Abstract
During trafficking through tissues, T cells fine-tune their motility to balance the extent and duration of cell-surface contacts versus the need to traverse an entire organ. Here we show that in vivo, myosin IIA–deficient T cells had a triad of defects, including overadherence to high-endothelial venules, less interstitial migration and inefficient completion of recirculation through lymph nodes. Spatiotemporal analysis of three-dimensional motility in microchannels showed that the degree of confinement and myosin IIA function, rather than integrin adhesion (as proposed by the haptokinetic model), optimized motility rate. This motility occurred via a myosin IIA–dependent rapid 'walking' mode with multiple small and simultaneous adhesions to the substrate, which prevented spurious and prolonged adhesions. Adhesion discrimination provided by myosin IIA is thus necessary for the optimization of motility through complex tissues.
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Acknowledgements
We thank P. Beemiller for help with two-photon data analysis with Imaris and Matlab software; S. Peck for assistance in maintenance of microscopes; M. Tang (Stanford Microfabrication Center) for Silicon Masters; S. Jiang for technical assistance with cell sorting; O. Khan and M. Werner for help with mouse genotyping; M. Heuze for assistance in setting up the microchannel system; and B. Sauer (Stowers Institute for Medical Research) for the pBS479 vector. Supported by the National Institutes of Health (AI52116 to M.F.K.) and the Larry L. Hillblom Foundation (R.S.F.).
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J.J. designed, did and analyzed all experiments and wrote the manuscript; R.S.F. provided assistance with in vivo experiments and participated in two-photon experiments; M.A.C. and R.S.A. generated the Myh9flox/flox mice and provided reagents; A.-M.L-D. and M.P. provided assistance in establishing the microchannel fabrication technique; C.M.S. helped with tissue sectioning and staining and with mouse genotyping; and M.F.K. coordinated the project and participated in the conception and execution of experiments and in writing the manuscript.
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Supplementary Text and Figures
Supplementary Figures 1–4 (PDF 5480 kb)
Supplementary Video 1
Naïve MyoIIA-deficient T cells have reduced intra-lymph node migration. Representative movie of interstitial migration in vivo of control T cells (green) and MyoIIA cKO T cells (red). Naïve CD8+ T cells were purified by negative selection from control and MyoIIA cKO mice, then labeled with either CFSE or CMTMR, mixed at a 1:1 ratio and injected intravenously into recipient mice. Popliteal, axillary and inguinal lymph nodes were isolated 18h after transfer and imaged by time-lapse 2-photon laser scanning microscopy. The duration of the timelapse is 30 min at 20 sec intervals between frames. The tracks were obtained using Imaris software and the latest trailing 20 frames are shown. The grid spacing is at 20 μm. (MOV 1254 kb)
Supplementary Video 2
Representative behavior of T cells in 4, 8 and 20 μm wide microchannels. CD8+ T cells 4-5 days post-activation were injected into fabricated microchannels allowed to enter the channels for 2h and then imaged. Timelapse imaging was done using a 20X objective at a 30 sec intervals for 2h. Representative T cells crawling within microchannels of different width are shown to highlight the different average speeds of T cells as a function of confinement. (MOV 2951 kb)
Supplementary Video 3
Representative 'weaving' behavior of a control T cell in a 20 μm wide microchannel. CD8+ T cells 4-5 days post-activation were injected into fabricated microchannels in the presence of vehicle control and then imaged. Imaging was done using a 10X Phase contrast objective at 1.5 min intervals for a minimum of 2h. A representative control T cell is shown rapidly 'weaving' between the two side walls of the microchannel. (MOV 911 kb)
Supplementary Video 4
Blebbistatin treated T cells show increased adhesion and reduced 'weaving' behavior in 20 μm wide microchannels. CD8+ T cells 4-5 days post-activation were injected into fabricated microchannels in the presence of 100 μm blebbistatin (racemic mix) and then imaged. Imaging was done using a 10X Phase contrast objective at 1.5 min intervals for a minimum of 2h. A representative blebbistatin treated T cell is shown displaying increased dwell-time adhering to walls and reduced 'weaving' between the two side walls of the microchannel. (MOV 660 kb)
Supplementary Video 5
Representative 'walking' mode of control T cells in microchannels. CD8+ T cells 4-5 days post-activation were labeled with CMTMR and then treated with vehicle control and injected into variable size microchannels. Representative movie of the behavior of a 'walking' control T cell in a microchannel over time. Brightfield and TIRF images were taken at 5 sec intervals for 5 min with a 100x TIRF objective. The brightfield images were overlaid with the TIRF adhesion area images (green). White arrows highlight the presence of simultaneous distinct adhesion zones arising in the direction of motion. (MOV 3632 kb)
Supplementary Video 6
Representative 'sliding' mode of blebbistatin treated T cells in microchannels. CD8+ T cells 4-5 days post-activation were labeled with CMTMR and then treated with 100 μm blebbistatin (racemic mix) and injected into variable size microchannels. Representative movie of the behavior of a 'sliding' blebbistatin treated T cell in a microchannel over time. Brightfield and TIRF images were taken at 5 sec intervals for 5 min with a 100x TIRF objective. The brightfield images were overlaid with the TIRF adhesion area images (green). As opposed to the 'walking' mode, the 'sliding' blebbistatin treated T cell shows only one main adhesion zone and has extended contact with a microchannel side wall. (MOV 4581 kb)
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Jacobelli, J., Friedman, R., Conti, M. et al. Confinement-optimized three-dimensional T cell amoeboid motility is modulated via myosin IIA–regulated adhesions. Nat Immunol 11, 953–961 (2010). https://doi.org/10.1038/ni.1936
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DOI: https://doi.org/10.1038/ni.1936
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