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. 1996 Aug;118(7):1841–1847. doi: 10.1111/j.1476-5381.1996.tb15612.x

Relevance of p-glycoprotein for the enteral absorption of cyclosporin A: in vitro-in vivo correlation.

G Fricker 1, J Drewe 1, J Huwyler 1, H Gutmann 1, C Beglinger 1
PMCID: PMC1909843  PMID: 8842452

Abstract

1. The interaction of cyclosporin A (CyA) with p-glycoprotein during intestinal uptake was investigated by a combination of in vitro experiments with human Caco-2 cells and an intubation study in healthy volunteers. 2. CyA uptake into the cells was not saturable and exhibited only a low temperature sensitivity, suggesting passive diffusion. When the permeation of CyA across Caco-2 monolayers from the apical to the basolateral side was determined, overall transport had an apparently saturable component up to a concentration of 1 microM. At higher concentrations permeation increased over-proportionally. Calculation of the kinetic parameters of apical to basolateral permeation suggested a diffusional process with a KD of 0.5 microliter min-1 per filter, which was overlayed by an active system in basolateral to apical direction with a KM of 3.8 microM and a Jmax of 6.5 picomol min-1 per filter. 3. CyA permeation was significantly higher when the drug was given from the basolateral side as compared to the permeation from the apical side. Apical to basolateral transport of CyA was increased in the presence of vinblastine, daunomycin and a non-immunosuppressive CyA-derivative. All compounds inhibit p-glycoprotein-mediated transport processes. Basolateral to apical permeation of CyA showed a dose-dependent decrease in the presence of vinblastine. Permeation of daunomycin across Caco-2 cell monolayers was also higher from the basolateral to the apical side than vice versa. Basolateral to apical permeation was decreased in the presence of SDZ PSC 833 and cyclosporin A. 4. Western blot analysis of Caco-2 cells with the monoclonal antibody C219 confirmed the presence of p-glycoprotein in the used cell system. 5. When the absorption of CyA in the gastrointestinal (GI)-tract of healthy volunteers was determined, a remarkable decrease of the plasma AUC could be observed dependent on the location of absorption in the rank order stomach > jejunum/ileum > colon. The decrease in absorption exhibited a marked correlation (r = 0.994) to the expression of mRNA for p-glycoprotein over the GI-tract (stomach < jejunum < colon). 6. All data provide evidence that CyA is a substrate of p-glycoprotein in the GI-tract, which might explain the local differences and the high variability in cyclosporin absorption found in vivo.

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Selected References

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