老年SD大鼠前列腺导管内尿路上皮屏障的病理学特点

The pathological characters of urothelial barrier in prostatic ducts of elderly SD rats

目的观察老年雄性SD大鼠前列腺导管内尿路上皮屏障的病理学特点。方法取10只老年雄性SD大鼠,予水合氯醛麻醉后取膀胱、前列腺部尿道及前列腺组织行病理连续切片,完成HE染色镜检和免疫组织化学染色法分别检测组织内细胞角蛋白7(CK7)、细胞角蛋白20(CK20)、尿斑蛋白Ⅲ(UPⅢ)、闭锁小带蛋白-1(ZO-1)及闭锁蛋白(Occludin)的表达情况;各抗体免疫组化结果行平均吸光度(IA)值分析。结果HE染色观察到在膀胱、前列腺部尿道和前列腺导管近端存在尿路上皮伞状细胞。免疫组织化学染色示膀胱、前列腺部尿道及前列腺导管中CK7、UPⅢ、ZO-1及Occludin均呈阳性,CK20呈阴性;CK7和UPⅢ在前列腺导管近端呈阳性,导管腺泡腔底部呈阴性;ZO-1和Occludin在前列腺导管中呈阳性。IOD/Area显示CK7和UPⅢ在膀胱、前列腺部尿道、前列腺导管近端、中段和腺泡腔底部的表达分别为0.16、0.13、0.06、0.05、0.00和0.17、0.16、0.08、0.05、0.00(P<0.05);ZO-1和Occludin在膀胱(0.14和0.13)表达高于其他部位(0.11~0.12和0.09~0.10,P<0.05);ZO-1和Occludin从前列腺导管近端到中段和腺泡腔底部表达无明显差异(0.12~0.11和0.09~0.09,P>0.05);CK20的IA值极低(0.00~0.01,P>0.05)。结论老年雄性SD大鼠前列腺导管内存在部分尿路上皮屏障,随着前列腺导管逐渐延伸至腺泡腔,尿路上皮屏障逐渐消失。该结果为进一步研究前列腺切除术后尿路上皮屏障的修复奠定基础。

Objective To investigate the pathological characters of urothelial barrier in prostatic ducts of elderly male SD rats. Methods Ten elderly male SD rats were anesthetized with chloral hydrate and then took the bladder, prostatic urethra and prostate tissues for serial pathological sections and HE staining. Immunohistochemical method was used to detect the expression of the Cytokeratin 7 (CK7), Cytokeratin 20 (CK20), Uroplakin Ⅲ(UP Ⅲ), Zonula occludens-1 (ZO-1) and Occludin in issues, and to make densitometric analysis (IA) on immunohistochemical results of each antibody. Results HE staining observed that urothelial umbrella cells exist in the bladder, prostatic urethra and proximal prostatic duct. Immunohistochemical method showed the CK7, UPⅢ, ZO-1 and Occludin were positive in bladder, prostatic urethra and prostatic duct, while CK20 was negative. CK7 and UPⅢ were positive in the proximal prostatic duct, and negative in the bottom of the ductal acinar lumen;ZO-1 and Occludin were positive in prostatic duct. The IOD/Area values of CK7 and UP Ⅲ, in bladder, prostatic urethra, proximal prostatic duct, the middle of prostatic duct and bottom of the ductal acinar lumen, were 0.16, 0.13, 0.06, 0.05, 0.00 and 0.17, 0.16, 0.08, 0.05, 0.00(P<0.05,respectively). The expression of ZO-1 and Occludin in bladder (0.14 and 0.13) were higher than those in other tissues (0.11-0.12 and 0.09-0.10, P<0.05);the expression of ZO-1 and Occludin, which in proximal prostatic duct to the middle of prostatic duct and bottom of the ductal acinar lumen, had no significant difference (0.12-0.11 and 0.09-0.09, P>0.05). The IA values of CK20 were extremely low (0.00-0.01, P>0.05). Conclusion Urothelial barriers partially exist in the prostatic ducts of elderly male SD rats, and with the prostatic ducts gradually extending to the bottom of acinar lumen, the urothelial barriers disappear. The results lay a foundation for further study on the repair of urinary epithelial barrier after prostatectomy.