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Tol-like receptor 3 protein expression has been shown to be upregulated during cerebral ische-mia/reperfusion injury in rats. In this study, rat primary cortical neurons were subjected to oxy-gen-glucose deprivation to simulate cerebral ischemia/reperfusion injury. Chemical y synthesized smal interfering RNA (siRNA)-1280,-1724 and-418 specific to tol-like receptor 3 were transfected into oxygen-glucose deprived cortical neurons to suppress the upregulation of tol-like receptor 3 protein expression. Western blotting demonstrated that after transfection with siRNA, tol-like ceptor 3 protein expression reduced, especial y in the tol-like receptor 3-1724 group. These results suggested that siRNA-1724 is an optimal sequence for inhibiting tol-like receptor 3 expression in cortical neurons fol owing oxygen-glucose deprivation.