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AQP5 is expressed in type-B intercalated cells in the collecting duct system of the rat, mouse and human kidney

机译:AQP5在大鼠,小鼠和人类肾脏的集合管系统中的B型插层细胞中表达

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We screened human kidney-derived multipotent CD133+/CD24+ ARPCs for the possible expression of all 13 aquaporin isoforms cloned in humans. Interestingly, we found that ARPCs expressed both AQP5 mRNA and mature protein. This novel finding prompted us to investigate the presence of AQP5 in situ in kidney. We report here the novel finding that AQP5 is expressed in human, rat and mouse kidney at the apical membrane of type-B intercalated cells. AQP5 is expressed in the renal cortex and completely absent from the medulla. Immunocytochemical analysis using segment-and cell type-specific markers unambiguously indicated that AQP5 is expressed throughout the collecting system at the apical membrane of type-B intercalated cells, where it co-localizes with pendrin. No basolateral AQPs were detected in type-B intercalated cells, suggesting that AQP5 is unlikely to be involved in the net trans-epithelial water reabsorption occurring in the distal tubule. An intriguing hypothesis is that AQP5 may serve an osmosensor for the composition of the fluid coming from the thick ascending limb. Future studies will unravel the physiological role of AQP5 in the kidney.
机译:我们筛选了人类肾脏衍生的多能CD133 + / CD24 + ARPC,以了解克隆到人类中的所有13种水通道蛋白同工型的可能表达。有趣的是,我们发现ARPCs表达了AQP5 mRNA和成熟蛋白。这个新颖的发现促使我们研究肾脏中原位存在AQP5。我们在这里报告了新发现,即AQP5在人,大鼠和小鼠肾脏的B型插入细胞顶膜表达。 AQP5在肾皮质中表达,而在髓质中完全不存在。使用片段和细胞类型特异性标记物进行的免疫细胞化学分析明确表明,AQP5在整个收集系统中在B型插层细胞的顶膜表达,在此处与Pendrin共同定位。在B型插层细胞中未检测到基底外侧AQP,这表明AQP5不太可能参与远端小管中发生的净跨上皮水重吸收。一个有趣的假设是,AQP5可以用作渗透传感器,用于检测来自浓密上升肢体的液体成分。未来的研究将揭示AQP5在肾脏中的生理作用。

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