Basal detachment of the epidermis using dispase: tissue spatial organization and fate of integrin α6β4 and hemidesmosomes

Yves Poumay, Isabelle H. Roland, Michèle Leclercq-Smekens, Robert Leloup

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Dispase has been utilized to produce basal detachment of the epidermis of human skin biopsies and to study the consequences induced afterwards during incubations of the detached tissue. Spatial reorganization of the epidermis is observed under these conditions and is characterized by disappearance of the typical basal keratinocyte layer. Immunofluorescent labelings reveal upward migration of several cells exhibiting the basal phenotype between suprabasal differentiating keratinocytes and demonstrate progressive intracellular expression of hemidesmosomal components: the integrin α6β4 and two plaque components, the 230-kDa bullous pemphigoid antigen and HD1, a 500-kDa protein. Using electron microscopy and immunogold techniques, we demonstrate that the hemidesmosome-containing basal membrane domains enter the cell cytoplasm after detachment of the epidermal tissue. Partial recycling of internalized hemidesmosomal components is also suggested. Our findings illustrate the processing of released hemidesmosomes in detached basal keratinocytes and suggest some heterogeneity between basal cells migrating towards a suprabasal position and those remaining in the basal layer. These results suggest that the dispase-detached epidermis is a self-remodeling tissue in which basal keratinocytes' and tissue's polarities observed in the anchored epidermis are progressively changing.

    Original languageEnglish
    Pages (from-to)111-117
    Number of pages7
    JournalJournal of Investigative Dermatology
    Volume102
    Issue number1
    Publication statusPublished - Jan 1994

    Keywords

    • bullous pemphigoid antigen
    • HD1
    • internalization
    • keratinocyte

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