Uncompensated polyuria a mouse model of Bartter's syndrome

Nobuyuki Takahashi, Daniel R. Chernavvsky, R. Ariel Gomez, Peter Igarashi, Hillel J. Gitelman, Oliver Smithies

Research output: Contribution to journalArticle

186 Citations (Scopus)

Abstract

We have used homologous recombination to disrupt the mouse gene coding for the NaK2Cl cotransporter (NKCC2) expressed in kidney epithelial cells of the thick ascending limb and macula densa. This gene is one of several that when mutated causes Bartter's syndrome in humans, a syndrome characterized by severe polyuria and electrolyte imbalance. Homozygous NKCC2-/- pups were born in expected numbers and appeared normal. However, by day 1 they showed signs of extracellular volume depletion (hematocrit 51%; wild type 37%). They subsequently failed to thrive. By day 7, they were small and markedly dehydrated and exhibited renal insufficiency, high plasma potassium, metabolic acidosis, hydronephrosis of varying severity, and high plasma renin concentrations. None survived to weaning. Treatment of -/- pups with indomethacin from day 1 prevented growth retardation and 10% treated for 3 weeks survived, although as adults they exhibited severe polyuria (10 ml/day), extreme hydronephrosis, low plasma potassium, high blood pH, hypercalciuria, and proteinuria. Wild-type mice treated with furosemide, an inhibitor of NaK2Cl cotransporters, have a phenotype similar to the indomethacin-rescued -/- adults except that hydronephrosis was mild. The polyuria, hypercalciuria, and proteinuria of the -/- adults and furosemide- treated wild-type mice were unresponsive to inhibitors of the renin angiotensin system, vasopressin, and further indomethacin. Thus absence of NKCC2 in the mouse causes polyuria that is not compensated elsewhere in the nephron. The NKCC2 mutant animals should be valuable for uncovering new pathophysiologic and therapeutic aspects of genetic disturbances in water and electrolyte recovery by the kidney.

Original languageEnglish (US)
Pages (from-to)5434-5439
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume97
Issue number10
DOIs
StatePublished - May 9 2000

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Bartter Syndrome
Polyuria
Hydronephrosis
Indomethacin
Hypercalciuria
Furosemide
Proteinuria
Electrolytes
Member 1 Solute Carrier Family 12
Potassium
Kidney
Homologous Recombination
Nephrons
Renin-Angiotensin System
Acidosis
Weaning
Vasopressins
Hematocrit
Renin
Genes

Keywords

  • Anti-inflammatory drug
  • Cotransporter
  • Gene targeting
  • Hydronephrosis
  • NaK2C
  • Nonsteroidal

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

Takahashi, N., Chernavvsky, D. R., Gomez, R. A., Igarashi, P., Gitelman, H. J., & Smithies, O. (2000). Uncompensated polyuria a mouse model of Bartter's syndrome. Proceedings of the National Academy of Sciences of the United States of America, 97(10), 5434-5439. https://doi.org/10.1073/pnas.090091297

Uncompensated polyuria a mouse model of Bartter's syndrome. / Takahashi, Nobuyuki; Chernavvsky, Daniel R.; Gomez, R. Ariel; Igarashi, Peter; Gitelman, Hillel J.; Smithies, Oliver.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 97, No. 10, 09.05.2000, p. 5434-5439.

Research output: Contribution to journalArticle

Takahashi, N, Chernavvsky, DR, Gomez, RA, Igarashi, P, Gitelman, HJ & Smithies, O 2000, 'Uncompensated polyuria a mouse model of Bartter's syndrome', Proceedings of the National Academy of Sciences of the United States of America, vol. 97, no. 10, pp. 5434-5439. https://doi.org/10.1073/pnas.090091297
Takahashi, Nobuyuki ; Chernavvsky, Daniel R. ; Gomez, R. Ariel ; Igarashi, Peter ; Gitelman, Hillel J. ; Smithies, Oliver. / Uncompensated polyuria a mouse model of Bartter's syndrome. In: Proceedings of the National Academy of Sciences of the United States of America. 2000 ; Vol. 97, No. 10. pp. 5434-5439.
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