丝聚蛋白在口腔黏膜下纤维性变中的表达

目的研究丝聚蛋白(filaggrin,FLG)在口腔黏膜下纤维性变(oral submucous fibrosis,OSF)组织中的表达与分布,探讨FLG在OSF发生发展中的意义。方法选取10例人正常口腔颊黏膜组织(正常口腔黏膜组)和OSF早期(OSF早期组)、中期(OSF中期组)、晚期(OSF晚期组)各10例颊黏膜组织,采用免疫组织化学方法检测各组FLG的表达和分布情况,观察FLG在上皮中的表达情况,对FLG表达阳性的细胞进行计数,计算各组的FLG阳性细胞表达率。结果正常口腔颊黏膜组大部分标本上皮中FLG表达为阴性;OSF颊黏膜上皮中均可见FLG的阳性表达,随着OSF病变程度加重,FLG阳性表达细胞数目增加。在OSF早期组FLG阳性表达主要集中在上皮的颗粒层和角化层,OSF中期组FLG阳性表达的上皮细胞逐渐增多;在OSF晚期组中几乎整个上皮层细胞可见胞浆胞核中呈FLG阳性表达。OSF早期组、OSF中期组、OSF晚期组的FLG阳性细胞表达率分别为(24.63±9.06)%、(54.23±10.63)%和(83.97±8.72)%,且OSF组中的FLG阳性细胞表达率均高于正常黏膜组(P<0.05),差异具有统计学意义。结论 FLG在OSF上皮中表达较正常口腔黏膜上皮增强,且随着OSF病变加重,FLG在OSF上皮中的表达水平上调。FLG的表达异常可能与OSF上皮角质形成细胞的终末分化发生紊乱有关。

The expression of filaggrin in oral submucosal fibrosis

Objective To study the expression and distribution of filaggrin(FLG) in oral submucous fibrosis(OSF and to explore the significance of FLG in the occurrence and development of OSF. Methods Ten cases with a normal oral mucosa(normal buccal mucosa group) and 30 cases of tissues with OSF lesions, including 10 cases each in the early(early OSF group), moderate(middle OSF group) and advanced stages(late OSF group), were selected. FLG was analyzed by immunohistochemistry. The FLG-positive cells were counted to calculate the percentages of cells with FLG-positive expression in each group. Results FLG expression was negative in most of the normal buccal mucosa group specimens and was positive in the OSF buccal mucosal epithelial specimens. With aggravation of the OSF lesion, the number of FLG-positive cells increased. In the early OSF group, FLG-positive expression was mainly concentrated in the granular and keratinized epithelial layers. In the middle OSF group, the number of FLG-positive epithelial cells increased gradually. In the late OSF group, almost all epithelial cells were FLG-positive in the cytoplasmic nucleus. The percentages of FLG-positive cells in the early, middle and late OSF groups were(24.63 ± 9.06)%,(54.23 ± 10.63)% and(83.97± 8.72)%, respectively. The percentage of FLG-positive cells was significantly higher in the OSF group than in the normal mucosa group(P 0.05). Conclusion FLG was expressed at a higher level in the OSF epithelium than in the normal oral mucosal epithelium and was upregulated in the OSF epithelium with aggravation of the OSF lesions. Abnormal FLG expression may be related to the terminal differentiation disorder of OSF epithelial keratinocytes.