原发性干燥综合征患者唇腺组织上皮型钙黏附蛋白和β-连环素的表达及超微结构改变

目的 探讨上皮型钙黏附蛋白(E-cad)、β-连环素在原发性干燥综合征(pSS)的发病过程中的作用.方法 应用免疫组织化学法对52例pSS患者和30名健康对照者唇腺组织E-cad、β-连环素检测,电镜观察超微结构的改变.采用Marmwhitney U检验和Spearman相关性分析.结果 ①E-cad在pSS组的表达面积[(2513±1086) μm2],吸光度(0.212±0.041)、累积吸光度(566±297)低于健康对照组(P＜0.01),随淋巴细胞浸润灶数的增加,表达呈递减趋势.②β-连环素在pSS组的表达面积[(12 324±7883)μm2],吸光度(0.113±0.031)、累积吸光度(1666±1361)低于健康对照组(P＜0.01),随淋巴细胞浸润灶数的增加,表达呈递减趋势.③E-cad与β-连环素在pSS组唇腺组织的表达呈正相关(P＜0.01).④超微结构:细胞连接疏松.⑤E-cad、β-连环索在抗SSA/SSB抗体(+)与(-)者表达差异有统计学意义(P＜0.05,P＜0.01).结论 ①E-cad、β-连环素参与了pSS的发病过程.②抗SSMSSB抗体在pSS发病过程中具有一定的作用.

Abstract：

Objective To study the expression of E-cadherin( E-cad), p-catenin(β-cat) in labial salivary glands of patients with primary Sj(o)gren's syndrome (pSS) in order to explore their role in pathogenesis. Methods Biopsies of labial salivary glands were obtained from 52 patients with pSS and 30 healthy controls. The immunohistochemical staining was used to detect the expression of E-cad and β-cat. Anti-SSA and anti-SSB antibodies were measured. Semi-quantitative analysis was performed by image analysis software. Ultra-structural changes was used by electron-microscopic techniques. Results ① The area of expression, optical intensity and the accumulated optical intensity of the E-cad group [(2513±1086) μm2, 0.212±0.041, 566 ±297 ] were lower than normal controls. The expression level was reduced as the increase of lymphocyte infiltration focus. ② The area of expression, the optical density and the accumulated optical density of the β- cat group [(12 324±7883) μm2, 0.113±0.031, 566±297] was lower than those of the control group. The expression level was reduced as the increase of the lymphocyte infiltration focus. ③ The E-cad expression and the p-cat expression was positively correlated in the labial gland of patients with pSS. ④ Howev-er, there was difference in the expression of E -cad and β -cat between patients with positive SSA and negative SSA antibodies. Conclusion In salivary samples, the expression of both E-cad and p-cat in patients with pSS is lower than those of the controls. Anti-SSA/SSB antibodies are important parameters of pSS and they may be involved in the pathogenesis of pSS.