A Potential Role for Superantigens in the Pathogenesis of Psoriasis
| Autor: | Donald Y.M. Leung, Patrick Walsh, Ralph Giorno, David A. Norris |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Adult
medicine.drug_class Staphylococcus Exotoxins Dermatology Monoclonal antibody Major histocompatibility complex Immunofluorescence Biochemistry Minor Lymphocyte Stimulatory Antigens Pathogenesis Enterotoxins Psoriasis medicine Superantigen Humans Antigen-presenting cell Molecular Biology Skin biology medicine.diagnostic_test T-cell receptor Streptococcus Cell Biology Middle Aged medicine.disease Immunology biology.protein Female |
| Zdroj: | Journal of Investigative Dermatology. 100(3):225-228 |
| ISSN: | 0022-202X |
| DOI: | 10.1111/1523-1747.ep12468941 |
| Popis: | Psoriasis is a complex inflammatory skin disease in which local vascular changes, T-cell activation, abnormal keratinocyte proliferation and differentiation, and neutrophil activation all contribute to the ongoing disease process. Because of recent interest in T-cell activation as a trigger for psoriatic lesions, we hypothesized that psoriasis may be triggered by superantigens, e.g., toxins of microbial origin that stimulate T cells expressing particular T-cell receptor (TCR) beta chain variable (V beta) gene segments. Lesional skin biopsies and peripheral blood from two patients with acute exacerbations of their psoriasis that appeared to be triggered by infection were analyzed for TCR V beta gene expression using monoclonal antibodies directed against V beta 5.1, 5.2, 6.7, 8.1, and 12. Skin biopsies from both patients demonstrated a different pattern of V beta expansion that correspond to the V beta pattern expected to be induced by the type of superantigen expressed during the infection. In contrast, using immunofluorescence and flow cytometry, peripheral blood T cells from these patients did not demonstrate any expansion of the 5 V beta subsets studied. These observations support the hypothesis that local activation of cutaneous T cells in psoriasis may be caused by a superantigen and provides a new direction for investigating the pathogenesis of this complex and fascinating skin disorder. |
| Databáze: | OpenAIRE |
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