alexa Interaction of pristinamycin IA with P-glycoprotein in human intestinal epithelial cells.
Nephrology

Nephrology

Journal of Nephrology & Therapeutics

Author(s): PhungBa V, Warnery A, Scherman D, Wils P

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Abstract Pristinamycin IA is a cyclo-peptidic macrolactone antibiotic belonging to the streptogramin family. In the present work, the interaction of pristinamycin IA with the multidrug transporter P-glycoprotein was investigated in the differentiated human intestinal epithelial cell line Caco-2. Pristinamycin IA specifically inhibited the efflux of the P-glycoprotein substrate [3H]vinblastine, thus increasing the cellular accumulation of the drug. Pristinamycin IA also reduced by 70\% the basolateral to apical secretion of [3H]vinblastine across Caco-2 cell monolayers. The cellular accumulation of [14C]pristinamycin IA was very low and was increased by P-glycoprotein inhibitors (verapamil, chlorpromazine and reserpine). The basolateral to apical transport of [14C]pristinamycin IA was 100-fold higher than apical to basolateral passage. This polarized transport was inhibited by verapamil and by ATP depletion. The results suggest that pristinamycin IA is a substrate for the P-glycoprotein, a finding which may have important consequences for the pharmacokinetics of this drug.
This article was published in Eur J Pharmacol and referenced in Journal of Nephrology & Therapeutics

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