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A Semi-Automated and Reproducible Biological-Based Method to Quantify Calcium Deposition In Vitro
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Tubular and interstitial nephrocalcinosis.

Maxime T M Kummeling1, Bas W D de Jong, Charlie Laffeber

  • 1Department of Urology, Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands.

The Journal of Urology
|July 24, 2007
PubMed
Summary

Nephrocalcinosis, characterized by calcium deposits in the kidney, has two forms: tubular and interstitial. Tissue processing can lead to underestimation of tubular nephrocalcinosis, particularly calcium oxalate crystal deposition.

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Area of Science:

  • Nephrology
  • Renal Pathology
  • Mineral Metabolism

Background:

  • Nephrocalcinosis is a condition involving calcium deposition in the kidneys.
  • The prevalence and detection methods for nephrocalcinosis require further investigation.
  • Understanding crystal deposition is crucial for diagnosing and managing renal conditions.

Purpose of the Study:

  • To determine the commonality of nephrocalcinosis in renal tissue.
  • To assess the impact of tissue processing on the detection of nephrocalcinosis.
  • To differentiate between forms of nephrocalcinosis and their associated factors.

Main Methods:

  • Analysis of renal cortical and papillary tissue from 15 oncologically indicated nephrectomies.
  • Comparison of immediately frozen versus formaldehyde-fixed sections for crystal detection.
  • Utilized polarized light microscopy, Raman spectroscopy, and specific stains (Yasue for calcium, hyaluronan staining).

Main Results:

  • Birefringent particles, indicative of crystals, were found in 13/15 snap-frozen tumor kidney sections.
  • Interstitial nephrocalcinosis was identified in 20% of tumor kidneys, localized to the papillary interstitium and associated with hyaluronan.
  • Formaldehyde fixation significantly reduced the detection of tubular calcium oxalate monohydrate crystals compared to frozen sections.

Conclusions:

  • Two distinct forms of nephrocalcinosis exist: tubular and interstitial.
  • Tubular nephrocalcinosis, particularly calcium oxalate type, may be underestimated due to crystal loss during routine histological processing.
  • Hyaluronan may play a role in the pathogenesis of both forms of nephrocalcinosis.