Visualizing context-dependent calcium signaling in encephalitogenic T cells in vivo by two-photon microscopy

Visualizing context-dependent calcium signaling in encephalitogenic T cells in vivo by two-photon microscopy
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通过双光子显微镜观察体内致脑炎 T 细胞中背景依赖性钙信号传导

DOI:
10.1073/pnas.1701806114
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发表时间:
2017
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
通讯作者:
Kawakami N.
Kawakami N.
中科院分区:
--
文献类型:
--
作者:
Kyratsous N.I;Bauer I.J;Zhang G;Pesic M;Bartholomäus I;Mues M;Fang P;Wörner M;Everts S;Ellwart J.W;Watt J.M;Potter B.V.L;Hohlfeld R;Wekerle H;Kawakami N.

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在实验性自身免疫性脑炎(EAE)中,自身免疫T细胞在返回中枢神经系统之前在外周被激活。在它们的过程中,T细胞会经过一系列不同的细胞环境,在那里它们接收到指示它们入侵目标组织的信号。无论自身抗原存在与否,这些信号都与周围基质细胞相互作用。为了描述一系列信号事件,我们研究了t细胞介导的EAE模型,结合体内双光子显微镜和两种不同的激活报告,基于fret的钙生物传感器Twitch1和荧光NFAT。体外激活的T细胞首先在次级(2°)淋巴组织(如脾脏)中沉淀,在没有自身抗原的情况下,它们与基质细胞建立短暂接触,如零星的短期钙尖刺所示。然后T细胞离开脾脏进入中枢神经系统,在那里它们首先沿着小脑膜血管的管腔表面滚动和爬行,而不显示钙活性。穿过血脑屏障后,T细胞扫描薄脑膜间隙寻找自身抗原呈递细胞(apc)。持续的接触导致持久的钙活性和NFAT易位,这是t细胞完全激活的一种衡量标准。这个过程对抗mhc II类抗体敏感。重要的是,激活T细胞的能力并不是所有薄脑膜吞噬细胞的普遍特性,而是在个体apc之间有所不同。我们的研究结果确定了T细胞活化的不同检查点,控制髓磷脂特异性T细胞入侵和攻击中枢神经系统的能力。这些过程可能是有价值的治疗靶点。
In experimental autoimmune encephalitis (EAE), autoimmune T cells are activated in the periphery before they home to the CNS. On their way, the T cells pass through a series of different cellular milieus where they receive signals that instruct them to invade their target tissues. These signals involve interaction with the surrounding stroma cells, in the presence or absence of autoantigens. To portray the serial signaling events, we studied a T-cell–mediated model of EAE combining in vivo two-photon microscopy with two different activation reporters, the FRET-based calcium biosensor Twitch1 and fluorescent NFAT. In vitro activated T cells first settle in secondary (2°) lymphatic tissues (e.g., the spleen) where, in the absence of autoantigen, they establish transient contacts with stroma cells as indicated by sporadic short-lived calcium spikes. The T cells then exit the spleen for the CNS where they first roll and crawl along the luminal surface of leptomeningeal vessels without showing calcium activity. Having crossed the blood–brain barrier, the T cells scan the leptomeningeal space for autoantigen-presenting cells (APCs). Sustained contacts result in long-lasting calcium activity and NFAT translocation, a measure of full T-cell activation. This process is sensitive to anti-MHC class II antibodies. Importantly, the capacity to activate T cells is not a general property of all leptomeningeal phagocytes, but varies between individual APCs. Our results identify distinct checkpoints of T-cell activation, controlling the capacity of myelin-specific T cells to invade and attack the CNS. These processes may be valuable therapeutic targets.
自身免疫性脑脊髓炎免疫治疗过程中可溶性抗原对外周免疫器官效应T细胞的即时作用
DOI: 10.1073/pnas.0608383104
发表时间: 2007
期刊: Proceedings of the National Academy of Sciences
影响因子: --
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发表时间: 2001-05-01
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DOI: --
发表时间: 2014
期刊: Immunity
影响因子: 32.4
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Vahl JC;Drees C;Heger K;Heink S;Fischer JC;Nedjic J;Ohkura N;Morikawa H;Poeck H;Schallenberg S;RieB D;Hein MY;Buch T;Polic B;Schonle A;Zeiser R;Schmitt-Graff A;Kretschmer K;Klein L;Korn T;Sakaguchi S
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DOI: 10.1016/j.immuni.2007.08.018
发表时间: 2007-10-01
期刊: IMMUNITY
影响因子: 32.4
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DOI: 10.1038/nprot.2013.022
发表时间: 2013-02
期刊: Nature Protocols
影响因子: 14.8
作者:
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