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Timmerman, R.; Burm, S.M.; Bajramovic, J.J.
Neurochemistry international, January 2021, 2021-01-00, 20210101, Letnik: 142Journal Article
As tissue-resident macrophages of the brain, microglia are increasingly considered as cellular targets for therapeutical intervention. Innate immune responses in particular have been implicated in central nervous system (CNS) infections, neuro-oncology, neuroinflammatory and neurodegenerative diseases. We here review the impact of ‘nature and nurture’ on microglial innate immune responses and summarize documented tissue-specific adaptations. Overall, such adaptations are associated with regulatory processes rather than with overt differences in the expressed repertoire of activating receptors of different tissue-resident macrophages. Microglial responses are characterized by slower kinetics, by a more persistent nature and by a differential usage of downstream enzymes and accessory receptors. We further consider factors like aging, previous exposure to inflammatory stimuli, and differences in the microenvironment that can modulate innate immune responses. The long-life span of microglia in the metabolically active CNS renders them susceptible to the phenomenon of ‘inflammaging’, and major challenges lie in the unraveling of the factors that underlie age-related alterations in microglial behavior. •Both ‘nature and nurture’ have impact on microglial innate immune responses.•Tissue-specific adaptations are mostly associated with regulatory processes.•Microglial responses are characterized by slow kinetics and by a persistent nature.•Microglia use specific downstream enzymes and accessory receptors.•The long-life span of microglia renders them susceptible to ‘inflammaging’.
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