Different effects of metabolic inhibitors and cyclosporin A on daunorubicin transport in leukemia cells from patients with AML
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- 作者：Knaust ; Eva ; Porwit-MacDonald ; Anna ; Gruber ; Astrid ; Xu ; Dawei ; Peterson ; Curt
- 关键词：AML ; acute myeloid leukemia ; AUC ; area under the drug concentration versus time curve ; CyA ; cyclosporin A ; Dnr ; daunorubicin ; MDR ; multidrug resistance ; MFI ; mean fluorescence intensity ; MI ; metabolic inhibitors ; Mrp ; multidrug resistance associated prote
- 刊名：Leukemia Research
- 出版年：2003
- 出版时间：February, 2003
- 年：2003
- 卷：27
- 期：2
- 页码：183-191
- 全文大小：138 K
文摘
The objective of this study was to determine the role of transport proteins in daunorubicin (Dnr) accumulation and efflux in leukemia cells from 36 patients with acute myeloid leukemia (AML). Mononuclear cells were isolated and incubated with 1μM Dnr with/without addition of 3μM cyclosporin A (CyA) or metabolic inhibitors (MI). Cellular Dnr concentration in leukemia blast cells was measured with flow cytometry. After washing and reincubation of the cells in drug-free medium, Dnr efflux was followed with/without addition of CyA or MI. Levels of mRNA expression for mdr1, multidrug resistance associated protein (mrp) and lung resistance protein (lrp) were determined with reverse transcriptase-polymerase chain reaction (RT-PCR). MI enhanced cellular Dnr accumulation to a higher extent than CyA whereas CyA reduced Dnr efflux more efficiently than MI (P<0.001). There was a significant difference in Dnr accumulation between samples with low and high mdr1 mRNA levels but only in the presence of MI or CyA. Our results imply that other factors than P-glycoprotein (Pgp) are of major importance for in vitro Dnr accumulation in AML blasts and that the role of Pgp as a drug efflux pump is not conclusive.