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Macrophages in oral lichen planus
Abstract:
The presence and distribution of macrophages within 15 non-ulcerated lesions of oral lichen planus was investigated using an immunoperoxidase technique for the detection of the macrophage markers lysozyme and alpha 1 antitrypsin. All specimens contained mononuclear lysozyme and alpha 1 antitrypsin positive cells which were concentrated in a band immediately beneath the epithelium and often associated with areas of damaged basal cells. Cell counts revealed that 11% of the positive cells were in the epithelium and 89% in the lamina propria. Approximately 61% of all positive cells were found within a 125 micron wide zone centred on the basement membrane. These results suggest that in oral lichen planus macrophages are in close proximity to the epithelial basal cells, where cell damage occurs, and play a role in the pathogenesis of this condition.
Insights
Macrophages are concentrated near damaged basal cells in oral lichen planus, suggesting a role in the condition's development. This study investigated their distribution in non-ulcerated lesions.
Area of Science:
- Oral pathology
- Immunohistochemistry
- Cell biology
Background:
- Oral lichen planus (OLP) is a chronic inflammatory condition affecting oral mucosa.
- The role of immune cells, particularly macrophages, in OLP pathogenesis is not fully understood.
Purpose of the Study:
- To investigate the presence and distribution of macrophages in non-ulcerated oral lichen planus lesions.
- To determine the association of macrophages with epithelial damage in OLP.
Main Methods:
- Immunoperoxidase technique used to detect macrophage markers (lysozyme, alpha 1 antitrypsin).
- Analysis of 15 non-ulcerated oral lichen planus specimens.
- Quantification of macrophage distribution relative to the epithelium and basement membrane.
Main Results:
- All specimens showed mononuclear cells positive for lysozyme and alpha 1 antitrypsin.
- Macrophages were concentrated in a band beneath the epithelium, near damaged basal cells.
- 89% of macrophages were located in the lamina propria, with 61% within 125 microns of the basement membrane.
Conclusions:
- Macrophages are closely associated with epithelial basal cells in oral lichen planus.
- Their proximity to sites of cell damage suggests a significant role in OLP pathogenesis.
- Further research into macrophage function in OLP is warranted.