共刺激分子B7-H1及其受体PD-1在慢性鼻-鼻窦炎鼻窦黏膜中的表达

目的 观察共刺激分子B7-H1及其受体PD-1在慢性鼻-鼻窦炎患者鼻窦黏膜的表达及分布,探讨其与慢性鼻-鼻窦炎的关系.方法 取慢性鼻-鼻窦炎患者鼻窦病变黏膜28例(11例不伴鼻息肉,17例伴有鼻息肉),另以11例正常鼻窦黏膜作为对照,采用实时荧光定量PCR和Western印迹方法分别检测共刺激分子B7-H1及其受体PD-1 mRNA和蛋白的表达;用免疫荧光技术观察其表达和分布;并用流式细胞术检测鼻息肉组织中阳性细胞的类型.结果 慢性鼻-鼻窦炎两组患者鼻窦黏膜B7-H1/PD-1 mRNA表达水平高于正常鼻窦黏膜(P<0.01),两组患者之间差异无统计学意义(P>0.05);其蛋白的表达水平与mRNA表达水平基本一致.B7-H1主要表达于患者的鼻窦黏膜上皮细胞、黏膜上皮下的炎性细胞和部分黏膜下腺体上皮细胞;PD-1主要表达于黏膜上皮下的炎性细胞.流式细胞术的结果证实鼻息肉组织中部分B7-H1与PD-1的阳性细胞分别是B细胞与T细胞.结论 共刺激分子B7-H1/PD-1在慢性鼻-鼻窦炎的鼻窦黏膜中表达增加,可能在慢性鼻-鼻窦炎的发病机制中起重要作用.

Expression of B7-H1/PD-1 in mucosa of chronic rhinosinusitis

Objective To explore the expression of B7-H1/PD-1 and the localization of these proteins in human sinus mucosa of chronic rhinosinusitis (CRS). Methods Twenty-eight patients with CRS (17 with nasal polyps (CRSwNP) and 11 without (CRSsNP) ) and 11 control patients were recruited. B7-H1/PD-1 expressions in sinus mucosa among these 3 groups were detected by immunofluorescent staining, real-time quantitative PCR and Western blot. Flow cytometry was also employed to identify the type of B7-H1 or PD-1 positive cells in nasal polyps. Results Compared with normal mucosa, B7-H1/PD-1 mRNA was highly expressed in sinonasal mucosa of CRSwNP and CRSsNP ( P<0.01). There was no difference between CRSwNP and CRSsNP (P>0.05). The protein level of B7-H1/PD-1 was similar to mRNA level. As indicated by immunofluorescent assay, B7-H1 was mainly expressed in sinonasal epithelial cells, submucosal gland cells and inflammatory cells within the subepithelial layer while PD-1 was expressed in inflammatory cells within the subepithelial layer. The B7-H1 or PD-1 positive cells in nasal polyps were partially CDI9~+ B cells and CD3~+ T cells respectively. Conclusion B7-H1/PD-1 is up-regulated in sinus mucosa of CRS. B7-H1/PD-1 may play an important role in the pathogenesis of CRS.