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Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
Published on: February 9, 2021
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Pathomechanisms of nephrolithiasis
1Nephrology Department, General Hospital of Preveza, Preveza, Greece.
Hippokratia
|December 31, 2013
Summary
Kidney stones form through crystal nucleation and growth, driven by urine supersaturation and lack of inhibitors. Cellular processes like adherence and endocytosis trap crystals, while intracellular deconstruction defends against kidney calcium deposition.
Area of Science:
- Nephrology
- Biochemistry
- Cell Biology
Background:
- Lithiasis is a significant factor in chronic kidney disease, contributing to tubulo-interstitial nephritis in 15-30% of end-stage renal insufficiency cases.
- Kidney stone formation involves crystal nucleation from urine solutes and subsequent growth through incorporation.
Purpose of the Study:
- To elucidate the physiochemical and cellular mechanisms underlying kidney stone formation and the body's defense against crystal deposition.
- To investigate the role of urine composition, crystal adherence, and cellular uptake in lithiasis pathogenesis.
Main Methods:
- Analysis of physiochemical factors in urine influencing crystal nucleation and growth (supersaturation, inhibitors, organic substrate).
- Examination of molecular interactions mediating crystal adherence to renal epithelial cells.
- Investigation of cellular responses to crystal uptake, including intracellular deconstruction and inflammatory reactions.
Main Results:
- Urine supersaturation, lack of inhibitors, and organic substrate are key to crystal nucleation and growth.
- Epitaxis facilitates crystal aggregation, while specific urinary molecules affect crystal-epithelial cell adherence.
- Intracellular deconstruction of calcium oxalate monohydrate (COM) crystals releases oxalate ions, triggering inflammatory responses and macrophage recruitment via osteopontin.
Conclusions:
- Crystal adherence and endocytosis promote crystal retention within the nephron.
- Intracellular crystal deconstruction is a crucial defense mechanism against renal calcium deposition.
- Understanding these processes offers insights into preventing and managing kidney stone disease.
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