Related Experiment Videos
Immunopathogenesis of oral lichen planus
L J Walsh1, N W Savage, T Ishii
1Department of Dermatology, University of Pennsylvania, Philadelphia.
Insights
Oral lichen planus involves a cell-mediated immune response targeting modified keratinocytes. Key cells include mast cells and Langerhans cells, with cytokines potentially driving chronicity.
Area of Science:
- Immunology
- Dermatology
- Oral Medicine
Background:
- Oral lichen planus (LP) is a prevalent inflammatory condition affecting oral mucosa.
- Cell-mediated immunity is implicated as a primary driver of oral LP pathogenesis.
Purpose of the Study:
- To present a unifying hypothesis integrating cellular and molecular immune signals in oral LP.
- To elucidate the roles of keratinocytes, mast cells, and Langerhans cells in the immune response.
Main Methods:
- The study proposes a theoretical model based on existing literature.
- It integrates concepts of antigen presentation, immune cell interactions, and cytokine signaling.
Main Results:
- Modified keratinocyte surface antigens are identified as targets for cytotoxic T-cell responses in oral LP.
- Mast cell degranulation and subsequent adhesion molecule expression facilitate lymphocyte infiltration.
- Interactions between lymphocytes and keratinocytes are crucial in the effector phase of the lesion.
Conclusions:
- The hypothesis integrates key cellular and molecular events in oral LP.
- Cytokine-mediated interactions between lymphocytes and keratinocytes may promote disease chronicity.
- Modulating these immunologic events presents a potential therapeutic strategy for oral LP.
Abstract:
Oral lichen planus (LP) is a common mucosal disorder in which cell mediated immunity is thought to play a major role. In this paper, a unifying hypothesis which attempts to integrate cellular and molecular signals in the local immune response in oral LP is presented. In this model, modified keratinocyte surface antigens are the target for the cytotoxic cell response which characterizes oral LP, whereas mast cells and antigen presenting Langerhans cells are key cellular elements in the evolving lesion. It has been established that mast cell degranulation induces adhesion molecule expression on endothelium which facilitates lymphocyte homing to the tissues. These adhesive interactions between lymphocytes and keratinocytes are postulated to be important determinants in the effector phase of the lesion. Cytokines produced by both lymphocytes and keratinocytes which influence the local immune response could promote chronicity. Accordingly, modulation of immunologic events is a potential therapeutic approach for oral LP.