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Epidermal DR+T6- dendritic cells in inflammatory skin diseases
B S Baker1, S Lambert, A V Powles
1Department of Immunology, St. Mary's Hospital Medical School, London England.
Acta Dermato-Venereologica
|January 1, 1988
Summary
This study found that specific T cells and dendritic cells, including Langerhans
Area of Science:
- Immunodermatology
- Cellular immunology
- Dermatopathology
Background:
- Psoriasis, eczema, pityriasis rosea, and lichen planus are inflammatory skin conditions with distinct clinical presentations.
- Understanding the immune cell infiltrates in these conditions is crucial for elucidating pathogenesis.
- Previous research highlighted specific T cell and dendritic cell patterns in psoriasis.
Purpose of the Study:
- To compare T lymphocyte and dendritic cell subpopulations in endogenous eczema, pityriasis rosea, and lichen planus lesions.
- To investigate the presence and characteristics of DR+T6- dendritic cells in these inflammatory skin conditions.
- To determine if the immune cell profiles observed in other conditions resemble those in psoriasis.
Main Methods:
- Immunohistochemical analysis of T lymphocyte and dendritic cell subpopulations in skin biopsies.
- Quantification of CD4 and CD8 T cells, and epidermal dendritic cells.
- Electron microscopy with immunogold staining to identify dendritic cell lineage in psoriatic lesions.
Main Results:
- All investigated lesions showed a higher proportion of DR+ CD4 T cells than CD8 T cells in both epidermis and dermis, similar to psoriasis.
- Epidermal dendritic cell numbers were significantly increased in endogenous eczema and pityriasis rosea, and variably in lichen planus.
- A distinct DR+T6- dendritic cell subpopulation, identified as Langerhans' cells, was present in all examined inflammatory skin lesions.
Conclusions:
- The preferential activation of CD4 T cells and the presence of a specific Langerhans' cell subpopulation (DR+T6-) are common features across various benign inflammatory skin conditions, not exclusive to psoriasis.
- These findings suggest a shared immunological pathway involving CD4 T cell activation and specific dendritic cell subsets in diverse inflammatory dermatoses.
- The DR+T6- dendritic cells represent a significant component of the immune response in inflammatory skin diseases.