神经激肽-1受体在溃疡性结肠炎黏膜中的表达

Expression of neurokinin-1 receptor in colonic mucosa of patients with ulcerative colitis

目的 了解神经激肽 1受体 (NK 1R)在溃疡性结肠炎 (UC)病人结肠活检黏膜中的表达 ,探讨该受体的表达与UC严重程度的关系。方法 38个UC黏膜标本取自因该病而行结肠镜检查的病人 ,男 2 3例 ,女 15例 ;对照组结肠黏膜取自 15例肠易激综合征 (IBS)病人 ,男 8例 ,女 7例。应用逆转录聚合酶链反应 (RT PCR)检测对照组和UC肠黏膜NK 1R的mRNA表达水平 ,应用Westernblot技术检测NK 1R的蛋白水平 ,以免疫组化方法进行NK 1R的组织学定位。结果 与对照组肠黏膜相比 ,UC黏膜中NK 1RmRNA和蛋白都过度表达 ,NK 1RmRNA的表达与疾病的严重程度相关。免疫组化检查显示 ,NK 1R的表达主要位于UC的肠黏膜表面、黏膜固有层的单核细胞、黏膜下层的动静脉等处。结论 UC黏膜组织中NK 1R的表达水平明显上调 ,扰乱了神经激肽的作用环节 ,加剧了肠黏膜的病理改变。

Objective To investigate the expression of neurokinin 1 receptor (NK 1R) in the biopsy specimens of colonic mucosa in patients with ulcerative colitis (UC). The relation between the expression of NK 1R and clinical severity of UC was also evaluated. Methods UC tissues were obtained from 38 patients (23 males and 15 females) undergoing colonoscopy. Normal human colon tissues were obtained from 15 irritable bowel syndrome (IBS) patients (8 males and 7 females). Reverse transcription polymerase chain reaction (RT PCR), western blot and immunohistochemistry were used to determine the expression of NK 1R. Results NK 1R mRNA expression level was enhanced in mucosae of UC compared with that of IBS. The overexpression of NK 1R was related to the severity of UC. Western blot analysis revealed that the overexpression of NK 1R protein level existed in UC. Immunohistochemistry showed moderate to strong NK 1R immunoreactivity which was localized in mononuclear cells and lymphoid follicles of lamina propria and in the crypt surface, epithelium, lymphoid follicles, submucosal arterioles and myenteric plexus neurones in the colonic mucosa of UC. Conclusions In patients with UC, the overexpression of NK 1R may be involved in the pathophysiological change in the disease and may contribute to the disruption of neuropeptide loop balance and deterioration of clinical condition.