel-induced toxicity, but it decreased cell survival in the absence of drug. Preincubation of docetaxel with recombinant CYP1B1 did not affect drug toxicity in A549 cells. These results suggest that CYP1B1 does not directly inactivate docetaxel, but rather might promote cell survival in MCF-7 Txt cells, providing an explanation for its association with drug resistance.British Journal of Cancer (2008) 98, 564-570. doi:10.1038/sj.bjc.6604195 www.bjcancer.com Published online 22 January 2008.

CYP1B1 expression is induced by docetaxel: effect on cell viability and drug resistance. Publishing Authors By Initials

VG Martinez,R O'Connor,Y Liang,M Clynes,VG Martinez,R O'Connor,Y Liang,M Clynes,

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CYP1B1 expression is induced by docetaxel: effect on cell viability and drug resistance. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: British journal of cancer

VOLUME: 98

Page Numbers: 564-70

Journal Abbreviation: Br. J. Cancer

ISSN: 0007-0920

DAY: 22

MONTH: 01

YEAR: 2008

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LANGUAGE: eng

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AFFILIATION: 1National Institute for Cellular Biotechnology (NICB), Dublin City University, Glasnevin, Dublin 9, Ireland.

Country: England

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MEDLINETA: Br J Cancer

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