Plasma membrane LAT activation precedes vesicular recruitment defining two phases of early T-cell activation

Lakshmi Balagopalan (), Jason Yi, Tiffany Nguyen, Katherine M. McIntire, Adam S. Harned, Kedar Narayan and Lawrence E. Samelson ()
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Lakshmi Balagopalan: National Institutes of Health
Jason Yi: National Institutes of Health
Tiffany Nguyen: National Institutes of Health
Katherine M. McIntire: National Institutes of Health
Adam S. Harned: National Institutes of Health
Kedar Narayan: National Institutes of Health
Lawrence E. Samelson: National Institutes of Health

Nature Communications, 2018, vol. 9, issue 1, 1-17

Abstract: Abstract The relative importance of plasma membrane-localized LAT versus vesicular LAT for microcluster formation and T-cell receptor (TCR) activation is unclear. Here, we show the sequence of events in LAT microcluster formation and vesicle delivery, using lattice light sheet microscopy to image a T cell from the earliest point of activation. A kinetic lag occurs between LAT microcluster formation and vesicular pool recruitment to the synapse. Correlative 3D light and electron microscopy show an absence of vesicles at microclusters at early times, but an abundance of vesicles as activation proceeds. Using TIRF-SIM to look at the activated T-cell surface with high resolution, we capture directed vesicle movement between microclusters on microtubules. We propose a model in which cell surface LAT is recruited rapidly and phosphorylated at sites of T-cell activation, while the vesicular pool is subsequently recruited and dynamically interacts with microclusters.

Date: 2018
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DOI: 10.1038/s41467-018-04419-x

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