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Updated: Jun 27, 2026
Estimation of Urinary Nanocrystals in Humans using Calcium Fluorophore Labeling and Nanoparticle Tracking Analysis
Published on: February 9, 2021
cDNA macroarray analysis of genes in renal epithelial cells exposed to calcium oxalate crystals
Katsuhito Miyazawa1, Kinue Aihara, Ryosuke Ikeda
1Department of Urogenital Surgery, Kanazawa Medial University, Uchinada, Ishikawa, Japan. miyazawa@kanazawa-med.ac.jp
Abstract:
Kidney stone formation is a complex process, and numerous genes participate in this cascade. The binding and internalization of calcium oxalate monohydrate (COM) crystals, the most common crystal in renal stones by renal epithelial cells may be a critical step leading to kidney stone formation. Exposure to COM crystals alters the expression of various genes, but previous studies on gene expression have generally been limited. To obtain more detailed insight into gene expression, we examined gene expression profiles in renal epithelial cells exposed to COM crystals using cDNA macroarray. NRK-52E cells were exposed to COM crystals for 60 and 120 min. Poly (A)(+) RNA was isolated and converted into (32)P-labeled first-strand cDNA, then the cDNA probe was hybridized to the membrane. Hybridization images were scanned and the signal intensities were quantified. Expression of mRNA of 1,176 genes was analyzed with global sum normalization methods. Exposure to COM crystals altered the expression of some of the genes reported previously. Furthermore, novel genes were also identified. Over 20 genes were found to be regulated at least twofold. We performed a large-scale analysis of gene expression in renal epithelial cells exposed to COM crystals, and identified the genes differentially regulated. cDNA macroarray is a useful tool for evaluating gene expression in urolithiasis research.
Insights
Calcium oxalate monohydrate crystals trigger changes in kidney epithelial cell gene expression. This study identified novel genes involved in kidney stone formation, offering new research avenues.
Area of Science:
- Nephrology
- Molecular Biology
- Urolithiasis Research
Background:
- Kidney stone formation involves complex genetic pathways.
- Calcium oxalate monohydrate (COM) crystal interaction with renal cells is a key step.
- Previous gene expression studies in this area were limited.
Purpose of the Study:
- To investigate gene expression profiles in renal epithelial cells upon exposure to COM crystals.
- To identify novel genes regulated by COM crystal exposure.
- To gain detailed insight into the molecular mechanisms of kidney stone formation.
Main Methods:
- Utilized cDNA macroarray technology to analyze gene expression.
- Exposed NRK-52E renal epithelial cells to COM crystals for 60 and 120 minutes.
- Quantified mRNA expression of 1,176 genes using global sum normalization.
Main Results:
- COM crystal exposure altered the expression of previously identified genes.
- Identified several novel genes differentially regulated by COM crystals.
- Over 20 genes showed at least a twofold change in expression.
Conclusions:
- COM crystal interaction significantly impacts renal epithelial cell gene expression.
- cDNA macroarray is an effective tool for urolithiasis gene expression research.
- This study identified key genes for further investigation into kidney stone pathogenesis.
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