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Related Experiment Videos

Inhibitory effect of bikunin on calcium oxalate crystallization in vitro and urinary bikunin decrease in renal stone

J Médétognon-Benissan1, S Tardivel, C Hennequin

  • 1Laboratoire du Métabolisme Minéral des Mammifères, EPHE, Physiologie, Faculté de Pharmacie, Châtenay-Malabry, France.

Urological Research
|March 26, 1999
PubMed
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Researchers identified two proteins related to bikunin that strongly inhibit calcium oxalate (CaOx) crystal formation. Urinary bikunin levels were significantly lower in kidney stone formers, suggesting its role in preventing CaOx renal stones.

Area of Science:

  • Nephrology
  • Biochemistry
  • Urology

Background:

  • Calcium oxalate (CaOx) crystals are a primary component of kidney stones.
  • Identifying endogenous inhibitors of CaOx crystallization is crucial for understanding stone formation and developing treatments.

Purpose of the Study:

  • To purify and characterize urinary proteins that inhibit CaOx crystallization.
  • To investigate the role of bikunin in CaOx renal stone formation by measuring its urinary concentration in healthy individuals and stone formers.

Main Methods:

  • Purification of bikunin-related proteins from healthy men's urine using affinity chromatography.
  • In vitro assessment of CaOx crystallization inhibition using two different models.
  • Development of an enzyme-linked immunosorbent assay (ELISA) for urinary bikunin quantification.

Related Experiment Videos

  • Comparison of urinary bikunin levels between healthy subjects and CaOx renal stone formers.

    • Main Results:

    • Two bikunin-related proteins (17 and 24 kDa) were purified and demonstrated strong inhibition of CaOx crystallization in vitro (up to 80% inhibition).
    • Mean urinary bikunin concentration in healthy individuals was 5.01 microg/ml, a level showing significant in vitro inhibitory activity.
    • Urinary bikunin levels were approximately 50% lower in CaOx renal stone formers (2.54 microg/ml) compared to healthy controls (P=0.007).
    • A positive correlation between urinary bikunin and alpha-1 microglobulin was observed in controls but absent in stone formers.

    Conclusions:

    • Bikunin exhibits potent inhibitory effects on calcium oxalate crystallization in vitro.
    • Significantly reduced urinary bikunin concentrations in renal stone formers suggest a probable role in the pathogenesis of CaOx kidney stones.
    • Further research into bikunin's therapeutic potential for preventing kidney stone recurrence is warranted.