title: DNA damage and repair in BCR/ABL-expressing cells after combined action of idarubicin, STI571 and amifostine.
abstract: STI571 is a specific ABL family tyrosine kinases inhibitor approved for treatment of leukemias. It can differentially modulate the action of other antileukemic drugs. We have recently shown that deregulation of the mechanisms of DNA damage and repair in BCR/ABL-positive cells may be involved in drug resistance of these cells, and thus determine the response of cancer cells to therapy. In the present work we investigated DNA damage and repair induced by idarubicin in the presence of STI571 and amifostine, a normal cell protector, in the BCR/ABL fusion tyrosine kinase-expressing cell line. Amifostine increased the viability of both kinds of cells in the absence of STI571, but had no effect in the presence of the inhibitor. STI571 did not change the response of both BCR/ABL-expressing cells and their control counterparts to idarubicin in terms of DNA damage and repair. However, the presence of amifostine modulated the response of the cells. In the absence of STI571 amifostine decreased the DNA-damaging effect of idarubicin in normal cells and increased it in BCR/ABL-positive cells. STI571 at 2 M abolished the protective effect of amifostine against idarubicin in normal cells and diminished the magnitude of the amifostine-induce increase in cancer cells. These results suggest that amifostine should be applied with special caution in idarubicin-based chemotherapies of BCR/ABL-positive leukemias involving STI571 inhibitor.
authors.affiliation: Department of Molecular Genetics University of Lodz, 90-237 Lodz, Poland. jblasiak@biol.uni.lodz.pl
authors.forename: Janusz
authors.initials: J
authors.lastname: Blasiak
authors.forename: Ewa
authors.initials: E
authors.lastname: Gloc
authors.forename: Tomasz
authors.initials: T
authors.lastname: Pertyński
authors.forename: Józef
authors.initials: J
authors.lastname: Drzewoski
mesh_terms: D004999:Amifostine / Q000494:pharmacology; D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D001549:Benzamides; D002461:Cell Line, Transformed; D002470:Cell Survival / Q000187:drug effects; D020552:Comet Assay; D004249:DNA Damage; D004260:DNA Repair; D004338:Drug Combinations; D016044:Fusion Proteins, bcr-abl / Q000096:biosynthesis*; D015255:Idarubicin / Q000494:pharmacology; D000068877:Imatinib Mesylate; D010879:Piperazines / Q000494:pharmacology; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D011743:Pyrimidines / Q000494:pharmacology; D051381:Rats
chemical_list: D000970:Antineoplastic Agents; D001549:Benzamides; D004338:Drug Combinations; D010879:Piperazines; D011743:Pyrimidines; D000068877:Imatinib Mesylate; D011505:Protein-Tyrosine Kinases; D016044:Fusion Proteins, bcr-abl; D004999:Amifostine; D015255:Idarubicin