Abstract
For several decades, microglia were considered to be subordinated to neurons. However, growing evidence indicates that microglia play key roles in the normal functioning of the nervous system, as well as in age-dependent changes and neurodegenerative diseases. As the brain ages, microglia acquire a phenotype that can be increasingly inflammatory and cytotoxic (dysfunctional microglia), generating a hostile environment for neurons. There is mounting evidence that this process facilitates the development of neurodegenerative diseases, for which the greatest risk factor is age. In neurodegenerative diseases, the abnormal inflammatory response can depend on the impairment of the endogenous activation control of aging microglia that potentiate the release of potentially detrimental factors such as cytokines and oxidative stress mediators. This chapter will discuss key aging-dependent changes occurring in microglia, the inflammatory and oxidative environment they establish, their impaired regulation, and their interaction and effect on neurons. In addition, the role of complement in the neuron-microglia interaction and their modeling of neural circuits through microglia-mediated phagocytosis in development will be highlighted, as well as the growing evidence on its contribution in neurodegenerative processes.
Abbreviations
- ATP:
-
Adenosine triphosphate
- bFGF:
-
Basic fibroblast growth factor
- C3a:
-
Anaphylatoxin originating from activation and cleavage of complement component 3
- C3b:
-
By-products of the classical pathway of complement activation (C3)
- C3d:
-
Breakdown products of C3b
- C5a:
-
Anaphylatoxin originating from activation and cleavage of complement 5
- C5b:
-
By-products of the classical pathway of complement activation (C5)
- CNS:
-
Central nervous system
- CR3; CD11b/CD18:
-
Complement receptor 3
- CX3CL1:
-
CX3C chemokine subclass (fractalkine)
- CX3CR1:
-
Fractalkine receptor
- IFNγ:
-
Interferon gamma
- IL-1β:
-
Interleukin-1β
- IL-6:
-
Interleukin-6
- IL-10:
-
Interleukin-10
- LPS:
-
Lipopolysaccharides
- MHC II:
-
Class II molecules of major histocompatibility complex
- NGF:
-
Nerve growth factor
- NMDA:
-
N-Methyl-D-aspartate
- NO:
-
Nitric oxide
- TGFβ:
-
Transforming growth factor β
- TNFα:
-
Tumor necrosis factor α
- TREM2:
-
Triggering receptor expressed on myeloid cells 2
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Acknowledgments
The authors acknowledge the support from the Agencia Nacional de Investigación y Desarrollo-Fondo Nacional de Desarrollo Científico y Tecnológico (ANID-FONDECYT) grant 1172647, ANID-REDES 190187, and Universia Santander to RvB.
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Triolo-Mieses, M., Fadic, R., von Bernhardi, R. (2021). Microglial Cell Dysregulation in the Aged Brain and Neurodegeneration. In: Kostrzewa, R.M. (eds) Handbook of Neurotoxicity. Springer, Cham. https://doi.org/10.1007/978-3-030-71519-9_180-1
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