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Leukocyte Recruitment and Ischemic Brain Injury

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Abstract

Leukocytes are recruited into the cerebral microcirculation following an ischemic insult. The leukocyte–endothelial cell adhesion manifested within a few hours after ischemia (followed by reperfusion, I/R) largely reflects an infiltration of neutrophils, while other leukocyte populations appear to dominate the adhesive interactions with the vessel wall at 24 h of reperfusion. The influx of rolling and adherent leukocytes is accompanied by the recruitment of adherent platelets, which likely enhances the cytotoxic potential of the leukocytes to which they are attached. The recruitment of leukocytes and platelets in the postischemic brain is mediated by specific adhesion glycoproteins expressed by the activated blood cells and on cerebral microvascular endothelial cells. This process is also modulated by different signaling pathways (e.g., CD40/CD40L, Notch) and cytokines (e.g., RANTES) that are activated/released following I/R. Some of the known risk factors for cardiovascular disease, including hypercholesterolemia and obesity appear to exacerbate the leukocyte and platelet recruitment elicited by brain I/R. Although lymphocyte–endothelial cell and –platelet interactions in the postischemic cerebral microcirculation have not been evaluated to date, recent evidence in experimental animals implicate both CD4+ and CD8+ T-lymphocytes in the cerebral microvascular dysfunction, inflammation, and tissue injury associated with brain I/R. Evidence implicating regulatory T-cells as cerebroprotective modulators of the inflammatory and tissue injury responses to brain I/R support a continued focus on leukocytes as a target for therapeutic intervention in ischemic stroke.

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Acknowledgments

This work was supported by a grant from the National Heart Lung & Blood Institute (HL26441) and funds from the Malcolm Feist Cardiovascular Endowment.

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  1. Department of Molecular & Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA, 71130-3932, USA

    Gokhan Yilmaz & D. Neil Granger

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Yilmaz, G., Granger, D.N. Leukocyte Recruitment and Ischemic Brain Injury. Neuromol Med 12, 193–204 (2010). https://doi.org/10.1007/s12017-009-8074-1

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