Role of apoptosis in erosive and reticular oral lichen planus exhibiting variable epithelial thickness

Oral lichen planus (OLP) is a chronic inflammatory disease with different clinical types. Reticular and erosive forms are the most common. Although the cause of OLP remains speculative, many findings suggest auto-immune involvement, mediated by T lymphocytes against the basal keratinocytes. Inflamma...

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Published inBrazilian dental journal Vol. 19; no. 3; pp. 179 - 185
Main Authors Brant, Juliana M. Caldeira, Vasconcelos, Anilton C., Rodrigues, Luciana V.
Format Journal Article
LanguageEnglish
Published 2008
Online AccessGet full text
ISSN0103-6440
0103-6440
DOI10.1590/S0103-64402008000300001

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Abstract Oral lichen planus (OLP) is a chronic inflammatory disease with different clinical types. Reticular and erosive forms are the most common. Although the cause of OLP remains speculative, many findings suggest auto-immune involvement, mediated by T lymphocytes against the basal keratinocytes. Inflammation, mechanical trauma or toxic agents can affect the epithelial homeostasia. Increased apoptosis may cause a decrease in epithelial thickness reflecting in the activity of the lesion. The objective of this study was to evaluate the occurrence of apoptosis and epithelial thickness in reticular and erosive forms of OLP. 15 samples of OLP each type (reticular and erosive) plus 10 of healthy mucosa were collected and processed. After morphometry, the apoptotic index and epitelial thickness were obtained. TUNEL and M30 CytoDEATH immunohistochemical assay were used to validate the morphologic criteria used. Apoptosis in the erosive OLP was significantly more intense than in the reticular type and both forms of OLP presented more apoptosis than the healthy oral mucosa. Healthy oral mucosa was thicker than both OLP forms and thicker in OLP reticular form than in the erosive one. The clinical differences between reticular and erosive forms of OLP are related to variations in epithelial thickness and in intensity of apoptosis. O líquen plano oral (LPO) é uma doença inflamatória crônica com diferentes tipos clínicos. As mais comuns são as formas reticular e erosiva. Embora a causa do LPO permaneça no campo especulativo, muitos achados sugerem tratar-se de uma doença auto-imune, mediada por linfócitos T que têm como alvo os ceratinócitos basais. Inflamação, trauma mecânico ou agentes tóxicos podem afetar a homeostasia epitelial. O aumento da apoptose pode levar a uma diminuição da espessura epitelial e isto refletir na atividade da doença. O objetivo deste estudo foi avaliar a ocorrência de apoptose e a espessura epitelial nas formas reticular e erosiva de LPO. 15 amostras de LPO de cada tipo reticular e erosivo, além de 10 amostras de mucosa saudável foram coletadas e processadas. Depois da morfometria, o índice apoptótico (IA) e a espessura do epitélio foram obtidas. Reação de TUNEL e imunohistoquímica do M30 CytoDeath foram usadas para validação dos critérios morfológicos. A apoptose no LPO erosivo foi significativamente maior que no tipo reticular e ambas as formas de LPO apresentaram mais apoptose que a mucosa oral normal. A mucosa oral normal foi mais espessa que ambas as formas de LPO, sendo que, a forma reticular foi mais espessa que o tipo erosivo. As diferenças clínicas entre as formas reticular e erosiva de LPO têm relação com as variações na espessura epitelial e na intensidade da apoptose.
AbstractList Oral lichen planus (OLP) is a chronic inflammatory disease with different clinical types. Reticular and erosive forms are the most common. Although the cause of OLP remains speculative, many findings suggest auto-immune involvement, mediated by T lymphocytes against the basal keratinocytes. Inflammation, mechanical trauma or toxic agents can affect the epithelial homeostasia. Increased apoptosis may cause a decrease in epithelial thickness reflecting in the activity of the lesion. The objective of this study was to evaluate the occurrence of apoptosis and epithelial thickness in reticular and erosive forms of OLP. 15 samples of OLP each type (reticular and erosive) plus 10 of healthy mucosa were collected and processed. After morphometry, the apoptotic index and epitelial thickness were obtained. TUNEL and M30 CytoDEATH immunohistochemical assay were used to validate the morphologic criteria used. Apoptosis in the erosive OLP was significantly more intense than in the reticular type and both forms of OLP presented more apoptosis than the healthy oral mucosa. Healthy oral mucosa was thicker than both OLP forms and thicker in OLP reticular form than in the erosive one. The clinical differences between reticular and erosive forms of OLP are related to variations in epithelial thickness and in intensity of apoptosis. O líquen plano oral (LPO) é uma doença inflamatória crônica com diferentes tipos clínicos. As mais comuns são as formas reticular e erosiva. Embora a causa do LPO permaneça no campo especulativo, muitos achados sugerem tratar-se de uma doença auto-imune, mediada por linfócitos T que têm como alvo os ceratinócitos basais. Inflamação, trauma mecânico ou agentes tóxicos podem afetar a homeostasia epitelial. O aumento da apoptose pode levar a uma diminuição da espessura epitelial e isto refletir na atividade da doença. O objetivo deste estudo foi avaliar a ocorrência de apoptose e a espessura epitelial nas formas reticular e erosiva de LPO. 15 amostras de LPO de cada tipo reticular e erosivo, além de 10 amostras de mucosa saudável foram coletadas e processadas. Depois da morfometria, o índice apoptótico (IA) e a espessura do epitélio foram obtidas. Reação de TUNEL e imunohistoquímica do M30 CytoDeath foram usadas para validação dos critérios morfológicos. A apoptose no LPO erosivo foi significativamente maior que no tipo reticular e ambas as formas de LPO apresentaram mais apoptose que a mucosa oral normal. A mucosa oral normal foi mais espessa que ambas as formas de LPO, sendo que, a forma reticular foi mais espessa que o tipo erosivo. As diferenças clínicas entre as formas reticular e erosiva de LPO têm relação com as variações na espessura epitelial e na intensidade da apoptose.
Author Brant, Juliana M. Caldeira
Vasconcelos, Anilton C.
Rodrigues, Luciana V.
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  organization: Federal University of Minas Gerais, Brazil
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Snippet Oral lichen planus (OLP) is a chronic inflammatory disease with different clinical types. Reticular and erosive forms are the most common. Although the cause...
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Title Role of apoptosis in erosive and reticular oral lichen planus exhibiting variable epithelial thickness
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