Characterizing Chemokine Signaling Pathways and Hub Genes in Calcium Oxalate-Induced Kidney Stone Formation: Insights...

Area of Science:

• Nephrology
• Molecular Biology
• Bioinformatics

Background:

• Calcium oxalate monohydrate (COM) is the primary component of kidney stones.
• Rodent models are used for calcium oxalate (CaOx) crystallization, but Randall's plaques (RPs) require further study.
• Understanding cellular responses to CaOx is crucial for kidney stone disease research.

Purpose of the Study:

• To identify key genes and pathways involved in the renal response to calcium oxalate (CaOx) crystal stimulation.
• To investigate the role of chemokines in the pathogenesis of kidney stone disease.
• To validate bioinformatics findings using experimental methods.

Main Methods:

• Analysis of Gene Expression Omnibus (GEO) datasets (GSE89028, GSE75542) to identify common differentially expressed genes (co-DEGs).
• Gene Ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis, and Gene Set Enrichment Analysis (GSEA).
• Protein-protein interaction (PPI) network construction and hub gene identification using Cytohubba.
• Validation using quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot on HK-2 cells.

Main Results:

• Identified 28 co-DEGs between two GEO datasets.
• Enrichment analyses revealed significant involvement of chemokine-related signaling pathways.
• Three hub genes (CCL2, CXCL1, CXCL2) were identified as key players.
• CaOx treatment significantly upregulated CCL2, CXCL1, and CXCL2 in renal tubular epithelial cells (HK-2).
• Chemokine release was associated with TNF and IL-17 signaling pathway activation.

Conclusions:

• Renal tubular epithelial cells release chemokines (CCL2, CXCL1, CXCL2) upon CaOx stimulation.
• These chemokines activate critical signaling pathways, suggesting a role in kidney stone formation.
• Findings provide novel directions for therapeutic strategies targeting kidney stone disease.