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Lymphocyte subsets and Langerhans cells/indeterminate cells in erythema multiforme
The Journal of Investigative Dermatology
|November 1, 1983
Summary
Erythema multiforme involves changes in T lymphocytes and Langerhans cells/indeterminate cells (LC/IC). T8+ cells dominate the epidermis, while T4+ cells are more numerous in the dermis, suggesting a role for cellular immunity in this condition.
Area of Science:
- Immunodermatology
- Cellular immunology
- Histopathology
Background:
- Erythema multiforme (EM) presents complex clinical and histological changes.
- The precise immunopathogenesis of EM remains incompletely understood.
- Previous studies suggest a role for inflammatory cells in EM development.
Purpose of the Study:
- To investigate the distribution and changes of T lymphocytes and Langerhans cells/indeterminate cells (LC/IC) in various stages of Erythema Multiforme.
- To elucidate the cellular immune mechanisms underlying the pathogenesis of EM.
Main Methods:
- Peroxidase-antiperoxidase technique utilizing monoclonal antibodies.
- Analysis of T8+ (cytotoxic/suppressor) and T4+ (helper/inducer) lymphocytes.
- Assessment of T6+ (LC/IC) cell populations in normal skin, developing lesions, and fully formed blisters of EM.
Main Results:
- Epidermal T8+ cells outnumbered T4+ cells, while dermal T4+ cells exceeded T8+ cells in EM lesions.
- An increase in T6+ (LC/IC) cells was observed in the epidermis during initial EM changes.
- LC/IC numbers decreased in the epidermis with increasing basal cell layer destruction and epidermal necrosis, particularly in severe cases.
Conclusions:
- Cellular immune mechanisms, with lymphocytes as key effector cells, contribute to the immunopathogenesis of Erythema Multiforme.
- Langerhans cells/indeterminate cells (LC/IC) likely play a role in the development and progression of EM.
- The observed patterns of immune cell infiltration and LC/IC redistribution in EM share similarities with allergic contact dermatitis.