Ferrostatin-1 Inhibits Toll-Like Receptor 4/NF-κB Signaling to Alleviate Intervertebral Disc Degeneration in Rats.

Ferrostatin-1 (Fer-1), an inhibitor of ferroptosis, is implicated in intervertebral disc degeneration (IDD). The current study explored the role of Fer-1 in IDD via the toll-like receptor 4 (TLR4)/NF-κB signaling pathway. IDD-related gene expression microarray GSE124272 and high-throughput sequencing data set GSE175710 were obtained through the Gene Expression Omnibus database. Differentially expressed genes in IDD were identified, followed by implementation of protein-protein interaction network analysis and receiver operating characteristic curve analysis. The main pathways in IDD were obtained through Gene Ontology and Kyoto Encyclopedia of Genes and Genomes functional analyses, and target genes of Fer-1 were obtained through PubChem and PharmMapper websites. Finally, GPX4, FTH, and TLR4 expression was determined in a IDD rat model. Three key co-expression modules involved in IDD were obtained through Weighted Gene Co-Expression Network Analysis. Thirteen differentially expressed genes were found to be associated with IDD, and eight key genes (TLR4, BCL2A1, CXCL1, IL1R1, NAMPT, SOCS3, XCL1, and IRAK3) were found to affect IDD. These eight key genes had the diagnostic potential for IDD. The NF-κB signaling pathway was shown to play a predominant role in IDD development. Network pharmacologic analysis indicated a role of Fer-1 in suppressing ferroptosis and ameliorating IDD via the TLR4/NF-κB signaling pathway, which was verified by an in vivo animal experiment. The study showed that Fer-1 down-regulates TLR4 to inactivate NF-κB signaling pathway, suppressing ferroptosis and ultimately alleviating IDD in rats.