Journal
NATURE IMMUNOLOGY
Volume 19, Issue 10, Pages 1048-1058Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41590-018-0212-1
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The predominant type of immune cell in the brain is the microglia, a type of tissue-resident macrophage. In a variety of neurodegenerative settings, microglia alter their transcriptional profile, morphology and function in similar ways; thus, these activated cells have been called 'degeneration-or disease-associated microglia' (DAM). These activated microglia can perform different functions and exert both positive effects and negative effects in different mouse disease models. In humans, mutations in genes expressed in microglia are linked to various neurodegenerative diseases. Here we provide an overview of the common microglial response to neurodegeneration and key contributing pathways; delineate the multifaceted functions of activated microglia spanning various diseases; and discuss insights from the study of human disease-associated genes. We argue that strong evidence from both mouse models and human genetics causally links the function of activated microglia to neurodegeneration.
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