Acute Leukemias pp 56-59 | Cite as
Cytostatic Drug Resistance and Differentiation in Friend Erythroleukemia Cells
Abstract
Cytostatic drug resistance is a common clinical problem in antitumor chemotherapy. To study mechanisms of drug resistance, in vitro model systems have been established. Frequently cross-resistance to other cytostatic drugs (i.e., chemically and structurally not related to the selective agent) was observed in these cell lines [1]. Multidrug resistance included medicaments often used in clinical therapy regimens such as vinca alkaloids or anthracyclines. Over-expression of a 170 kD glycoprotein was found to correlate with the multidrugresistant phenotype [2, 3]. The gene encoding for the 170 kD glycoprotein, mdrl, has been cloned and sequenced [4, 5]. The multidrug-resistant phenotype could be transferred to drug-sensitive cells by transfection with mdrl cDNA [6, 7]. Resistant cells showed significant lower intracellular cytostatic drug levels, due to an activated drug efflux mechanism [8, 9]. MDR gene overexpression was detected in several leukemias and tumors and could be related to poor prognosis [10–13].
Keywords
Vinca Alkaloid Cytostatic Drug Multidrug Resis Ling Versus Actin ProbePreview
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