title: Daunorubicin-resistant Chinese hamster ovary cells expressing multidrug resistance and a cell-surface P-glycoprotein.
abstract: Independent lines of Chinese hamster ovary cells resistant to the antineoplastic drug, daunorubicin, were obtained by clonal isolation in increasing drug concentrations. A single daunorubicin-resistant phenotype typified by reduced cellular drug accumulation was observed. These mutants displayed a complex phenotype of resistance to a variety of unrelated drugs. Such properties are similar to those of membrane-altered colchicine-resistant lines (V. Ling and L.H. Thompson, J. Cell. Physiol., 83: 103-116, 1974). Analysis of the plasma membrane components of the daunorubicin-resistant clones by gel electrophoresis revealed a prominent cell surface glycoprotein with a molecular weight of about 170,000. This component was immunologically cross-reactive with the cell surface P-glycoprotein of about the same molecular weight, previously identified in colchicine-resistant cells. Thus, it appears that the mechanism of resistance characterized by P-glycoprotein expression could be the basis of many drug-resistant phenotypes.
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects*; D006224:Cricetinae; D003412:Cricetulus; D003630:Daunorubicin / Q000031:analogs & derivatives / Q000494:pharmacology*; D004317:Doxorubicin / Q000494:pharmacology; D004351:Drug Resistance; D005260:Female; D006023:Glycoproteins / Q000235:genetics* / Q000302:isolation & purification; D006822:Hybrid Cells / Q000187:drug effects; D007700:Kinetics; D009154:Mutation; D010053:Ovary; D011691:Puromycin / Q000494:pharmacology; D014747:Vinblastine / Q000494:pharmacology
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000903:Antibiotics, Antineoplastic; D006023:Glycoproteins; D011691:Puromycin; D014747:Vinblastine; D004317:Doxorubicin; C002205:zorubicin; D003630:Daunorubicin