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Physicochemical Properties and Transport of Steroids Across Caco-2 Cells

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Abstract

Purpose. The purpose of this work was to study the relevant physicochemical properties for the absorption of steroids.

Methods. Various physicochemical properties of steroids were calculated (molecular weight, ClogP, static polar surface area [PSA], etc.). Within this series of steroids, different pharmacological groups were defined. Based on the outcome of this survey, steroids were selected for the Caco-2 permeability study. The apparent permeability coefficients (Papp) were related to the calculated and measured physicochemical properties.

Results. Between the defined groups of steroids, ClogP was the most discriminative descriptor. The steroids were well transported over the cell monolayers and the Papp was independent of the concentration and the transport direction. No relationship was found with the PSA; however, the Papp showed a weak inverse correlation with ClogP.

Conclusions. The molecular descriptors and Papp values showed that all steroids are well transported. The small differences in the Papp values showed a weak inverse correlation with ClogP: the hydrophilic steroids (ClogP approximately 0-2) tend to diffuse faster over the cell monolayers compared with the more hydrophobic steroids (ClogP approximately 5). The relationship with ClogP suggests that partitioning of steroids between the biologic membrane and the surrounding aqueous phase is one of the main mechanisms for absorption.

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Authors and Affiliations

  1. Department of Pharmaceutics, NV Organon, P.O. Box 20, 5340 BH, Oss, The Netherlands

    Fried Faassen, Johan Lenders & Herman Vromans

  2. Department of Molecular Design and Informatics, NV Organon, P.O. Box 20, 5340 BH, Oss, The Netherlands

    Jan Kelder

  3. Department of Explanatory Toxicology, TNO Nutrition and Food Research Institute, P.O. Box 360, 3700 AJ, Zeist, The Netherlands

    Rob Onderwater

  4. Department of Pharmaceutics, University of Utrecht, Utrecht, The Netherlands

    Herman Vromans

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  1. Fried Faassen
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Correspondence to Fried Faassen.

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Faassen, F., Kelder, J., Lenders, J. et al. Physicochemical Properties and Transport of Steroids Across Caco-2 Cells. Pharm Res 20, 177–186 (2003). https://doi.org/10.1023/A:1022210801734

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