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Signal strength regulates antigen-mediated T-cell deceleration by distinct mechanisms to promote local exploration or arrest

Abstract : T lymphocytes are highly motile cells that decelerate upon antigen recognition. These cells can either completely stop or maintain a low level of motility, forming contacts referred to as synapses or kinapses, respectively. Whether similar or distinct molecular mechanisms regulate T-cell deceleration during synapses or kinapses is unclear. Here, we used microfabricated channels and intravital imaging to observe and manipulate T-cell kinapses and synapses. We report that high-affinity antigen induced a pronounced deceleration selectively dependent on Ca 2+ signals and actin-related protein 2/3 complex (Arp2/3) activity. In contrast, low-affinity antigens induced a switch of migration mode that promotes T-cell exploratory behavior, characterized by partial deceleration and frequent direction changes. This switch depended on T-cell receptor binding but was largely independent of downstream signaling. We propose that distinct mechanisms of T-cell deceleration can be triggered during antigenic recognition to favor local exploration and signal integration upon suboptimal stimulus and complete arrest on the best antigen-presenting cells.
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Submitted on : Friday, December 4, 2015 - 1:02:32 PM
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Hélène D. Moreau, Fabrice Lemaître, Kym R Garrod, Zacarias Garcia, Ana-Maria Lennon-Duménil, et al.. Signal strength regulates antigen-mediated T-cell deceleration by distinct mechanisms to promote local exploration or arrest. Proceedings of the National Academy of Sciences of the United States of America, National Academy of Sciences, 2015, 112 (39), pp.12151-6. ⟨10.1073/pnas.1506654112⟩. ⟨pasteur-01238129⟩

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