Identification and validation of voltage‐dependent anion channel 1‐related genes and immune cell infiltration in diabetic nephropathy

Abstract

ABSTRACT Aims/Introduction This study investigated the roles of voltage‐dependent anion channel 1‐related differentially expressed genes (VRDEGs) in diabetic nephropathy (DN). Materials and Methods We downloaded two datasets from patients with DN, namely, GSE30122 and GSE30529, from the Gene Expression Omnibus database. VRDEGs associated with DN were obtained from the intersection of voltage‐dependent anion channel 1‐related genes from the GeneCards database, and differentially expressed genes were screened according to group (DN/healthy) in the two datasets. The enriched pathways of the VRDEGs were analyzed. Hub genes were selected using a protein–protein interaction network, and their predictive value was verified through receiver operating characteristic curve analysis. The CIBERSORTx software examined hub genes and immune cell infiltration associations. The protein expression of hub genes was verified through immunohistochemistry in 16‐week‐old db/db mice for experimentation as a model of type 2 DN. Finally, potential drugs targeting hub genes that inhibit DN development were identified. Results A total of 57 VRDEGs were identified. The two datasets showed high expression of the PI3K, Notch, transforming growth factor‐β, interleukin‐10 and interleukin‐17 pathways in DN. Five hub genes (ITGAM, B2M, LYZ, C3 and CASP1) associated with DN were identified and verified. Immunohistochemistry showed that the five hub genes were highly expressed in db/db mice, compared with db/m mice. The infiltration of immune cells was significantly correlated with the five hub genes. Conclusions Five hub genes were significantly correlated with immune cell infiltration and might be crucial to DN development. This study provides insight into the mechanisms involved in the pathogenesis of DN.

Keywords

• Bioinformatics
• Biomarkers
• Diabetic nephropathy