Cystic echinococcosis is a zoonosis of global distribution caused by Echinococcus granulosus, and does serious harm to the health of humanbeing. Lack of understanding about host immune response to infection, especially in primary stage, and immunomodulatory mechanism restrict the development of vaccine against cystic echinococcosis. Our preliminary study showed that ES display a key role in E.granulosus escape from host immune response via impairing dendritic cells function.TLR2 is important pattern recognition receptor on DC surface involved in recognition of components of pathogen. This study aims to illustrate the role and mechanism of TLR2 in the regulation of immune responses during the infection with E. granulosus by infection TLR2 knock out and wild type mice with E. granulosus, measuring the parasite burdens, characterization the immune responses, and detection of the relevant cytokines and molecules.In addition to increase knowledge about the regulation of immune responses during E.granulosus infection, especially about negative regulation,the results of this work will provide an newidea and important molecular basis for design and optimization of vaccine against cystic echinococcosis.
细粒棘球绦虫感染引起的包虫病是一种严重的人兽共患寄生虫病。对细粒棘球绦虫感染早期的免疫应答及其调节机制缺乏认识是制约其预防和治疗研究的重要瓶颈。我们前期研究发现,细粒棘球绦虫排泄分泌抗原可抑制树突状细胞活化,下调宿主免疫应答,但具体机制尚未明确。TLR2是树突状细胞表面识别病原相关分子的重要模式识别受体。本课题拟采用TLR2基因敲除小鼠建立细粒棘球绦虫感染模型,以野生型小鼠为对照,观察感染结果、细胞免疫及体液免疫特征,检测相关信号分子的表达情况,揭示TLR2在细粒棘球绦虫感染中的作用及其机制。本研究将为深入探讨细粒棘球绦虫负向调控宿主免疫应答的租用机制提供基础,为包虫病疫苗及药物研究提供分子基础和新的思路。
细粒棘球绦虫感染引起的包虫病是一种严重的人兽共患寄生虫病,对细粒棘球绦虫感染早期的免疫应答及其调节机制缺乏认识是制约其预防和治疗研究的重要瓶颈。前期研究发现细粒棘球绦虫排泄分泌抗原能下调宿主免疫应答,但具体机制尚未明确。TLR2是树突状细胞表面识别病原相关分子模式的重要模式识别受体,在本课题研究中,我们用TLR2基因敲除小鼠建立了动物感染模型,检测其细胞亚群和细胞因子的变化。结果显示TLR2具有负向免疫调节作用,可通过诱导调节性淋巴细胞下调宿主免疫应答。同时,还对lncRNA和miRNA的免疫调节作用进行了探索,结果显示lncRNA参与多个信号通路,可与转录因子联合调控靶基因的转录,影响髓源抑制性细胞的免疫调节功能,而多房棘球绦虫的miRNA可抑制NO产生,干扰LPS/TLR4信号通路,与致病性有关。此外还对细粒棘球蚴囊育囊与不育囊囊液进行了蛋白质组分析,鉴定出一系列与虫体生长发育等相关蛋白分子。这些结果将为深入探讨细粒棘球绦虫负向调控宿主免疫应答的机制提供基础,为包虫病疫苗及药物研究提供分子基础和新的思路。
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数据更新时间:2023-05-31
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