Characterization of label-retaining cells in the epidermis of a human skin equivalent.

Abstract:

:The human skin equivalent (HSE) is an in vitro reconstructed model that resembles skin morphologically and biochemically. The HSE is formed by overlaying a fibroblast-populated collagen matrix with a suspension of epidermal cells. Basal keratinocytes attach to the dermal equivalent via a newly formed basement membrane and multiply to form a stratified, differentiated epidermis. The aim of the studies described here was to characterize the basal cells of the HSE in terms of their cell cycling potential. The experiments utilized long-term labelling of the cells with tritiated thymidine ([3H]dT), followed by irradiation with ultraviolet light. [3H]dT incorporation was analysed via routine autoradiography. Irradiation with 100 J/m2 UV light increased the number of labelled basal cells by 58% over the control, the maximal stimulation observed. Decreased numbers of labelled basal cells were observed at doses of UV light greater than 100 J/m2. The maximal number of labelled basal cells was observed on day 14 and decreased over time; the number of labelled suprabasal cells increased concomitantly. Label-retaining cells (12%) persisted in the stratum basale of control HSEs after 32 days in culture. Labelled cells were observed in the apical layers of the stratum granulosum of control HSEs after 22 days in culture. These data suggest that the stratum basale of the HSE contains a population of slow-cycling cells whose characteristics resemble a subpopulation of slowly cycling cells found in normal human skin.

journal_name

Cell Prolif

journal_title

Cell proliferation

authors

Graeter LJ,Hull BE

doi

10.1111/j.1365-2184.1996.tb00981.x

subject

Has Abstract

pub_date

1996-12-01 00:00:00

pages

679-88

issue

12

eissn

0960-7722

issn

1365-2184

journal_volume

29

pub_type

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