In the past three decades, many studies have analyzed ultrastructural and molecular markers of differentiation in squamous stratified epithelial tissues. In these tissues, epithelial cells migrating from the basal layer to the upper layers undergo drastic changes, which involve membrane-associated proteins, DNA synthesis, phenotypic aspects, lipid composition, and cytoskeletal components. Cytoskeletal components include a large and heterogeneous group, including intermediate filaments, components of the cornified envelope, and of the stratum corneum. When grown in mono- and multilayer cell cultures, epithelial cells isolated from the oral mucosa may reproduce many of the biochemical and morphological aspects of epithelial tissue in vivo. In the present paper, we examine phenotypic changes, development of suprabasal layer, and Involucrin expression occurring in differentiating oral epithelial cells, based on literature review and original data.
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