Apoptosis-associated markers in oral lichen planus

Journal of Oral Pathology & Medicine : Official Publication of the International Association of Oral Pathologists and the American Academy of Oral Pathology
N P DekkerJ A Regezi

Abstract

Hypothesizing that loss of basal cells in oral lichen planus is due to apoptosis, we evaluated LP specimens for apoptosis-regulating proteins [positive regulators Bcl-xS, Bax, Fas/Fas-ligand, p53, and negative regulators (anti-apoptotic) Bcl-2, Bcl-xL and compared results with reactions in normal mucosa and chronically inflamed gingiva. Also, sections were evaluated with an in situ TUNEL assay that identifies apoptotic DNA fragments. Basal keratinocytes in normal buccal mucosa, nonspecific gingivitis, and LP were negative for Bcl-2 protein, but melanocytes and lymphoid cells were positive. Keratinocyte staining for Bcl-x was negative to weak in normal buccal mucosa and gingivitis, and moderate in LP. Keratinocytes (especially upper prickle cells) in all tissues stained similarly for Bax at weak to moderate levels. Also, no differences in Fas and Fas-ligand staining were evident. Prominent p53-positive staining was seen in all LP biopsies (10-100% of basal keratinocytes) but not in normal buccal mucosa and gingivitis. Few basal keratinocytes in 5/10 LP cases exhibited a positive in situ signal for DNA fragment-associated apoptosis. That the Bcl-2 family of proteins and Fas/Fas-ligand were detected in normal and diseased tissues,...Continue Reading

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