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Keratinization of outer root sheath cells is prevented by contact with inner root sheath of rat hair follicles

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Abstract

The purpose of the present study was to elucidate why keratinocytes of the outer root sheath (ORS) do not keratinize in situ. Two possibilities were considered—inhibition of keratinization is caused by contact of ORS with inner root sheath (IRS) or insufficient supply of keratinization promoting factors from the surrounding tissues to the ORS. In order to distinguish between these possibilities mid-segments of hair follicles were liberated from the dermis by dissection followed by collagenase digestion. ORS cells were then either allowed to migrate from the mid-segments or were kept on the agarose layer which prevented cell spreading and preserved three dimensional structure of hair root. Cultures were stimulated with calcium or EGF, and studied morphologically at the light and transmission electron microscope level. The level of mRNA for differentiation cell markers was also studied by RealTime PCR. ORS cells growing in a medium with low Ca2+ content formed monolayers, which after elevation of Ca2+ produced multilayers with cells containing keratohyalin-like granules. Ca2+ or EGF treatment upregulated expression of involucrin, filaggrin and keratinocyte differentiation associated protein (Kdap). Culture of mid-segments of hair follicles in low calcium culture medium kept on agarose increased expression of filaggrin and Kdap, but downregulated expression of involucrin. Stimulation by Ca2+ further increased expression of filaggrin and Kdap, but had no effect on the level of involucrin expression. EGF stimulated expression of filaggrin only. It is concluded that IRS exerted an inhibitory effect on the expression of involucrin, an essential component of the cornified envelope, thus preventing keratinization of ORS cells in situ. On the other hand, improved access of nutrients or promoting factors of keratinization to the mid-segment of hair follicles augmented expression of filaggrin and Kdap, proteins engaged in the differentiation of keratinocytes but not involved in its terminal phase.

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Supported by Warsaw Medical University.

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  1. Department of Histology and Embryology, Medical University of Warsaw, Chalubinskiego 5, 02-004, Warsaw, Poland

    Justyna Niderla-Bielinska, Ewa Jankowska-Steifer & Stanislaw Moskalewski

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  1. Justyna Niderla-Bielinska
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Correspondence to Stanislaw Moskalewski.

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Niderla-Bielinska, J., Jankowska-Steifer, E. & Moskalewski, S. Keratinization of outer root sheath cells is prevented by contact with inner root sheath of rat hair follicles. Arch Dermatol Res 301, 337–345 (2009). https://doi.org/10.1007/s00403-008-0876-8

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