溃疡性结肠炎患者结肠黏膜中Smad3和Smad7表达的研究

目的 探讨Smad3和Smad7在溃疡性结肠炎(UC)中的表达及其与临床病理因素的关系.方法 应用免疫组化SABC法检测60例UC患者的结肠黏膜及16例正常结肠黏膜(对照组)中Smad3和Smad7的表达.回顾性分析Smad3和Smad7的表达与UC临床分期、病变范围和病理组织学分级的关系.结果 Smad3在活动期和缓解期UC中的表达显著低于对照组(P值均＜0.05);其与病变范围无相关性(r_s=-0.192,P=0.141),但与病理组织学分级呈负相关(r_s=-0.283.P=0.029).Smad7在活动期和缓解期UC中的表达显著增强(P值均＜0.05),且活动期显著高于缓解期(Z=2.097,P=0.036);其与病变范围无关(r_s=0.066,P=0.614),但与病理组织学分级呈正相关(r_s=0.453.P=0.000).相关分析结果提示,Smad3和Smad7在UC中的表达水平间呈负相关(r_s=0.420,P=0.001).结论 转化生长因子-β1/Smad蛋白的异常表达与UC的发病机制密切相关,Smad7有可能成为反映UC疾病活动度的生物学指标.

Expressions of Smad3 and Smad7 in colonic mucosa of patients with ulcerative colitis

Objective To investigate the expressions of Smad3 and Smad7 in patients with ulcerative colitis(UC)and their relation with clinicopathology.Methods The expressions of Smad3 and Smad7 were measured by immunohistochemistry with SABC method in 60 UC specimens and 16 normal colonic tissues.The association of expressions of Smad3 and Smad7 proteins with clinical staging,lesion extent and pathologic grading were retrospectively analyzed.Results The expression of Smad3 was significantly lower in UC patients than in normal controls(P＜0.05),however,there was no relation between Smad3 expression and lesion extent(P＞0.05).There was a negative correlation between the expression of Smad3 and histological grade(r=-0.283,P＜0.05).The expression of Smad7 was significantly higher in UC patients than in normal controls,and its expression in active disease was higher than that in clinical remission(Z=2.097,P=0.036).There was a positive correlation between the expression of Smad7 and histological grade(r_s=0.453,P=0.000),and no relation between Smad7 expression and lesion extent(r_s=0.066,P=0.614).The statistical analysis showed a negative correlation between Smad3 expression and Smad7 expression(r=-0.420,P＜0.05).Conclusion The abnormal expressions of Smad3 and Smad7 are correlated with pathogenesis of UC.Furthermore.Smad7 may serve as marker for disease activity of UC.