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Cloning and expression of apical membrane water channel of rat kidney collecting tubule

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Abstract

CONCENTRATING urine is mandatory for most mammals to prevent water loss from the body. Concentrated urine is produced in response to vasopressin by the transepithelial recovery of water from the lumen of the kidney collecting tubule through highly water-permeable membranes1,2. In this nephron segment, vaso-pressin regulates water permeability by endo- and exocytosis of water channels from or to the apical membrane3,4. CHIP28 is a water channel in red blood cells and the kidney proximal tubule5, but it is not expressed in the collecting tubule6. Here we report the cloning of the complementary DNA for WCH-CD, a water channel of the apical membrane of the kidney collecting tubule. WCH-CD is 42% identical in amino-acid sequence to CHIP28. WCH-CD transcripts are detected only in the collecting tubule of the kidney. Immunohistochemically, WCH-CD is localized to the apical region of the kidney collecting tubule cells. Expression of WCH-CD in Xenopus oocytes markedly increases osmotic water permeability. The functional expression and the limited localization of WCH-CD to the apical region of the kidney collecting tubule suggest that WCH-CD is the vasopressin-regulated water channel.

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Authors and Affiliations

  1. Second Department of Internal Medicine, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113, Japan

    Kiyohide Fushimi, Shinichi Uchida, Yukio Hirata, Fumiaki Marumo & Sei Sasaki

  2. Department of Biochemistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113, Japan

    Yukichi Harat

Authors
  1. Kiyohide Fushimi
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  2. Shinichi Uchida
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  3. Yukichi Harat
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  4. Yukio Hirata
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  5. Fumiaki Marumo
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  6. Sei Sasaki
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Fushimi, K., Uchida, S., Harat, Y. et al. Cloning and expression of apical membrane water channel of rat kidney collecting tubule. Nature 361, 549–552 (1993). https://doi.org/10.1038/361549a0

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  • DOI: https://doi.org/10.1038/361549a0

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