Urological Research

, Volume 40, Issue 6, pp 623–637 | Cite as

Biomolecular mechanism of urinary stone formation involving osteopontin

  • Kenjiro Kohri
  • Takahiro Yasui
  • Atsushi Okada
  • Masahito Hirose
  • Shuzo Hamamoto
  • Yasuhiro Fujii
  • Kazuhiro Niimi
  • Kazumi  Taguchi
Invited Review


Urinary stones consist of two phases—an inorganic (mineral) phase and an organic (matrix) phase. Studies on the organic components of kidney stones have been undertaken later than those on the inorganic components. After osteopontin was identified as one of the matrix components, the biomolecular mechanism of urinary stone formation became clearer. It also triggered the development of new preventive treatments. Osteopontin expression is sporadically observed in normal distal tubular cells and is markedly increased in stone-forming kidneys. Calcium oxalate crystals adhering to renal tubular cells are incorporated into cells by the involvement of osteopontin. Stimulation of crystal–cell adhesion impairs the opening of mitochondrial permeability transition pores (mPTP) in tubular cells and produces oxidative stress, apoptosis, and osteopontin expression. Macrophages phagocytose and digest a small amount of crystals, but many crystals aggregate into a mass containing osteopontin and epithelial cell debris and are excreted into the renal tubular lumen, becoming nuclei of urinary stones. This biomolecular mechanism is similar to atherosclerotic calcification. Based on these findings, new preventive treatments have been developed. Dietary control such as low-cholesterol intake and the ingestion of antioxidative foods and vegetables have successfully reduced the 5-year recurrence rate. Osteopontin antibodies and cyclosporine A, which blocks the opening of mPTP, have markedly inhibited the expression of osteopontin and urinary stone formation in animal models.


Osteopontin Urinary stone Calcium oxalate Macrophage Atherosclerosis Mitochondria 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Kenjiro Kohri
    • 1
  • Takahiro Yasui
    • 1
  • Atsushi Okada
    • 1
  • Masahito Hirose
    • 1
  • Shuzo Hamamoto
    • 1
  • Yasuhiro Fujii
    • 1
  • Kazuhiro Niimi
    • 1
  • Kazumi  Taguchi
    • 1
  1. 1.Department of Nephro-urologyNagoya City University Graduate School of Medical SciencesNagoyaJapan

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