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Structural and ultrastructural evidence regarding immunologically mediated-pathogenesis in mucosal lichen planus
1Department of Cellular Biology and Histology, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania.
Summary
This study examined oral and genital lichen planus (L. P.) tissues using microscopy. Findings reveal distinct ultrastructural changes supporting an immunologically mediated pathogenesis theory for lichen planus.
Area of Science:
- Oral pathology
- Dermatopathology
- Immunodermatology
Background:
- Lichen planus (L. P.) is an inflammatory condition affecting skin and mucous membranes.
- Understanding its pathogenesis is crucial for effective treatment strategies.
Purpose of the Study:
- To define structural and ultrastructural changes in oral and genital lichen planus.
- To correlate these changes with the immunologically mediated pathogenesis theory.
Main Methods:
- Light microscopy and transmission electron microscopy were used.
- Tissue samples from six patients with oral and genital lichen planus were analyzed.
Main Results:
- Classical histopathological features like hydropic degeneration of basal keratinocytes and colloid bodies were observed.
- Differences from skin L. P. included parakeratosis, epithelial atrophy, and altered granular layer.
- Ultrastructural analysis showed basal lamina disruption, degenerated basal keratinocytes, and increased Langerhans cells.
- The inflammatory infiltrate comprised T-lymphocytes, activated macrophages, B-lymphocytes, and plasma cells.
Conclusions:
- Microscopic findings support an immune-mediated pathogenesis for oral and genital lichen planus.
- Specific ultrastructural alterations provide further insight into the disease mechanism.