PMID: 8953513Oct 1, 1996Paper

Active secretion of drugs from the small intestinal epithelium in rats by P-glycoprotein functioning as an absorption barrier

The Journal of Pharmacy and Pharmacology
T TeraoA Tsuji

Abstract

Because the significance of P-glycoprotein in the in-vivo secretion of beta-blockers in intestinal epithelial cells is unclear, the secretory mechanism for beta-blockers and other drugs has been evaluated. Uptake of the beta-blockers acebutolol, celiprolol, nadolol and timolol, and the antiarrhythmic agent, quinidine by the multidrug-resistant leukaemic cell line variant K562/ADM was significantly lower than that by drug-sensitive K562 cells, suggesting that these beta-blockers are transported by P-glycoprotein out of cells. The reduced uptake of acebutolol by the drug-resistant K562/ADM cells was reversed by treating the cells with anti-P-glycoprotein monoclonal antibody, MRK16, whereas no such alteration in uptake was observed for drug-sensitive K562 cells. Acebutolol uptake by K562/ADM cells was, moreover, markedly enhanced, in a concentration-dependent manner, in the presence of the specific P-glycoprotein inhibitors, MS-209 and cyclosporin. Caco-2 cells were used for evaluation of the role of P-glycoprotein in intestinal permeability to drugs in-vitro. Basolateral-to-apical transport of acebutolol was twice that in the reverse direction. A similar polarized flux was also observed in the transport of vinblastine, but not in...Continue Reading

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