Formin-generated actomyosin arcs propel T cell receptor microcluster movement at the immune synapse.
Formin-generated actomyosin arcs propel T cell receptor microcluster movement at the immune synapse.
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DOI:
10.1083/jcb.201603080
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发表时间:
2016-11-07
期刊:
影响因子:
--
通讯作者:
Hammer JA
中科院分区:
文献类型:
--
作者:
Murugesan S;Hong J;Yi J;Li D;Beach JR;Shao L;Meinhardt J;Madison G;Wu X;Betzig E;Hammer JA
Murugesan et al. report that actomyosin arcs at the T cell synapse are formin-generated structures that directly propel T cell receptor cluster movement. The authors reveal the origin, organization, and functions of a major cytoskeletal network during synapse maturation. Actin assembly and inward flow in the plane of the immunological synapse (IS) drives the centralization of T cell receptor microclusters (TCR MCs) and the integrin leukocyte functional antigen 1 (LFA-1). Using structured-illumination microscopy (SIM), we show that actin arcs populating the medial, lamella-like region of the IS arise from linear actin filaments generated by one or more formins present at the IS distal edge. After traversing the outer, Arp2/3-generated, lamellipodia-like region of the IS, these linear filaments are organized by myosin II into antiparallel concentric arcs. Three-dimensional SIM shows that active LFA-1 often aligns with arcs, whereas TCR MCs commonly reside between arcs, and total internal reflection fluorescence SIM shows TCR MCs being swept inward by arcs. Consistently, disrupting actin arc formation via formin inhibition results in less centralized TCR MCs, missegregated integrin clusters, decreased T–B cell adhesion, and diminished TCR signaling. Together, our results define the origin, organization, and functional significance of a major actomyosin contractile structure at the IS that directly propels TCR MC transport.
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影响因子:
3.4
作者:
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通讯作者:
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DOI:
10.1083/jcb.201406120
发表时间:
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期刊:
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影响因子:
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10.1083/jcb.201406121
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期刊:
The Journal of cell biology
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通讯作者:
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DOI:
10.1083/jcb.201201018
发表时间:
2012-06-11
期刊:
The Journal of cell biology
影响因子:
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作者:
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通讯作者:
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DOI:
10.1073/pnas.0902621106
发表时间:
2009-08-04
影响因子:
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通讯作者:
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