P53蛋白在正常口腔粘膜和口腔白斑病中的增龄性变化

The Age-related Changes of P53 Protein Expression in Oral Mucosa and Their Effects on Oral Leukoplakia

目的 研究正常口腔粘膜组织中 P5 3蛋白表达的增龄性变化 ,探讨上述变化在老年人口腔癌前损害发生过程中的作用。方法 对不同年龄人的正常口腔粘膜及口腔白斑石蜡标本 ,采用免疫组织化学 SP法检测 P5 3蛋白的表达 ,用半定量法对染色结果进行判定。结果 1随年龄增长 ,正常口腔粘膜组织及口腔白斑病变中 P5 3蛋白表达水平呈上升趋势 ;2老年口腔白斑的 P5 3蛋白表达水平明显高于老年正常口腔粘膜 ( P<0 .0 1)。结论 随年龄增长 ,P5 3蛋白功能可能出现障碍 ,难以有效修复老年人体内累积增多的 DNA损伤 。

Objective To investigate the age-related changes of P53 protein expression in oral mucous membrane and their effects on pathogenesis of the oral precancerous lesions in elderly people. Methods An immunohistochemical technique (SP method) was applied to study the changes of P53 expression in normal oral mucosa and oral leukoplakia(OLK) in different age groups. The staining results were evaluated by semi-quantity method. Results With aging, an elevating tendency of P53 protein level exhibited in the normal oral mucosa and OLK, respectively. The P53 level in the old with OLK was higher than that in the normal oral mucosa of the old (P<0.01). Conclusion With aging, P53 protein may undergo dysfunction, lead to imperfect DNA repair and excessive DNA damage accumulation, and ultimately facilitate malignant transformation of the oral mucosa in the old.