The role of microglia in ischemic preconditioning.

Glia
Ashley McDonough, Jonathan R Weinstein

Abstract

Ischemic preconditioning (IPC) is an experimental phenomenon in which a brief ischemic stimulus confers protection against a subsequent prolonged ischemic event. Initially thought to be due to mechanistic changes in neurons, our understanding of IPC has evolved to encompass a global reprogramming of the Central Nervous System (CNS) after transient ischemia/reperfusion that requires innate immune signaling pathways including Toll-like receptors (TLRs) and Type I interferons. Microglia are the CNS resident neuroimmune cells that express these key innate immune receptors. Studies suggest that microglia are required for IPC-mediated neuronal and axonal protection. Multiple paradigms targeting TLRs have converged on a distinctive Type I interferon response in microglia that is critical for preconditioning-mediated protection against ischemia. These pathways can be targeted through administration of TLR agonists, cytokines including interferon-β, and pharmaceutical agents that induce preconditioning through cross-tolerance mechanisms. Transcriptomic analyses and single cell RNA studies point to specific gene expression signatures in microglia that functionally shift these mutable cells to an immunomodulatory or protective phenotype. ...Continue Reading

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Nov 21, 2019·CNS Neuroscience & Therapeutics·Nadine KerrAmi P Raval
Mar 28, 2021·Acta Pharmacologica Sinica·Hong-Yun WangNai-Hong Chen
Jul 3, 2021·International Journal of Molecular Sciences·Rezan Ashayeri AhmadabadMaryam Khaleghi Ghadiri

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