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Klotho: a novel phosphaturic substance acting as an autocrine enzyme in the renal proximal tubule

Open access
Hu, Ming Chang, Shi, Mingjun, Zhang, Jianning, Pastor, Johanne, Nakatani, Teruyo, Lanske, Beate, Razzaque, M. Shawkat, Rosenblatt, Kevin P., Baum, Michel G., Kuro‐O, Makoto, Moe, Orson W.·2010·The FASEB Journal

Abstract

Klotho has profound effects on phosphate metabolism, but the mechanisms of how Klotho affects phosphate homeostasis is unknown. We detected Klotho in the proximal tubule cell, brush border, and urinary lumen, where phosphate homeostasis resides. Increasing Klotho in the kidney and urine chronically by transgenic overexpression or acutely by intravenous infusion caused hypophosphatemia, phosphaturia from decreased proximal phosphate reabsorption, and decreased activity and protein of the principal renal phosphate transporter NaPi‐2a. The phosphaturic effect was present in FGF23‐null mice, indicating a direct action distinct from Klotho's known role as a coreceptor for FGF23. Direct inhibition of NaPi‐2a by Klotho was confirmed in cultured cells and in cell‐free membrane vesicles characterized by acute inhibition of transport activity followed by decreased cell surface protein. Transport inhibition can be mimicked by recombinant β‐glucuronidase and is associated with proteolytic degradation and reduced surface NaPi‐2a. The inhibitory effect of Klotho on NaPi‐2a was blocked by β‐glucuronidase inhibitor but not by protease inhibitor. Klotho is a novel phosphaturic substance that acts as an enzyme in the proximal tubule urinary lumen by modifying glycans, which cause decreased transporter activity, followed by proteolytic degradation and possibly internalization of NaPi‐2a from the apical membrane.—Hu, M. C., Shi, M., Zhang, J., Pastor, J., Nakatani, T., Lanske, B., Shawkat Razzaque, M., Rosenblatt, K. P., Baum, M. G., Kuro‐o, M., Moe, O. W. Klotho: a novel phosphaturic substance acting as an autocrine enzyme in the renal proximal tubule. FASEB J . 24, 3438–3450 (2010). www.fasebj.org

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Metadata

Authors
Hu, M. C., Shi, M., Zhang, J., Pastor, J., Nakatani, T., Lanske, B., Razzaque, M. S., Rosenblatt, K. P., Baum, M. G., Kuro‐O, M., & Moe, O. W.
Venue
The FASEB Journal
Publisher
Wiley
Published
2010-05-13
Volume
24
Issue
9
Pages
3438-3450
ISSN
  • 0892-6638 (ISSN-L)
  • 1530-6860
OpenAlex
W2106711282
Cited by
578
References
63
FWCI
32.23
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Klotho: a novel phosphaturic substance acting as an autocrine enzyme in the renal proximal tubule. https://app.cochat.ai/papers/10.1096/fj.10-154765
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Hu, M. C., Shi, M., Zhang, J., Pastor, J., Nakatani, T., Lanske, B., Razzaque, M. S., Rosenblatt, K. P., Baum, M. G., Kuro‐O, M., & Moe, O. W. (2010). Klotho: a novel phosphaturic substance acting as an autocrine enzyme in the renal proximal tubule. The FASEB Journal. https://doi.org/10.1096/fj.10-154765

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