天麻素通过CCR5/JAK1/STAT1信号通路抑制缺血缺氧新生小鼠小胶质细胞介导的炎症反应

Gastrodin inhibits microglia-mediated inflammatory response in ischemic hypoxic neonatal mice via CCR5/JAK1/STAT1 signaling pathway

目的:探究天麻素(GAS)通过C-C趋化因子受体5(CCR5)对新生小鼠缺血缺氧性脑损伤(HIBD)后小胶质细胞JAK1/STAT1信号通路及其介导的炎症反应的影响。方法:选择新出生10 d的C57BL/6J小鼠48只,随机分为假手术(sham)组、HIBD模型组和HIBD与GAS联合处理(HIBD+GAS)组;体外培养BV-2小胶质细胞,分为对照(Con)组、氧糖剥夺(OGD)组、OGD+GAS组、GAS组、Maraviroc(MVC)组、OGD+MVC组和OGD+MVC+GAS组。通过RT-qPCR检测CCL4和CCR5的mRNA表达变化,Western blot检测CCR5、p-JAK1、p-STAT1、肿瘤坏死因子α(TNF-α)和白细胞介素1β(IL-1β)蛋白的表达变化,免疫荧光双标染色检测CCR5、p-JAK1和p-STAT1的表达变化。结果:(1)与sham组相比,HIBD组小鼠缺血侧胼胝体区CCL4和CCR5的mRNA水平,以及CCR5、p-JAK1和p-STAT1的蛋白水平明显增高(P<0.05),而HIBD+GAS组中CCL4和CCR5 mRNA水平,以及CCR5、p-JAK1和p-STAT1的蛋白水平显著低于HIBD组(P<0.05)。(2)与Con组相比,OGD组BV-2细胞中CCR5、p-JAK1和p-STAT1蛋白水平明显增高(P<0.05),而OGD+GAS组BV-2细胞中CCR5、p-JAK1和p-STAT1蛋白水平显著低于OGD组(P<0.05)。(3)CCR5拮抗剂MVC在0~80μmol/L范围内不会导致显著的BV-2细胞死亡。与OGD组相比,MVC+OGD组p-JAK1、p-STAT1、TNF-α和IL-1β蛋白水平显著降低(P<0.05),而MVC+OGD组与OGD+MVC+GAS组无明显差异。结论:GAS可通过靶向CCR5抑制小胶质细胞p-JAK1/p-STAT1通路及相关炎症因子的表达,发挥神经保护作用。

AIM:To investigate the effect of gastrodin(GAS)on microglia-mediated inflammatory response after hypoxic-ischemic brain damage(HIBD)neonatal mice by regulating the expression of JAK1/STAT1 pathway through C-C chemokine recepeor 5(CCR5).METHODS:Forty-eight C57BL/6J mice at about 10 days after birth were randomly divided into sham group,HIBD model group and HIBD+GAS group.BV-2 microglia were divided into control(Con)group,oxygen glucose deprivation(OGD)group,oxygen glucose deprivation with gastrodin intervention(OGD+GAS)group,GAS group,Maraviroc(MVC)group,OGD+MVC group,and OGD+MVC+GAS group.The mRNA expression of CCL4 and CCR5 were detected by RT-qPCR.The protein expression of CCR5,p-JAK1,p-STAT1,tumor necrosis factor-α(TNF-α)and interleukin-1β(IL-1β)were detected by Western blot.The expression of CCR5,p-JAK1 and p-STAT1 in cells were observed by immunofluorescence staining.RESULTS:(1)Compared with sham group,the expression levels of CCL4 and CCR5 mRNA,and CCR5,p-JAK1 and p-STAT1 proteins were significantly higher in the ischemic side of the corpus callosum in HIBD group(P<0.05).(2)Compared with Con group,the protein levels of CCR5,p-JAK1 and p-STAT1 significantly increased in BV-2 cells of OGD group(P<0.05).The protein levels of CCR5,p-JAK1 and p-STAT1 in BV-2 cells of OGD+GAS group were significantly lower than those of OGD group(P<0.05).(3)Maraviroc did not cause significant BV-2 cell death in the 0~80μmol/L range.The p-JAK1 and p-STAT1 protein levels in MVC+OGD group were significantly lowered compared with OGD group(P<0.05),but no significant difference was found between MVC+OGD and OGD+MVC+GAS groups.CONCLUSION:Gastrodin can exert neuroprotective effects via CCR5/JAK1/STAT1 signaling pathway.