Related Experiment Videos
Pityriasis lichenoides et varioliformis acuta immunohistopathologic study
1Department of Dermatology, Jichi Medical School, Minami-kawachi-machi, Kawachi-gun, Tochigi-ken, Japan.
The Journal of Dermatology
|October 1, 1977
Summary
Pityriasis lichenoides et varioliformis acuta (PLVA) involves immune complex vasculitis. Immunoglobulin M and complement deposits in skin lesions suggest classical complement pathway activation in PLVA disease.
Area of Science:
- Immunodermatology
- Pathology
- Rheumatology
Background:
- Pityriasis lichenoides et varioliformis acuta (PLVA) is an uncommon inflammatory skin condition.
- The exact pathogenesis of PLVA remains incompletely understood.
Observation:
- Immunoglobulin M (IgM) and complement components (Clq, C3, C9) were detected in the walls of affected blood vessels and skin lesion basement membranes.
- Intense fluorescence was observed in blood vessels with inflammatory infiltrates and fibrinoid changes.
- Absence of C3 activator, fibrin, and albumin deposits was noted.
Findings:
- The deposition pattern suggests an immune complex-mediated vasculitis.
- Findings indicate potential activation of the classical complement pathway in PLVA.
- Elevated serum IgM levels were observed in the studied patients.
Implications:
- These findings support an immune-mediated mechanism in the pathogenesis of PLVA.
- Understanding the role of complement may lead to targeted therapies for PLVA.
- Further research into immune complex deposition in PLVA is warranted.