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ID:32839418
大小:2.86 MB
页数:75页
时间:2019-02-16
《stim1stim2调控人外周血单核细胞性树突状细胞fcγrii功能》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、中图分类号:R89;R36;R39硕士学位论文STIM1/STIM2调控人外周血单核细胞性树突状细胞FcγRII功能院(系)、所临床医学院研究生姓名孙志娟学科、专业内科学导师姓名刘毅教授二Ο一二年四月目录1STIM1/STIM2调控人外周血单核细胞性树突状细胞FcγRII的功能„„„„„„„„„„„„„„„„„„11.1中文摘要„„„„„„„„„„„„„„„„„„„„„11.2英文摘要„„„„„„„„„„„„„„„„„„„„„51.3前言„„„„„„„„„„„„„„„„„„„„„„„91.4材料与方法„„„„„„„„„„„„„„„„„„„„131.
2、5结果„„„„„„„„„„„„„„„„„„„„„„„331.6讨论„„„„„„„„„„„„„„„„„„„„„„„461.7结论„„„„„„„„„„„„„„„„„„„„„„„521.8参考文献„„„„„„„„„„„„„„„„„„„„„531.9英汉缩略词对照表„„„„„„„„„„„„„„„„„582致谢„„„„„„„„„„„„„„„„„„„„„„„603FcγR对树突状细胞成熟及效应功能的研究进展(综述)„„„„„„„„„„„„„„„„„„„„„„„„„61STIM1/STIM2调控人外周血单核细胞源性树突状细胞FcγRII功能摘要背景树突状细胞(D
3、Cs)是体内功能最为强大的专职抗原递呈细胞(APCs),直接调节机体免疫应答和免疫耐受之间的平衡。DCs的双向调节功能与其自身发育的不同阶段密切相关,同时DCs的分化成熟又与其表面FcR表达密不可分。我们前期研究发现DCs及其前体细胞表面的激活型和抑制型FcγR参与调控细胞的分化成熟和免疫学功能。FcγR参与DCs分化、成熟以及免疫效应主要由其自身激活型基序(ITAM)和抑制型基序(ITIM)所决定的。基质交感分子-1(STIM1)2+是近年发现的Ca通道调节蛋白,堪称细胞内质网上侦测钙离子含2+量的感应器(sensor),是―填充式Ca涌入理论
4、‖(capacitativecalciuminflux)体系中的重要分子,具有潜在的有效调节DCs免疫功能的作2+2用。基质交感分子-2(STIM2)是调控基础Ca流入的主要分子,在Ca+2+通道应答的后期阶段扮演重要角色。细胞Ca的流动不但参与调节T、B等免疫细胞的功能,同时也是细胞表面免疫受体胞内共有的ITAM和ITIM发挥激活和抑制功能的主要元素。由于FcRs发挥功2+2+能是通过胞内ITAM和ITIM引起Ca的流动实现,而Ca的流动本身可能是影响DCs分化成熟的重要环节。因此,探索STIM1和STIM2在FcRs调控DCs分化成熟中的作
5、用对阐明DCs的免疫调节机制,1发掘DCs调控免疫反应的靶点有重要的科学意义。目的:通过探讨STIM1及STIM2在FcR调控树突状细胞成熟中的作用,阐明STIM1和STIM2在DCs发挥免疫调节中的作用。方法:1.DCs体外培养体系的建立采用密度梯度离心法,分离人外周血单个核细胞(PBMC)利用单核细胞贴壁特性,获取单核细胞。采用重组人白细胞介素-4(rhIL-4)100ng/mL联合重组人粒细胞集落刺激因子(rhGM-CSF)100ng/mL刺激6天收获未成熟DCs(iDCs);第6天加入脂多糖(LPS)1μg/mL刺激24h后收获成熟DCs
6、(mDCs)。采用倒置相差显微镜观察DCs形态学变化,流式细胞仪鉴定DCs表型。2.激活FcR受体对STIM1和STIM2表达的影响流式细胞仪和免疫荧光检测DCs表面激活型受体FcγRIIa和抑制型受体FcγRIIb的表达;Real-timePCR和Western-Bolt检测iDCs和2mDCs中STIM1和STIM2的表达差异;分别采用IV.3和7.3与F(ab’)结合形成免疫复合物,分别交联DCs表面激活型和抑制型FcγR后,使用Real-timePCR和Western-Bolt检测交联3min和30min后,细胞内STIM1和STIM2的
7、表达差异。3.STIM1和STIM2的RNA干扰体系建立及鉴定采用化学法合成siRNA,通过Lipo化学转染法递送siRNA进入DCs,采用Real-timePCR技术检测转染效果,MTT法检测转染24h2后细胞活性。4.调节STIM1和STIM2的表达对DCs成熟的影响采用siRNA技术分别沉默DCs中STIM1和STIM2的表达,流式细胞仪检测DCs表型。结果:1.iDCs高表达抑制型受体FcγRIIb(MFI,1572±114.6),LPS诱DCs成熟后FcγRIIb中度降低(MFI,900±21),激活型受体FcγRIIa表达未见明显变化(
8、MFI,740±51)。2.DCs高表达STIM2,而DCs成熟后STIM1的表达明显增高(P<0.05)。采用siRNA
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