PMID: 8946472Oct 1, 1996Paper

Binding of disopyramide, methadone, dipyridamole, chlorpromazine, lignocaine and progesterone to the two main genetic variants of human alpha 1-acid glycoprotein: evidence for drug-binding differences between the variants and for the presence of two separate drug-binding sites on alpha 1-acid glycoprotein

Pharmacogenetics
F HervéJ P Tillement

Abstract

Human alpha 1-acid glycoprotein (AAG), a plasma drug transport protein, has three main genetic variants, the A variant and the F1 and S variants, which are encoded by two different genes. The binding of disopyramide, methadone, dipyridamole, chlorpromazine, lignocaine and progesterone to the two main gene products of AAG-the A variant and a mixture of the F1 and S variants (60% F1 and 40% S)-separated by chromatography from native commercial AAG, a mixture of almost equal proportions of the F1, S and A variants, was studied by equilibrium dialysis. A selective binding of disopyramide and methadone to the A variant and a preferential binding of dipyridamole to the F1S variant mixture were found. Lignocaine and chlorpromazine had a slight preference for binding to the A variant and to the F1S mixture, respectively, but progesterone showed no selectivity with regard to any of the variants of AAG. The differences in drug-binding demonstrated between the A variant and the F1S mixture confirmed those of a previous study, in which a selective binding of imipramine to the A variant and of warfarin and mifepristone to the F1S mixture have been found. These results indicate specific drug transport roles for each AAG variant, according to...Continue Reading

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