Abstract
T cell migration is essential for T cell responses; it allows for the detection of cognate antigen at the surface of antigen-presenting cells and for interactions with other cells involved in the immune response. Although appearing random, growing evidence suggests that T cell motility patterns are strategic and governed by mechanisms that are optimized for both the activation stage of the cell and for environment-specific cues. In this Opinion article, we discuss how the combined effects of T cell-intrinsic and -extrinsic forces influence T cell motility patterns in the context of highly complex tissues that are filled with other cells involved in parallel motility. In particular, we examine how insights from 'search theory' can be used to describe T cell movement across an 'exploitation–exploration trade-off' in the context of activation versus effector function and lymph nodes versus peripheral tissues.
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Acknowledgements
The authors thank E. Roberts for critical reading of the manuscript and the Advanced Study Group at Max-Planck-Institut für Physik komplexer Systeme (MPIPKS) on Statistical Physics and Anomalous Dynamics in Foraging for insightful discussions on anomalous processes. This work was supported by grants from US NIH (R01AI052116 and R01AI114787 to M.F.K.; R03AI119220 to A.G.) and the Human Frontier Science Program (RGY0084/2011 to F.B.).
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Glossary
- Chemokinesis
-
Migration driven by soluble chemokines, without any cue gradient to provide a directional bias.
- Haptokinesis
-
Migration along a surface, utilizing immobilized ligands such as chemokines or integrins, without any cue gradient to provide a directional bias.
- Chemotaxis
-
Migration driven by a gradient of soluble chemokines, which occurs when an asymmetry in chemoattractant (such as rate and density) exists and local cue gradients can be followed.
- Haptotaxis
-
Migration along a surface that is guided by a gradient of immobilized chemoattractants or adhesion receptor ligands, which provides a directional bias.
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Krummel, M., Bartumeus, F. & Gérard, A. T cell migration, search strategies and mechanisms. Nat Rev Immunol 16, 193–201 (2016). https://doi.org/10.1038/nri.2015.16
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DOI: https://doi.org/10.1038/nri.2015.16
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