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Neuronal Loss after Stroke Due to Microglial Phagocytosis of Stressed Neurons.

Published version
Peer-reviewed

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Authors

Brown, Guy C 

Abstract

After stroke, there is a rapid necrosis of all cells in the infarct, followed by a delayed loss of neurons both in brain areas surrounding the infarct, known as 'selective neuronal loss', and in brain areas remote from, but connected to, the infarct, known as 'secondary neurodegeneration'. Here we review evidence indicating that this delayed loss of neurons after stroke is mediated by the microglial phagocytosis of stressed neurons. After a stroke, neurons are stressed by ongoing ischemia, excitotoxicity and/or inflammation and are known to: (i) release "find-me" signals such as ATP, (ii) expose "eat-me" signals such as phosphatidylserine, and (iii) bind to opsonins, such as complement components C1q and C3b, inducing microglia to phagocytose such neurons. Blocking these factors on neurons, or their phagocytic receptors on microglia, can prevent delayed neuronal loss and behavioral deficits in rodent models of ischemic stroke. Phagocytic receptors on microglia may be attractive treatment targets to prevent delayed neuronal loss after stroke due to the microglial phagocytosis of stressed neurons.

Description

Keywords

cell death, delayed neuronal death, ischemia, microglia, neuronal death, phagocytosis, phagoptosis, secondary neurodegeneration, selective neuronal loss, stroke, Animals, Brain, Humans, Inflammation, Microglia, Neurons, Phagocytosis, Stroke

Journal Title

Int J Mol Sci

Conference Name

Journal ISSN

1661-6596
1422-0067

Volume Title

22

Publisher

MDPI AG
Sponsorship
Medical Research Council (MR/L010593/1)