ABSTRACT
Background: Oral submucous fibrosis (OSF) is an insidious, chronic, disabling disease, in which there is lack of perfusion due to reduced level of the vasculature and this is said to be responsible for the epithelial atrophy seen in OSF. The degree of vasculature of the affected mucosa and its effects on the epithelial thickness remains controversial till date. Aims: This study attempts to analyze the role of angiogenesis in OSF and its progression using vascular endothelial growth factor (VEGF) and CD34 markers. Materials and Methods: The study samples for the present study comprised of 10 cases each of early OSF, moderately advanced, advanced OSF, and 10 cases of normal oral mucosa were used as controls. All the cases were subjected to immunohistochemical staining with VEGF and CD34 markers. Results: Among the different grades of OSF, we did not find any noticeable difference in VEGF expression although we found a upregulation in microvessel density (CD34) in early and moderately advanced OSF followed by a downregulation in advanced OSF. Conclusions: As the disease progresses, there is an increased production of the extracellular matrix component (collagen I and II and fibronectin) and results in fibrosis. Subsequently, it leads to the reduction in the level of corium vascularity and results in hypoxia which ultimately causes reduction and constriction of the vascular channels. This sequence of events alerts us to the relevance of early disease diagnosis and management in an irreversible pathology such as OSF.
ABSTRACT
Objective: To evaluate a potential role of HSP70 in the pathogenesis of oral lichen planus (OLP). Materials and methods: The study sample comprised of 30 samples of histopathologically confirmed cases of OLP, which were grouped on the basis of the thickness of the epithelial layer into atrophic, normal (classical) and acanthotic. An immunohistochemical analysis of the expression of HSP-70 protein was done, followed by a quantitative and qualitative analysis of the stained layers. The results were statistically analyzed. Results: An increased expression of HSP70 was noted in the basal and suprabasal cells of the epithelium of OLP. A higher count and intensity of HSP70 expression was seen in the basal layer of the epithelium. Greater expression was noted in the epithelium of the atrophic group. Conclusion: The expression pattern of HSP70 positively implicates it in the pathogenesis of OLP. A potential role of HSP 70 usage as therapeutic modality is suggested.
Objetivo: Avaliar o potencial papel do HSP70 na patogênese do líquen plano bucal (LPB). Materiais e métodos:A amostra foi composta de casos histologicamente confirmados de LPB, os quais foram agrupados em função da espessura da camada epitelial em atrófica, normal (clássica) e acantose. Uma análise imuno-histoquímicada expressão da proteína HSP70 foi feita, seguida por uma análise quantitativa e qualitativa dascamadas coradas. Os resultados foram analisados estatisticamente. Resultados: Um aumento da expressãode HSP70 foi observado nas células basais e suprabasais do epitélio de LPB. A maior contagem e intensidadede expressão HSP70 foi vista na camada basal do epitélio. Maior expressão foi observada no epitélio do grupoatrófica. Conclusão: O padrão de expressão de HSP70 demonstrou uma ação positiva do mesmo na patogêneseda LPB. O uso do HSP70 como modalidade terapêutica do LPB é sugerido.