中文摘要
帕金森病(PD)是常见神经系统退行性疾病。小胶质细胞激活导致多巴胺能神经元损伤是PD发生发展的重要机制之一,然而尚未发现针对该机制的有效药物。 研究表明:丁苯酞(NBP)能通过抑制自噬和激活Nrf2/ARE抑制NF-κB通路,从而减轻炎症反应。申请者前期研究发现:NBP能改善PD患者的运动障碍;在脂多糖(LPS)诱导的PD小鼠模型中,NBP能抑制小胶质细胞激活,减少多巴胺能神经元丢失。我们推测这可能与NBP抑制LPS诱导的小胶质细胞NF-κB通路的激活有关。因此,本研究拟通过LPS诱导的细胞和动物PD模型揭示NBP抑制LPS诱导的小胶质细胞NF-κB通路激活的多种机制,证实NBP在PD治疗中的作用及分子机制,为NBP治疗PD提供实验和理论依据。
英文摘要
Parkinson's disease (PD) is a common neurodegenerative disease. Microglia activation triggered injury of dopaminergic neurons is one of the important mechanisms of occurrence and development of PD, however, an effective drug treatment for this pathogenesis has not yet been found. Studies have shown that 3-N-butylphthalide (NBP) can inhibit NF-κB inflammatory response via repressing autophagy and the activation of Nrf2 / ARE. Applicants’ preliminary stage of work have discovered that 3-N-butylphthalide (NBP) can improve the symptoms of dyskinesia in PD patients and also inhibit microglial activation thus reduce the loss of dopaminergic neurons in lipopolysaccharide (LPS) – induced PD mouse model. Therefore, we speculate that NBP can reduce the loss of dopaminergic neurons so as to prevent the development of PD via LPS-induced activation of microglia suppressing NF-κB pathway. This study intends to, through LPS induced in vivo in vitro PD model, reveal that NBP inhibits LPS-induced microglial NF-κB pathway activation in a variety of mechanisms to verify NBP's role in the treatment of PD and molecular mechanism and provide experimental and theoretical basis for curing PD with NBP treatment regiment.
结题摘要
帕金森病(PD)是常见神经系统退行性疾病。小胶质细胞激活导致多巴胺能神经元损伤是PD发生发展的重要机制之一,然而尚未发现针对该机制的有效药物。 研究表明:丁苯酞(NBP)能通过抑制自噬和激活Nrf2/ARE抑制NF-κB通路,减轻炎症反应。申请者前期研究发现:NBP能改善PD患者的运动障碍;在脂多糖(LPS)诱导的PD小鼠模型中,NBP能抑制小胶质细胞激活,减少多巴胺能神经元丢失。本研究通过LPS诱导的PD细胞模型,研究NBP抑制LPS诱导的小胶质细胞NF-κB通路激活的多种机制。结果表明:1. NBP能通过抑制NF-κB通路抑制LPS诱导的小胶质细胞激活,从而减少其对多巴胺神经元死亡的影响:NBP和NF-KB-p65敲降均能抑制LPS诱导小胶质细胞激活:Iba1和TNF-α表达减少;LPS处理后,NF-KB磷酸化及核转移增强,添加NBP组,相比LPS组,NF-KB磷酸化及核转移有所降低;LPS处理后SH-SY5Y细胞增殖减少,凋亡增加,加NBP和NF-KB敲降后细胞增殖升高,凋亡减少。2. NBP能通过抑制小胶质细胞自噬而抑制NF-κB通路激活,从而减少多巴胺神经元死亡:LPS处理后的小胶质细胞自噬增强,Atg5,Atg7,LC3,Beclin1表达增加,LC3Ⅰ/LC3Ⅱ比值降低,LPS和增强自噬均能诱导小胶质细胞NF-κB通路的激活及小胶质细胞活化,p-NF-κBp65/ NF-κBp65比值增加,Iba1和TNF-α表达增加,而NBP能抑制LPS和饥饿导致的自噬,抑制其诱导NF-κB通路的激活及小胶质细胞活化,从而保护SH-SY5Y细胞。3. NBP能通过激活小胶质细胞的Nrf2/ARE通路抑制NF-κB通路激活,从而减少其对多巴胺神经元死亡: NBP预处理后的小胶质细胞Nrf2表达增加,增加的Nrf2抑制NF-κB通路的激活及小胶质细胞活化,p-NF-κBp65/ NF-κBp65比值降低,Iba1和TNF-α表达减少,多巴胺神经细胞凋亡减少,增殖增加。本研究证实了NBP在PD治疗中的作用的可能机制,为下一步研究NBP治疗PD的作用位点及作用方式提供了实验和理论依据。
