内耳免疫应答过程中内淋巴囊的细胞增殖

Cell proliferation in endolymphatic sac during the immune response of inner ear

目的 研究和评价内耳二次免疫应答过程中内淋巴囊的细胞增殖情况。方法 选用SD大鼠 15只 ,以钥孔虫戚血蓝蛋白 (keyholelimpethemocyanin ,KLH)全身免疫后 ,经耳蜗底回钻孔以相同抗原进行内耳免疫 ,然后分别在内耳免疫后 3、7和 14d腹腔注射溴脱氧尿嘧啶核苷(bromodeoxyuridine ,BrdUrd)后处死动物 ,取颞骨经组织学处理制作冰冻切片 ,用免疫组织化学技术观察内淋巴囊的细胞浸润、增殖和IgG细胞的分布状况。结果 内耳受抗原刺激后 3d内淋巴囊囊腔和囊周区域出现单核吞噬细胞浸润 ,7d内淋巴囊的浆细胞和淋巴细胞大量增加 ;3～ 7d内淋巴囊囊腔KLH被吞噬 ,同时S期细胞和IgG阳性细胞逐渐增多 ,二者的出现部位相似。结论 在内耳针对T细胞依赖性抗原的二次应答中 ,内淋巴囊的细胞增殖活性增强 ,且局部增殖的细胞可能在原位分化为免疫活性细胞 ,提示内淋巴囊具有增殖免疫活性细胞的功能 ,在内耳免疫应答过程中发挥重要作用。

Objective To study the cell proliferation in endolymphatic sac(ES) during the secondary immune response in inner ear. Methods Fifteen healthy, female SD rats were employed in the experiment. Sensitized systematically with keyhole limpet hemocyanin (KLH), the animals were inoculated with the same antigen through cochlea basal turn into the labyrinth. Adminstrated 5-bromo-2′-deoxyuridine (BrdUrd) intraperitoneally, the rats were sacrificed and the temporal bones were harvested at 3, 7,14 day after labyrinth vaccination respectively. The frozen sections of the decalcified samples were dealt with H-E staining and immunohistohemical methods to investigate the cellular infiltration, BrdUrd and IgG positive cells in the ES. Results While the ES lumen and perisaccular region were infiltrated with mononeuclear-phagocyte at the 3rd day post-vaccination, plasmocyte and lymphatic cells become the predominant infiltrating cells in the ES at the 7th day. The KLH in the ES lumen were phagocytized at the 3-7th day post-vaccination. S-phase cells and IgG positive cells in ES increased markedly in the 3rd day and 7-14 days post-vaccination respectively with similar localization. Conclusion The activety of cell proliferation in the ES enhance and local proliferated cells may differentiate in situ into immunocomptent cells during the secondary immune response against TD antigen in the inner ear. This indicates that ES plays an important role in immume reponse of inner ear.