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Th1 cytokines in oral lichen planus
Ambereen Khan1, Camile S Farah, Neil W Savage
1Oral Biology and Pathology, The University of Queensland, St Lucia, Brisbane, Queensland, Australia.
Summary
Oral lichen planus (OLP) involves CD8+ T-cells and cytokines like interferon-gamma (IFN-γ) and tumor necrosis factor-alpha (TNF-α). These findings suggest a T helper 1 immune response promoting cytotoxic T-cell activity in OLP.
Area of Science:
- Immunology
- Oral Pathology
Background:
- Cell-mediated immunity in oral lichen planus (OLP) is influenced by cytokines and their receptors.
- Understanding these interactions is crucial for OLP pathogenesis.
Purpose of the Study:
- To investigate the role of cytokines and their receptors in cell-mediated immune responses in OLP.
- To characterize the immune cell infiltrate and cytokine expression profiles in OLP lesions.
Main Methods:
- In situ cytokine expression was analyzed using immunohistochemistry.
- In vitro cytokine secretion from OLP lesional T cells was assessed via ELISA.
- Immune cell populations were identified using CD markers (CD4+, CD8+).
Main Results:
- CD8+ T-cells were the predominant mononuclear cells in OLP lesions, with some adjacent to degenerating keratinocytes.
- IFN-γ and TNF-α were expressed by mononuclear cells and keratinocytes, with basal keratinocytes showing continuous TNF-α expression.
- OLP T-cells secreted IFN-γ in vitro, which was modulated by TNF-α stimulation; IL-4, IL-10, and TGF-β1 were not detected.
Conclusions:
- The data indicate a T helper 1 (Th1) immune response in OLP.
- This Th1 response may drive CD8+ cytotoxic T-cell activity, contributing to OLP development.