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Related Experiment Videos

Whole urinary proteins coat calcium oxalate monohydrate crystals to greatly decrease their adhesion to renal cells.

Vivek Kumar1, Gerard Farell, John C Lieske

  • 1Department of Medicine, Division of Nephrology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA.

The Journal of Urology
|June 11, 2003
PubMed
Summary

Urinary macromolecules coat calcium oxalate monohydrate (COM) crystals, preventing their adhesion to kidney cells. This process may protect against kidney stone formation by inhibiting crystal retention.

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Area of Science:

  • Nephrology
  • Biochemistry
  • Cell Biology

Background:

  • Kidney stone formation involves urinary crystal adhesion to renal tubular cells.
  • Understanding the role of urinary macromolecules in this process is crucial.

Purpose of the Study:

  • To clarify the role of urinary macromolecules in calcium oxalate monohydrate (COM) crystal adhesion to renal tubular cells.
  • To investigate how urinary components influence COM crystal binding.

Main Methods:

  • Utilized Madin-Darby canine kidney (MDCK) type I cell monolayers as a model system.
  • Assessed COM crystal binding in the presence of whole urine, ultrafiltrates, and urinary concentrates.
  • Analyzed proteins present on coated crystals.

Main Results:

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  • Whole urine significantly decreased COM crystal adhesion compared to ultrafiltrates.
  • Proteins greater than 10 kDa in urine concentrate reduced crystal adhesion.
  • Four specific proteins (bikunin, osteopontin, prothrombin fragment 1+2, Tamm-Horsfall glycoprotein) were identified on coated crystals.
  • Crystals grown in whole urine exhibited lower cell adhesion than those grown in artificial urine.

Conclusions:

  • Urinary macromolecules effectively coat COM crystals, inhibiting their adhesion to renal tubular cells.
  • This inhibition of crystal retention by macromolecules is a potential protective mechanism against kidney stone development.