International Journal of Molecular Sciences Review Molecular Mechanisms of Neuroimmune Crosstalk in the Pathogenesis of Stroke Yun Hwa Choi 1, Collin Laaker 2, Martin Hsu 2, Peter Cismaru 3, Matyas Sandor 4 and Zsuzsanna Fabry 2,4,* 1 School of Pharmacy, University of Wisconsin-Madison, Madison, WI 53705, USA;
[email protected] 2 Neuroscience Training Program, University of Wisconsin-Madison, Madison, WI 53705, USA;
[email protected] (C.L.);
[email protected] (M.H.) 3 Chemistry, University of Wisconsin-Madison, Madison, WI 53705, USA;
[email protected] 4 Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, WI 53705, USA;
[email protected] * Correspondence:
[email protected] Abstract: Stroke disrupts the homeostatic balance within the brain and is associated with a significant accumulation of necrotic cellular debris, fluid, and peripheral immune cells in the central nervous system (CNS). Additionally, cells, antigens, and other factors exit the brain into the periphery via damaged blood–brain barrier cells, glymphatic transport mechanisms, and lymphatic vessels, which dramatically influence the systemic immune response and lead to complex neuroimmune communi- cation. As a result, the immunological response after stroke is a highly dynamic event that involves communication between multiple organ systems and cell types, with significant consequences on not only the initial stroke tissue injury but long-term recovery in the CNS. In this review, we discuss the complex immunological and physiological interactions that occur after stroke with a focus on how the peripheral immune system and CNS communicate to regulate post-stroke brain homeostasis. First, Citation: Choi, Y.H.; Laaker, C.; Hsu, we discuss the post-stroke immune cascade across different contexts as well as homeostatic regulation M.; Cismaru, P.; Sandor, M.; Fabry, Z.