title: Daunorubicin uptake by leukemic cells: correlations with treatment outcome and mdr1 expression.
abstract: The in vitro daunorubicin (DNR) cell uptake was investigated by flow cytometry in K562/DOX resistant cell line and in 42 patients with acute myeloid leukemia (AML). The proportion of cells able to take up DNR was higher in untreated patients (50% +/- 30) than in previously treated patients (31% +/- 31) (p = 0.04). We noted a good correlation (p < 0.001) between the drug uptake after exposure to 0.1 microM DNR and achievement of complete remission. Cyclosporin A (CsA, 1 microgram/ml) and verapamil (5 micrograms/ml), but not cefoperazone (10 mM), completely reversed (CsA) or partially reversed (verapamil) the DNR efflux from K562/DOX mdr1(+) cell line. CsA significantly increased (p < 0.01) the DNR uptake of fresh leukemic cells, but not consistently, with no relationship to mdr1 mRNA cellular level. This absence of correlation was explained by the fact that several patients with no mdr1 gene expression exhibited a low in vitro DNR uptake, showing that the MDR phenotype is not the only mechanism responsible for the alteration of DNR pharmacokinetics in AML.
authors.affiliation: Laboratoire de Cinétique et de Cultures Cellulaires, Formation Associée Claude Bernard, Hôtel-Dieu, Paris, France.
authors.forename: J P
authors.initials: JP
authors.lastname: Marie
authors.forename: A M
authors.initials: AM
authors.lastname: Faussat-Suberville
authors.forename: D
authors.initials: D
authors.lastname: Zhou
authors.forename: R
authors.initials: R
authors.lastname: Zittoun
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000208:Acute Disease; D001692:Biological Transport / Q000187:drug effects; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D016572:Cyclosporine / Q000494:pharmacology; D003630:Daunorubicin / Q000378:metabolism*; D004351:Drug Resistance; D015870:Gene Expression; D006801:Humans; D066298:In Vitro Techniques; D007951:Leukemia, Myeloid / Q000378:metabolism*; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics; D012334:RNA, Neoplasm / Q000235:genetics; D014407:Tumor Cells, Cultured
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D002352:Carrier Proteins; D008562:Membrane Glycoproteins; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D016572:Cyclosporine; D003630:Daunorubicin