Abstract
Purpose. The purpose of this work was to determine the jejunal permeability of cyclosporin A (CsA) in humans and whether formulation variables modulate the effects of P-glycoprotein (P-gp) on the permeability of CsA in Caco-2 cells.
Methods. A solution containing CsA, phenylalanine, propranolol, polyethyleneglycol (PEG) 400, and PEG 4000 was perfused through a 10-cm jejunal segment in 12 subjects. Caco-2 transport studies were performed using previously reported methodology.
Results. The mean P eff (±SD) of CsA in humans was 1.65 (0.53). The mean permeabilities for phenylalanine, propranolol, and PEG 400 were 4.54 (2.39), 2.90 (1.28), and 0.83 (0.51) × 10-4 cm/s, respectively. The presence of surfactants significantly decreased the permeabilities of CsA in both directions in Caco-2 cells.
Conclusions. The results suggest that the effects of surfactants via micellar solubilization and inhibition of P-gp efflux on CsA transport in Caco-2 cells are significant. CsA can rightly be classified as a low solubility-high permeability Class II BCS drug and its highly variable absorption from Sandimmune® oral formulations is the result of poor dissolution characteristics.
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Chiu, YY., Higaki, K., Neudeck, B.L. et al. Human Jejunal Permeability of Cyclosporin A: Influence of Surfactants on P-Glycoprotein Efflux in Caco-2 Cells. Pharm Res 20, 749–756 (2003). https://doi.org/10.1023/A:1023481418576
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DOI: https://doi.org/10.1023/A:1023481418576