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Genetic hypercalciuric stone forming rats

D A Bushinsky1

  • 1Department of Medicine, University of Rochester School of Medicine and Dentistry, NY, USA.

Seminars in Nephrology
|September 1, 1996
PubMed
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A new rat model of idiopathic hypercalciuria shows increased intestinal calcium absorption and kidney defects, mirroring human stone formation. This model aids in studying the mechanisms behind excess urine calcium excretion.

Area of Science:

  • Nephrology
  • Endocrinology
  • Mineral Metabolism

Background:

  • Idiopathic hypercalciuria in humans is linked to kidney stone formation.
  • Studying its mechanisms in humans is challenging.
  • A novel rat model was developed to investigate hypercalciuria.

Purpose of the Study:

  • To establish and characterize a rat model for idiopathic hypercalciuria.
  • To elucidate the underlying mechanisms of excessive urine calcium excretion.
  • To compare findings in the rat model with human idiopathic hypercalciuria.

Main Methods:

  • Development of a hypercalciuric rat strain through selective inbreeding over 40 generations.
  • Analysis of calcium absorption, renal tubular resorption, and bone demineralization.

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  • Quantification of vitamin D receptors in the intestine, bone, and kidney.

    • Main Results:

    • The established rat strain exhibits significantly greater urine calcium excretion than controls.
    • All rats in the strain form kidney stones.
    • Increased intestinal calcium absorption, impaired renal tubular resorption, and bone demineralization were observed.
    • Elevated vitamin D receptor numbers in the intestine, bone, and kidney suggest increased sensitivity to 1,25(OH)2D3.

    Conclusions:

    • The developed rat model closely parallels idiopathic hypercalciuria in humans.
    • The model demonstrates a multifactorial basis for hypercalciuria involving intestine, kidney, and bone.
    • Further research is needed to confirm the role of vitamin D receptors in human idiopathic hypercalciuria.