Human accumulation potential of xenobiotics: potential of catamphiphilic drugs to promote their accumulation via inducing lipidosis or mucopolysaccharidosis

Xenobiotica; the Fate of Foreign Compounds in Biological Systems
L HeinK Mohr

Abstract

1. Drug accumulation without a concomitant elevation of blood level may occur if the capacity of the tissue to bind drug increases during chronic treatment. 2. This special type of accumulation is found with cationic-amphiphilic drugs, which induce the formation of lysosomal inclusion bodies containing undergraded lipids or mucopolysaccharides (drug-induced lipidosis or mucopolysaccharidosis, respectively); the stored material provides the additional binding sites for the drug. 3. Factors determining the potential for inducing lipidosis or mucopolysaccharidosis are: (a) affinity of the drugs to phospholipid layers (governed by hydrophobicity) or mucopolysaccharides (drug-induced lipidosis or mucopolysaccharidosis, respectively); the free intra-lysosomal concentration, which is elevated compared with the blood level due to lysosomal trapping (especially with dicationic drugs); (c) the therapeutically required drug concentration in the blood: the therapeutic concentrations are high with drugs that do not act via binding to specific high-affinity receptors.

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Jun 29, 2002·Aquatic Toxicology·Michael N Moore
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