title: Increased resistance to anticancer therapy of mouse cells lacking the poly(ADP-ribose) polymerase attributable to up-regulation of the multidrug resistance gene product P-glycoprotein.
abstract: Mouse embryo fibroblasts lacking poly(ADP-ribose) polymerase (PARP)-1 express a barely detectable level of wild-type (wt) p53 protein. Doxorubicin at concentrations activating wt p53 in normal mouse embryo fibroblasts failed to induce it in mutant cells. wt p53 was only activated in response to a 10-fold higher doxorubicin dose. Treatment with higher doxorubicin concentrations was cytotoxic for normal but not for PARP-1 -/- cells. The latter was also resistant to other anticancer agents. The increased resistance of mutant cells to drugs resembled a unique phenomenon known as multidrug resistance (MDR). Interestingly, the MDR gene product P-glycoprotein was clearly up-regulated in PARP-1-deficient cells as compared with normal counterparts. Pretreatment with verapamil reversed the MDR phenotype.
authors.affiliation: Institute of Cancer Research, University of Vienna, Austria.
authors.forename: G
authors.initials: G
authors.lastname: Wurzer
authors.forename: Z
authors.initials: Z
authors.lastname: Herceg
authors.forename: J
authors.initials: J
authors.lastname: Wesierska-Gadek
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D000970:Antineoplastic Agents / Q000493:pharmacokinetics / Q000494:pharmacology; D001943:Breast Neoplasms / Q000188:drug therapy / Q000201:enzymology / Q000378:metabolism; D002999:Clone Cells; D004305:Dose-Response Relationship, Drug; D004317:Doxorubicin / Q000493:pharmacokinetics / Q000494:pharmacology; D018432:Drug Resistance, Multiple / Q000235:genetics / Q000502:physiology*; D019008:Drug Resistance, Neoplasm / Q000235:genetics / Q000502:physiology; D004622:Embryo, Mammalian; D005347:Fibroblasts / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D051379:Mice; D018345:Mice, Knockout; D011065:Poly(ADP-ribose) Polymerases / Q000172:deficiency* / Q000235:genetics / Q000378:metabolism; D011339:Probenecid / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis / Q000235:genetics; D015854:Up-Regulation; D014700:Verapamil / Q000494:pharmacology
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D016159:Tumor Suppressor Protein p53; D004317:Doxorubicin; D014700:Verapamil; D011065:Poly(ADP-ribose) Polymerases; D011339:Probenecid