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The Langerhans cell.

G Rowden

    Critical Reviews in Immunology
    |December 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Langerhans cells are the primary epidermal cells expressing Ia antigens in mammals. These cells, along with indeterminate cells expressing HLA-DR antigens, play a role in immune responses, particularly in the cornea and skin allograft rejection.

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    Area of Science:

    • Immunology
    • Dermatology
    • Cell Biology

    Background:

    • Langerhans cells are unique epidermal cells identified by Ia antigen expression across mammalian species.
    • Previous studies suggested a role for Langerhans cells in immune surveillance and response.

    Purpose of the Study:

    • To identify and characterize Langerhans cells in mammalian epidermis using specific immunological markers.
    • To investigate the presence and distribution of Langerhans cells in the corneal epithelium.
    • To explore the potential role of Langerhans cells in allograft rejection.

    Main Methods:

    • Xeno-antisera against B-lymphocyte membrane antigens and alloantisera against I-A and I-EC subregion products were used for staining.
    • Immunofluorescence, immunoperoxidase, and immunoferritin techniques were employed.

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  • Electron microscopy confirmed staining specificity.
  • ATPase staining assessed Langerhans cell presence in the cornea.

    • Main Results:

    • Langerhans cells were confirmed as the sole epidermal cells expressing Ia antigens in humans and mice.
    • Indeterminate epidermal cells also expressed HLA-DR antigens, suggesting a relationship with Langerhans cells.
    • Langerhans cells were absent in the central corneal epithelium but present in the limbus.
    • Corneal epithelium could be populated with Langerhans cells upon irritation or sensitization.

    Conclusions:

    • Langerhans cells are key immune cells in the epidermis, expressing specific antigens.
    • Their presence in the cornea is dynamic and can be influenced by external stimuli.
    • Further research involving corneal grafting is proposed to elucidate the role of Langerhans cells in allograft rejection.