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Influence of Morphometric Factors on Quantitation of Paracellular Permeability of Intestinal Epithelia In Vitro

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Abstract

Purpose. The relative contribution of the small and large intestine to paracellular absorption is a subject of some controversy. Direct comparison of paracellular permeability in different epithelia is complicated by variations in junctional density and/or the absorptive surface area.

Methods. This study used a combination of morphometric analyses and in vitro absorption studies to define permeability characteristics in relation to the amount of paracellular pathway present in rat ileum, colon and the model epithelium, Caco-2.

Results. Mucosal to serosal amplification was higher in ileum (3.9) than colon (1.9) or Caco-2 (1). Tight junctional density (1p) of ileal crypts was ≈3 fold greater (91 m/cm2) than that measured in ileal villi, colonic surface and crypt cells or Caco-2 monolayers (34−37 m/ cm2). However, when the relative contributions of the crypts and villi was taken into account there was no significant difference in the mean 1p per mucosal area for the three epithelia studied. Using these data to correct for morphometric differences the permeabilities of a range of small hydrophilic molecules (atenolol, D-PheAsp and PEG oligomers MW 282-634) was measured. Permeability of rat ileum and colon were virtually identical for all compounds studied. In contrast, Caco-2 monolayers showed a significantly lower permeability than intestinal tissues with the difference increasing markedly with molecular size.

Conclusions. These studies suggest the importance of accounting for morphological variation when comparing the permeability characteristics of different epithelial systems.

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Authors and Affiliations

  1. Department of Medicine (, University of Manchester School of Medicine), Hope Hospital, Salford, M6 8HD, UK

    Andrew Collett, David Walker, Erika Sims, Peter Speers & Geoffrey Warhurst

  2. Department of Pharmacy, University of Manchester, Manchester, Ml3 9PL, UK

    Yan-Ling He & Malcolm Rowland

  3. GlaxoWellcome, Greenford, Middlesex, UK

    John Ayrton

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  1. Andrew Collett
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  2. David Walker
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  3. Erika Sims
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  4. Yan-Ling He
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  7. Malcolm Rowland
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  8. Geoffrey Warhurst
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Correspondence to Geoffrey Warhurst.

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Collett, A., Walker, D., Sims, E. et al. Influence of Morphometric Factors on Quantitation of Paracellular Permeability of Intestinal Epithelia In Vitro. Pharm Res 14, 767–773 (1997). https://doi.org/10.1023/A:1012154506858

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