Aquaporin-2 (AQP-2) is found in the apical cell membranes of the kidney's collecting duct principal cells and in intracellular vesicles located throughout the cell. It is encoded by the AQP2 gene.It is the only aquaporin regulated by vasopressin.The basic job of aquaporin 2 is to reabsorb water from the urine while its being removed from the blood by the kidney. Aquaporin 2 is in kidney epithelial cells and usually lies dormant in intracellular vesicle membranes. When it is needed, vasopressin binds to the cell surface vasopressin receptor thereby activating a signaling pathway that causes the aquaporin 2 containing vesicles to fuse with the plasma membrane, so the aquaporin 2 can be used by the cell.
Background References
1. Valenti G, Tamma G. The vasopressin-aquaporin-2 pathway syndromes. Handb Clin Neurol. 2021;181:249-259. doi: 10.1016/B978-0-12-820683-6.00018-X. PMID: 34238461.
2. Olesen ET, Fenton RA. Aquaporin-2 membrane targeting: still a conundrum. Am J Physiol Renal Physiol. 2017 Apr 1;312(4):F744-F747. doi: 10.1152/ajprenal.00010.2017. Epub 2017 Feb 8. PMID: 28179252.
mIHC analysis of mouse kidney tissue (Formalin/PFA-fixed paraffin-embedded sections) with Rabbit anti-Aquaporin 2 antibody (IRS089RB) at 1/100 dilution. The immunostaining was performed with the IRISKitCmTSA Kit (900808). Heat mediated antigen retrieval with Tris-EDTA buffer (pH 9.0) for 30 mins at 95℃. DAPI (blue) was used as a nuclear counter stain. Image acquisition was performed with Olympus VS200 Slide Scanner.
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