蛋白酶激活受体在腹泻型肠易激综合征患者结肠黏膜组织中的表达及意义

The expression of protease-activated receptors in colon mucosa tissue of patients with diarrhea

目的 研究蛋白酶激活受体（PAR）家族在腹泻型肠易激综合征（D-IBS）患者结肠黏膜中的表达变化情况.方法 入选28例D-IBS患者及18名健康对照者,经结肠镜钳取乙状结肠黏膜组织,采用Western印迹法和实时荧光定量PCR法观察蛋白酶激活受体超家族的表达情况.应用SPSS 18.0软件进行统计分析,两组间差异采用Mann-Whitney U检验.结果 PAR1在D-IBS患者和对照组结肠黏膜中的表达差异无统计学意义（P=0.300）.PAR2和PAR4在D-IBS患者的结肠黏膜中均表达增加,其灰度值分别为0.99±0.67和0.37±0.14,显著高于对照组的0.63±0.38和0.25±0.11（P值分别=0.038和0.013）.实时荧光定量PCR显示PAR mRNA的表达与蛋白水平相一致.结论 PAR2、PAR4的表达在D-IBS患者结肠黏膜中明显增高,可能在D-IBS疾病过程中发挥某些作用.

Objective To investigate the expression of protease-activated receptors （PARs） in colon mucosal tissue of patients with diarrhea-predominant irritable bowel syndrome （D-IBS）. Methods Colon mucosa tissues were obtained from 28 D-IBS patients and 18 normal controls by colonoscopy.The expression of PARs was detected using Western blotting and real-time PCR. Data were analysed by SPSS 18. 0 softwave, and comparisons between groups were done using Mann-Whitney U test.Results There was no difference in expression of PAR1 between D-IBS patients and normal controls （P=0. 300）. The expressions of PAR2 and PAR4 were higher in D-IBS patients than those in normal controls （0.99±0.67 vs 0.63±0.38, P=0.038 and 0.37±0. 14 vs 0.25±0. 11, P=0.013,respectively）. The results of real-time PCR were in accordance with those of Western blotting.Conclusion The increased expressions of PAR2 and PAR4 in colon mucosa of D-IBS patients indicate that these two PAR receptors may be involved in the process of D-IBS.