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Global analysis of differentially expressed genes during progression of calcium oxalate nephrolithiasis
Susumu Katsuma1, Satoshi Shiojima, Akira Hirasawa
1Department of Molecular, Cell Pharmacology, National Center for Child Health and Development Research Institute, 3-35-31 Taishido, Setagaya-Ku, Tokyo 154-8567, Japan.
Abstract:
The process of nephrolithiasis development is poorly understood at the molecular level. Here, we constructed a cDNA microarray from a rat kidney normalized cDNA library, and investigated the pattern of gene expression in rat kidneys from a calcium oxalate (CaOx) nephrolithiasis model. One hundred and seventy-three genes were found to be at least 2-fold regulated at one or more time points during progression of nephrolithiasis. RT-PCR and immunohistochemical analyses confirmed differential expression at both transcriptional and translational levels of genes identified by cDNA microarray screening. The differentially regulated genes were grouped into six clusters based on their expression profiles; the magnitude and the temporal patterns of gene expression identified known and novel molecular components involved in inflammation and matrix expansion in the CaOx nephrolithiasis kidney. This microarray study is the first report on gene expression programs underlying the process of nephrolithiasis.
Insights
This study reveals key gene expression changes during calcium oxalate (CaOx) nephrolithiasis development in rats. It identifies 173 regulated genes, offering new molecular insights into kidney stone formation.
Area of Science:
- Nephrology
- Molecular Biology
- Genomics
Background:
- Nephrolithiasis, or kidney stone disease, lacks detailed molecular understanding.
- Calcium oxalate (CaOx) stones are the most common type, but their formation mechanisms are unclear.
Purpose of the Study:
- To investigate gene expression patterns during CaOx nephrolithiasis progression.
- To identify molecular components involved in kidney stone formation.
Main Methods:
- Construction of a rat kidney normalized cDNA library.
- Application of cDNA microarray screening to a rat CaOx nephrolithiasis model.
- Validation of differential gene expression using RT-PCR and immunohistochemistry.
Main Results:
- Identified 173 genes with at least 2-fold regulation during nephrolithiasis progression.
- Confirmed differential gene expression at both transcriptional and translational levels.
- Grouped regulated genes into six clusters, revealing involvement in inflammation and matrix expansion.
Conclusions:
- This study provides the first comprehensive report on gene expression programs in CaOx nephrolithiasis.
- Identified novel and known molecular players contributing to kidney stone formation.
- Findings advance understanding of the molecular basis of nephrolithiasis.