Human epidermis reconstructed on synthetic membrane: Influence of experimental conditions on terminal differentiation |
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Authors: | M S Noël-Hudson I Dusser I Collober M P Muriel F Bonté A Meybeck J Font J Wepierre |
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Institution: | (1) Laboratoire de Pharmacologie, Unité de Dermopharmacologie, Faculté de Pharmacie, 5 rue J. B. Clément, 92296 Chatenay-Malabry Cedex, France;(2) Unité Inserm 180. Glycobiologie et reconnaissance cellulaire, Université René Descartes. UFR Biomédicale des Saints-Pères, 45 rue des Saints Pères, 75006 Paris, France;(3) LVMH-Recherche, 25 rue des Peupliers, 92752 Nanterre Cedex, France |
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Abstract: | Summary Cell suspensions of human keratinocytes seeded onto cell culture inserts may undergo terminal differentiation in the absence
of fibroblasts. Among the parameters that control these morphogenic events, exposure to air and the composition of the culture
medium were investigated. In the latter case, three media were considered DMEM:Ham’s F12, MCDB 153, and keratinocyte SFM medium
at equivalent calcium (1.5 mM) and fetal calf serum (5%) concentrations.
Immunochemical methods and transmission electron microscopy show that cells cultured in DMEM:Ham’s F12 medium, and then raised
at the air-liquid interface, form a basal layer plus suprabasal cell layers corresponding to thestratum spinosum, stratum granulosum, andstratum corneum. The suprabasal keratinocyte layers show morphologies that resemble intact skin in which cells are connected by desmosomes
and contain intermediate filaments and keratohyalin-filaggrin granules. When the cultures are kept submerged, the keratinocytes
show occasional keratohyalin granules and are connected by fewer desmosomes. Additionally, no properstratum corneum is formed. In keratinocyte SFM medium and MCDB 153, cultures raised at the air-liquid interface are not able to form an epithelium
of normal architecture and do not express terminal differentiation markers. Differentiation is initiated, however, since desmosomes
and bundles of keratin filaments appear; on the other hand, filaggrin is not expressed even after 28 d in culture. Membrane-bound
transglutaminase is expressed throughout the entire suprabasal compartment in MCDB153 and DMEM:Ham’s F12 media but never appears
in keratinocyte SFM medium.
These studies show the relative independence of epidermal differentiation program to the composition (including the calcium
concentration) of the media contacting the dermis and filling the extracellular space. Conversely, differentiation appears
to depend on elements of basal medium and/or components synthesized by keratinocytes under the influence of the culture medium. |
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Keywords: | keratinocytes differentiation reconstructed epidermis artificial membranes medium |
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