Role of T lymphocytes and interferon-gamma in ischemic stroke

Circulation
Gokhan YilmazD Neil Granger

Abstract

Although lymphocyte recruitment and activation are associated with cerebral ischemia-reperfusion (I/R) injury, the contributions of specific lymphocyte subpopulations and lymphocyte-derived interferon-gamma (IFN-gamma) to stroke remain unknown. The objectives of this study were to define the contribution of specific populations of lymphocytes to the inflammatory and prothrombogenic responses elicited in the cerebral microvasculature by I/R and to investigate the role of T-cell-associated IFN-gamma in the pathogenesis of ischemic stroke. Middle cerebral artery occlusion was induced for 1 hour (followed by 4 or 24 hours of reperfusion) in wild-type mice and mice deficient in lymphocytes (Rag1(-/-)), CD4+ T cells, CD8+ T cells, B cells, or IFN-gamma. Platelet and leukocyte adhesion was assessed in cortical venules with intravital video microscopy. Neurological deficit and infarct volume were determined 24 hours after reperfusion. Rag1(-/-), CD4+ T-cell(-/-), CD8+ T-cell(-/-), and IFN-gamma(-/-) mice exhibited comparable significant reductions in I/R-induced leukocyte and platelet adhesion compared with wild-type mice exposed to I/R. Infarct volume was reduced and I/R-induced neurological deficit was improved in immunodeficient Rag...Continue Reading

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