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Comparison of tight junction permeability for albumin in iris pigment epithelium and retinal pigment epithelium in vitro

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Abstract

• Background: The degenerative retinal diseases are one of the major causes of visual loss in the western world. Although heterologous RPE transplants rescue the photoreceptors in the dystrophic rat model, rejection remains a major limiting factor. Given the common embryonic origin, iris pigment epithelial (IPE) cells might be able to take over the functions of retinal pigment epithelial (RPE) cells, serving as an autologous graft for transplantation and thereby preventing rejection. One of the main functions of RPE cells is the generation of tight junctions which form the outer blood-retinal barrier. In this study we compared the tight junction permeabilities of IPE and RPE cells isolated from Long Evans rats by measuring their albumin clearances. • Methods: IPE and RPE cells were cultured on semipermeable filter supports with and without the addition of 0.02% ethylene diaminetetraacetic acid (EDTA). At selected intervals, the albumin clearances of the IPE and RPE cells were measured spectrophotometrically and compared. The morphology of the cells was compared using electron microscopy and fluorescent labeling. • Results: IPE and RPE cells both restricted the passage of albumin in vitro. After the modulation of tight junctions with 0.02% EDTA, the clearance increased in both types of cells in a similar fashion. The morphology of tight junctions was visualized with electron microscopy. • Conclusion: These results indicate that the functional barrier for macromolecules is similar in IPE and RPE cells in vitro. This raises the possibility that IPE cells would form tight junctions in the subretinal space, thereby substituting for the blood-retinal barrier normally formed by RPE cells.

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Authors and Affiliations

  1. Department of Ophthalmology, University of Cologne, Joseph- Stelzmann-Strasse 9, D-50931, Cologne, Germany

    Alexandra Lappas & Klaus Heimann

  2. Department of Ophthalmology and Visual Sciences, The University of Chicago, 939 East 57th Street, 60637, Chicago, IL, USA

    Kourous A. Rezai

  3. Department of Ophthalmology, University of Leipzig, Liebig Strasse 22, Leipzig, Germany

    Leon Kohen & Peter Wiedemann

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  1. Kourous A. Rezai
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  2. Alexandra Lappas
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  5. Klaus Heimann
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Rezai, K.A., Lappas, A., Kohen, L. et al. Comparison of tight junction permeability for albumin in iris pigment epithelium and retinal pigment epithelium in vitro. Graefe's Arch Clin Exp Ophthalmol 235, 48–55 (1997). https://doi.org/10.1007/BF01007837

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  • DOI: https://doi.org/10.1007/BF01007837

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