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Overexpression of Egr2 and Egr4 protects rat brains against ischemic stroke by downregulating JNK signaling pathway. | LitMetric
Objective : The purpose of this study was to investigate the effect of Egr2 and Egr4 upregulation on ischemic stroke recovery of rats.Methods : In this study, Sprague Dawley (SD) rats assigned at random into control, sham and MCAO (middle cerebral artery occlusion) group were treated accordingly to build MCAO models. The neurological severity scores (NSS) test was applied to assess rats' behavior. Triphenyltetrazolium chloride (TTC) staining reflected infarct areas while Nissl staining revealed the number of neurons. Levels of pro-inflammatory cytokines (interleukin [IL]-1β, IL-6 and tumor necrosis factor [TNF]-α) were judged by enzyme-linked immunosorbent assay (ELISA) in brain and serum tissues. We applied western blot to check the expression of Egr2, Egr4 and JNK/c-JUN (c-Jun N-terminal kinase) pathway. Further grouping of rats were based on various transfection, requiring control, sham, MCAO, MCAO + Egr2 cDNA (complementary DNA), MCAO + Egr4 cDNA, MCAO + Egr2 cDNA + Egr4 cDNA group to observe difference in MCAO recovery and JNK/c-JUN-pathway-related protein expression.Results : Under successful modeling of MCAO, western blot results suggested down-regulation of Egr2 and Egr4 and overexpression of pro-inflammatory cytokines. The JNK/c-JUN pathway was activated. On upregulation of Egr2 and Egr4 in infarct areas, neurological function of SD rats recovered along with repressed JNK/c-JUN pathway activation and increased neuron number.Conclusion : Upregulation of Egr2 and Egr4 could demote the activation of JNK/c-JUN pathway and the expression of pro-inflammatory cytokines in MCAO rats, so that Egr2 and Egr4 might be potential targets for ischemic stroke in future.
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