水通道蛋白1在小鼠内淋巴囊的超微结构定位

目的研究水通道蛋白1（aquaporin1，AQP1）在小鼠内淋巴囊表达的精确定位，进一步探讨AQP1在内淋巴囊的作用。方法选取正常昆明小鼠30只，断头分离内耳内淋巴囊，应用冰冻切片免疫荧光染色法研究AQP1在内淋巴囊的组织分布情况，借助免疫电镜观察AQP1在内淋巴囊的超微结构定位。结果AQP1在内淋巴囊上皮下结缔组织层有表达。在纤维细胞胞膜特别是细胞突起的胞膜上可见大量胶体金颗粒标记，而上皮细胞的胞膜未见胶体金颗粒的标记。结论富含AQP1的内淋巴囊上皮下组织可能与内淋巴的吸收及平衡调节密切相关。

Ultrastructural localization of aquaporin 1 in endolymphatic sac of the mouse

OBJECTIVE: To study the ultrastructural localization of aquaporin 1 (AQP1) in the endolymphatic sac (ES) of the mouse inner ear and explore the function of the AQP1 in ES. METHODS: The cellular localization of AQP1 in ES of the mouse inner ear was investigated by immunocytochemistry. The ultrastructural localization of AQP1 in the mouse inner ear was performed by immunogold electron microscopy which is characterized as cryoprotection and high sensitivity. RESULTS: In the ES, strong AQP1 labeling was observed in the sub-epithelial connective tissue. Fibroblasts of sub-epithelial connective tissue of the ES present densely labeling of gold particles. But the epithelial cells of the ES were devoid of labeling. AQP1 was localized on the cell processes of the fibrocytes. CONCLUSIONS: AQP1 in the ES may play an important role in absorbing water and regulate the balance of fluid and ion in the inner ear.