PMID: 8944778Nov 1, 1996Paper

The overall partitioning of anthracyclines into phosphatidyl-containing model membranes depends neither on the drug charge nor the presence of anionic phospholipids

European Journal of Biochemistry
L GalloisA Garnier-Suillerot

Abstract

Anthracyclines are potent anticancer agents. Their use is limited by the problem of multidrug resistance (MDR) associated with a decreased intracellular accumulation of drug correlated with the presence, in the membrane of resistant cells, of the P-glycoprotein responsible for an active efflux of the drug. The activity of a drug depends upon its intracellular concentration which itself depends on the kinetics (a) of passive influx (b) of passive efflux and (c) of the P-glycoprotein-mediated efflux of drug across the cell membrane. The ability of an anthracycline to overcome MDR depends largely on the first point. The passive drug uptake is governed by their incorporation into the lipid matrix and both electrostatic and hydrophobic forces seem necessary for the stabilization of anthracyclines into lipid bilayers. The aim of the present study was to determine the relative importance of these two interactions. Using microspectrofluorometry and the observation that the fluorescence of anthracycline is enhanced when the dihydroanthraquinone part is embedded within the lipid bilayer, we have determined the partition coefficient (alternatively, the binding constant) of 12 anthracycline derivatives in large unilamellar vesicles. The an...Continue Reading

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