Title : Implications of p53 in growth arrest and apoptosis on combined treatment of human Mammary epithelial cells with topotecan and UCN-01.

Pub. Date : 2004 Oct

PMID : 15724841






4 Functional Relationships(s)
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1 We previously reported (Cancer Chemother Pharmacol 45: 252-258, 2000) that UCN-01 (7-hydroxystaurosporine), a protein kinase inhibitor, which is under clinical trials as an anti-cancer agent in the USA and Japan, enhanced camptothecin-induced cytotoxicity in breast cancer cells that lack p53 function. 7-hydroxystaurosporine tumor protein p53 Homo sapiens
2 We previously reported (Cancer Chemother Pharmacol 45: 252-258, 2000) that UCN-01 (7-hydroxystaurosporine), a protein kinase inhibitor, which is under clinical trials as an anti-cancer agent in the USA and Japan, enhanced camptothecin-induced cytotoxicity in breast cancer cells that lack p53 function. 7-hydroxystaurosporine tumor protein p53 Homo sapiens
3 Detailed cell-cycle analyses revealed that UCN-01 abrogated S-phase accumulation induced by topotecan treatment in p53 defective MDA231 tumor cells and HMEC/E6 cells. 7-hydroxystaurosporine tumor protein p53 Homo sapiens
4 These data indicate that UCN-01 selectively enhances topotecan cytotoxicity in p53 defective cells through the induction of apoptotic signaling pathway(s), although the time course for the induction of cell death is not the same. 7-hydroxystaurosporine tumor protein p53 Homo sapiens