In vitro cellular accumulation and cytotoxicity of liposomal and conventional formulations of daunorubicin and doxorubicin in resistant K562 cells.

Abstract:

:Previous investigations have indicated the possibility to circumvent multidrug resistance (MDR) by incorporation of an anthracycline into liposomes. We examined the in vitro cytotoxicity and cellular drug accumulation of the anthracyclines daunorubicin and doxorubicin compared with the commercially available liposomal formulations DaunoXome and Caelyx in human myelogenous leukemia K562 cells. The drug-sensitive parental K562/K line was compared with the P-glykoprotein (P-gp)-expressing cell lines K562/Dnr and K562/Vcr. Two cell lines with reduced levels of topoisomerase II (K562/Nov and K562/Ida) were also included. The cytotoxicity was determined by fluorometric microculture cytotoxicity assay and the cellular drug levels were determined by high performance liquid chromatograghy. There was a strong inverse correlation between P-gp levels and cellular drug accumulation (rho = -0.83, p = 0.04) and cytotoxicity (rho = -0.95, p = 0.01) of daunorubicin. Also the cytotoxicity of DaunoXome and doxorubicin was related to P-gp levels (rho = -0.96, p = 0.01 and rho = -0.90, p = 0.07, respectively). Caelyx did not show any cytotoxic effect due to impaired cellular uptake of the pegylated liposome. Regardless of the P-gp levels of the treated cells, DaunoXome showed the same cytotoxic effect despite lower intracellular accumulation (range 22-47%), compared with conventional daunorubicin.

journal_name

Anticancer Drugs

journal_title

Anti-cancer drugs

authors

Wang Y,Eksborg S,Lewensohn R,Lindberg A,Liliemark E

doi

10.1097/00001813-199911000-00008

subject

Has Abstract

pub_date

1999-11-01 00:00:00

pages

921-8

issue

10

eissn

0959-4973

issn

1473-5741

journal_volume

10

pub_type

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