Explore the transcription change of brain ischemia and reperfusion injury after deep hypothermic low flow.The data from PRJNA739516 and GSE104036 were obtained for the differentially expressed genes identification, functional enrichment anal., gene set enrichment anal., protein-protein interaction construction and hub gene identification.Oxygen and glucose deprivation model was set to validate the hub gene and explore the detailed brain injury mechanism.Interleukin, immunol. response, NF-κB signaling pathway, G protein-coupled receptor signaling pathway and NLRP inflammatory are functional pathway were enriched in differentially expressed genes anal.Sucnr1, Casr, Cxcr4, C5ar1, Tas2r41, Tas2r60 and Hcar2 were identified and verified in the OGD model.Knocking down GPR91 reduces the inflammatory response after OGD and GPR91 may be involved in the inflammatory pre-reaction through the synergistic activation of NF-κB, NLRP3, and IL-1β resp.Our study found that Interleukin, immunol. response, NF-κB signaling pathway, G protein-coupled receptor signaling pathway and NLRP inflammatory are all associated with brain ischemia and reperfusion injury after deep hypothermic low flow and GPR91 can activate NF-κB/NLRP3 pathway and trigger the release of IL-1β in this progress.