cAMP bursts control T cell directionality by actin cytoskeleton remodeling

T lymphocyte migration is an essential step to mounting an efficient immune response. The rapid and random motility of these cells which favors their sentinel role is conditioned by chemokines as well as by the physical environment. Morphological changes, underlaid by dynamic actin cytoskeleton remodeling, are observed throughout migration but especially when the cell modifies its trajectory. Using dynamic cell imaging, we investigated the signaling pathways involved in T cell directionality control. We monitored cAMP variation concomitantly with actin distribution upon T lymphocyte migration and highlighted the fact that spontaneous bursts in cAMP starting from the leading edge, are sufficient to promote stable actin redistribution triggering trajectory modification.