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XB-ART-21555
J Clin Invest 1994 Mar 01;933:1250-6.
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Cloning, characterization, and chromosomal mapping of human aquaporin of collecting duct.

Sasaki S , Fushimi K , Saito H , Saito F , Uchida S , Ishibashi K , Kuwahara M , Ikeuchi T , Inui K , Nakajima K .


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We recently cloned a cDNA of the collecting duct apical membrane water channel of rat kidney, which is important for the formation of concentrated urine (Fushima, K., S. Uchida, Y. Hara, Y. Hirata, F. Marumo, and S. Sasaki. 1993. Nature [Lond.]. 361:549-552). Since urine concentrating ability varies among mammalian species, we examined whether an homologous protein is present in human kidney. By screening a human kidney cDNA library, we isolated a cDNA clone, designated human aquaporin of collecting duct (hAQP-CD), that encodes a 271-amino acid protein with 91% identity to rat AQP-CD. mRNA expression of hAQP-CD was predominant in the kidney medulla compared with the cortex, immunohistochemical staining of hAQP-CD was observed only in the collecting duct cells, and the staining was dominant in the apical domain. Functional expression study in Xenopus oocytes confirmed that hAQP-CD worked as a water channel. Western blot analysis of human kidney medulla indicated that the molecular mass of hAQP-CD is 29 kD, which is the same mass expected from the amino acid sequence. Chromosomal mapping of the hAQP-CD gene assigned its location to chromosome 12q13. These results could be important for future studies of the pathophysiology of human urinary concentration mechanisms in normal and abnormal states.

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Species referenced: Xenopus laevis
Genes referenced: aqp2

References [+] :
Al-Zahid, Effect of antidiuretic hormone on water and solute permeation, and the activation energies for these processes, in mammalian cortical collecting tubules: evidence for parallel ADH-sensitive pathways for water and solute diffusion in luminal plasma membranes. 1977, Pubmed