Microglial brain region−dependent diversity and selective regional sensitivities to aging

Kathleen Grabert, Tom Michoel, Michail H Karavolos, Sara Clohisey, J Kenneth Baillie, Mark P Stevens, Tom C Freeman, Kim M Summers, Barry W McColl

Research output: Contribution to journalArticlepeer-review

Abstract

Microglia have critical roles in neural development, homeostasis and neuroinflammation and are increasingly implicated in age-related neurological dysfunction. Neurodegeneration often occurs in disease-specific, spatially restricted patterns, the origins of which are unknown. We performed to our knowledge the first genome-wide analysis of microglia from discrete brain regions across the adult lifespan of the mouse, and found that microglia have distinct region-dependent transcriptional identities and age in a regionally variable manner. In the young adult brain, differences in bioenergetic and immunoregulatory pathways were the major sources of heterogeneity and suggested that cerebellar and hippocampal microglia exist in a more immune-vigilant state. Immune function correlated with regional transcriptional patterns. Augmentation of the distinct cerebellar immunophenotype and a contrasting loss in distinction of the hippocampal phenotype among forebrain regions were key features during aging. Microglial diversity may enable regionally localized homeostatic functions but could also underlie region-specific sensitivities to microglial dysregulation and involvement in age-related neurodegeneration.
Original languageEnglish
Pages (from-to)504-516
Number of pages13
JournalNature Neuroscience
Volume19
Issue number3
Early online date18 Jan 2016
DOIs
Publication statusPublished - 31 Mar 2016

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