Abstract：
:BRCA1 is a tumour suppressor gene implicated in the predisposition to early onset breast and ovarian cancer. We have generated cell lines with inducible expression of BRCA1 to evaluate its role in mediating the cellular response to various chemotherapeutic drugs commonly used in the treatment of breast and ovarian cancer. Induction of BRCA1 in the presence of Taxol and Vincristine resulted in a dramatic increase in cell death; an effect that was preceded by an acute arrest at the G2/M phase of the cell cycle and which correlated with BRCA1 mediated induction of GADD45. A proportion of the arrested cells were blocked in mitosis suggesting activation of both a G2 and a mitotic spindle checkpoint. In contrast, no specific interaction was observed between BRCA1 induction and treatment of cells with a range of DNA damaging agents including Cisplatin and Adriamycin. Inducible expression of GADD45 in the presence of Taxol induced both G2 and mitotic arrest in these cells consistent with a role for GADD45 in contributing to these effects. Our results support a role for both BRCA1 and GADD45 in selectively regulating a G2/M checkpoint in response to antimicrotubule agents and raise the possibility that their expression levels in cells may contribute to the toxicity observed with these compounds.
journal_name
Oncogenejournal_title
Oncogeneauthors
Mullan PB,Quinn JE,Gilmore PM,McWilliams S,Andrews H,Gervin C,McCabe N,McKenna S,White P,Song YH,Maheswaran S,Liu E,Haber DA,Johnston PG,Harkin DPdoi
10.1038/sj.onc.1204712subject
Has Abstractpub_date
2001-09-27 00:00:00pages
6123-31issue
43eissn
0950-9232issn
1476-5594journal_volume
20pub_type
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