Neuroinflammation in Post-Ischemic Brain
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ABSTRACT
Acute neuroinflammation occurring immediately after cerebral ischemia lasts for a few days. Cytokines and chemokines promote the migration of neutrophils and macrophages to the site of inflammation in the brain. Neuroinflammation lasting 2-6 weeks is known as subacute neuroinflammation, while chronic post-ischemic inflammation lasts for months or years. Macrophages, lymphocytes, and plasma cells predominate in chronic neuroinflammation, in contrast to neutrophils that predominate in acute neuroinflammation. In addition to their harmful impact on the ischemic brain, inflammatory mediators may also exert beneficial effects in stroke recovery. The role of secondary inflammatory cells in the pathophysiology of brain ischemia are still less understood. Late post-ischemic neuroinflammation leads to secondary damage of neuronal cells. In this chapter, the role of leukocytes, T cells, T regs, B cells, neutrophils, macrophages, microglia, astrocytes, cytokines, and transcription factors in the post-ischemic brain are discussed. Post-ischemic thrombo-inflammation and the role of platelets, recently considered as a part of the innate immune system, are also addressed. The current pharmacotherapy and future strategies for the treatment of neuroinflammation in post-ischemic brain as well as the limitations of translation between preclinical and clinical studies are presented.
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