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Altered CD40 and E-cadherin expression--putative role in oral lichen planus
E Neppelberg1, L L Loro, G Oijordsbakken
1Oral Pathology and Forensic Odontology, Institute of Oral Sciences, Faculty of Dentistry, University of Bergen, Bergen, Norway. evelyn.neppelberg@odont.uib.no
Summary
Oral lichen planus involves basal cell apoptosis. T cells expressing CD40 ligand may drive this, while reduced E-cadherin contributes to epithelial damage in OLP.
Area of Science:
- Oral pathology
- Immunodermatology
Background:
- Oral lichen planus (OLP) is characterized by basal keratinocyte apoptosis.
- Investigating regulatory mechanisms of apoptosis in OLP is crucial.
Purpose of the Study:
- To investigate the expression of CD40, CD40 ligand (CD40L), CD44, and E-cadherin in OLP.
- To understand the role of these molecules in basal cell apoptosis in OLP.
Main Methods:
- Immunohistochemistry was used to detect CD40, CD40L, E-cadherin, CD44, Laminin-5, and Collagen IV in 22 OLP patient biopsies.
- Double-labeling for CD40 and CD3, and in situ mRNA hybridization for CD40 and CD40L were performed.
Main Results:
- Basal keratinocytes in active OLP lesions lacked CD40 expression and showed focal E-cadherin negativity.
- Intraepithelial T cells expressed CD40 and CD40L, suggesting a role in OLP's inflammatory response.
- Non-diseased areas and normal oral mucosa showed different expression patterns compared to active OLP lesions.
Conclusions:
- T cells may regulate OLP inflammation through CD40-CD40L interactions.
- Downregulation of CD40 in basal keratinocytes might protect them from CD40-CD40L-induced apoptosis.
- Loss of E-cadherin may facilitate epithelial damage and T-cell infiltration in OLP.
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