P-glycoprotein (Abcb1) is involved in absorptive drug transport in skin

Journal of Controlled Release : Official Journal of the Controlled Release Society
Katsuaki ItoAkira Tsuji

Abstract

The purpose of the present study was to investigate the role of P-glycoprotein (P-gp) in drug disposition in skin. The distribution of P-gp substrates (rhodamine 123 and itraconazole) to the skin after administration from the epidermal side was lower in P-gp gene knockout (mdr1a/1b(-/-)) mice than that in wild-type mice. Coadministration of propranolol, a P-gp inhibitor, decreased the distribution of itraconazole to the skin in wild-type mice, but not in mdr1a/1b(-/-) mice. These results suggest that P-gp contributes to the influx (from the epidermal side) of its substrates into skin, although P-gp is generally involved in efflux of drugs from various tissues. This finding was supported by the lower vectorial transport of rhodamine 123 from the epidermal to the hypodermal side in mdr1a/1b(-/-) mice in Ussing-type chamber experiments and by the immunohistochemical localization of P-gp throughout the dermal layer. Distribution of itraconazole after intravenous administration, on the other hand, was higher in mdr1a/1b(-/-) mice than that in wild-type mice, suggesting that P-gp transports this drug from the skin to the circulation. The present findings are the first to demonstrate involvement of P-gp in dermal drug disposition.

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