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
复制标题
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
复制
发表时间:
2017
期刊:
影响因子:
--
通讯作者:
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.
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.
登录
查看更多内容
DOI:
10.1073/pnas.0608383104
发表时间:
2007
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
作者:
F. Odoardi;N. Kawakami;Zhaoxia Li;C. Cordiglieri;K. Streyl;M. Nosov;W. Klinkert;J. Ellwart;J. Bauer;H. Lassmann;H. Wekerle;A. Flügel
通讯作者:
A. Flügel
影响因子:
--
作者:
Cepko, C;Pear, W
通讯作者:
Pear, W
影响因子:
32.4
作者:
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
通讯作者:
Sakaguchi S
影响因子:
32.4
作者:
Celli, Susanna;Lemaitre, Fabrice;Bousso, Philippe
通讯作者:
Bousso, Philippe
影响因子:
14.8
作者:
E. Romanelli;C. Sorbara;Ivana Nikić;Athanasios Dagkalis;T. Misgeld;M. Kerschensteiner
通讯作者:
E. Romanelli;C. Sorbara;Ivana Nikić;Athanasios Dagkalis;T. Misgeld;M. Kerschensteiner