miR-146a调控TLR4/NF-κB通路对脑出血模型大鼠的保护作用及机制研究  

Protective effect and mechanism of TLR4/NF-κB pathway regulated by miR-146a in intracerebral hemorrhage model rats

作　　者：吴俊波 杨杰 肖锋 李金亮 WU Junbo;YANG Jie;XIAO Feng;LI Jinliang(Pingxiang Second People's Hospital,Pingxiang 337000,China;Pingxiang Third People's Hospital,Pingxiang 337099,China)

机构地区：[1]萍乡市第二人民医院,萍乡337000 [2]萍乡市第三人民医院,萍乡337099

出　　处：《中国免疫学杂志》2024年第1期82-85,共4页Chinese Journal of Immunology

基　　金：江西省卫生健康委科技计划项目(202212091)。

摘　　要：目的:探索miR-146a调控TLR4/NF-κB通路对脑出血模型大鼠炎症损伤及神经保护的作用及可能作用机制。方法:选取40只大鼠,随机分为假手术组、模型组、过表达miR-146a腺病毒注射组及阴性病毒注射组,每组10只。Garcia评分评定神经功能;HE染色观察脑组织改变;ELISA检测炎症因子水平;Western blot及RT-PCR检测脑组织TLR4、NF-κB蛋白、基因表达。结果:与模型组相比,过表达miR-146a腺病毒注射组大鼠神经功能评分升高(P<0.05)。模型组大鼠脑组织细胞形态异常,伴有水肿及炎症;过表达miR-146a腺病毒注射组大鼠脑组织细胞形态改善,水肿及炎症减轻。模型组大鼠炎症因子水平较假手术组升高(P<0.05);过表达miR-146a腺病毒注射组大鼠炎症因子水平较模型组下降(P<0.05)。模型组大鼠TLR4、NF-κB蛋白及mRNA表达较假手术组增加(P<0.05);过表达miR-146a腺病毒注射组大鼠TLR4、NF-κB蛋白及mRNA表达较模型组下降(P<0.05)。结论:miR-146a可改善脑出血模型大鼠神经功能,减轻炎症损伤,可能通过抑制脑组织TLR4/NF-κB信号通路激活降低炎症因子水平实现。Objective:To explore role of miR-146a in regulating TLR4/NF-κB pathway on inflammatory injury and neuropro-tection in intracerebral hemorrhage model rats and its possible mechanism.Methods:A total of 40 rats were selected and randomly divided into sham,model,over-expressing miR-146a adenovirus and negative virus injection groups,with 10 rats in each group.Garcia score was used for neurological function;HE staining was used to observe changes of brain tissues.ELISA was used to detect inflammatory factors levels.TLR4,NF-κB protein and gene expressions in brain tissues were detected by Western blot and RT-PCR.Results:Compared with model group,neural function score of overexpressed miR-146a adenovirus injection group was increased(P<0.05).Model group had abnormal cell morphology,edema and inflammation.Cell morphology,edema and inflammation were alleviated in overexpressed miR-146a adenovirus injection group.Inflammatory factors levels in model group were higher than sham group(P<0.05).Inflammatory factors levels in overexpressed miR-146a adenovirus injection group were lower than model group(P<0.05).TLR4,NF-κB protein and mRNA expressions in model group were increased than sham group(P<0.05).TLR4,NF-κB protein and mRNA expressions in overexpressed miR-146a adenovirus injection group were decreased than model group(P<0.05).Conclusion:miR-146a can improve neural function and reduce inflammatory injury in rats with intracerebral hemorrhage,possibly by inhibiting activation of TLR4/NF-κB signaling pathway and reducing inflammatory factors levels of brain tissues.

关 键 词：MIR-146A TLR4/NF-κB通路 脑出血 保护作用 

分 类 号：R543[医药卫生—心血管疾病]