Microglial degeneration in the aging brain - bad news for neurons?
Open accessAbstract
We have long promulgated the idea that microglial cells serve an entirely beneficial role in the central nervous system (CNS), not only as immunological sentinels to fend off potentially dangerous infections, but also as constitutively neuroprotective glia that help sustain neuronal function in the normal and especially in the injured CNS when microglia become activated. In recent years, we have reported on the presence of degenerating microglial cells, which are prominent in the brains of aged humans and humans with neurodegenerative diseases, and this has led us to propose a hypothesis stating that loss of microglia and microglial neuroprotective functions could, at least in part, account for aging-related neurodegeneration. In the current review, we sum up the many aspects that characterize microglial activation and compare them to those that characterize microglial senescence and degeneration. We also consider the possible role of oxidative stress as a cause of microglial degeneration. We finish up by discussing the role microglial cells play in terms of amyloid clearance and degradation with the underlying idea that removal of amyloid constitutes a microglial neuroprotective function, which may become compromised during aging.
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Increased Aβ burden with age suggests microglia become senescent and unable to phagocytose Aβ or their ability becomes latent.
“The increased Aβ burden with age suggests that microglia become senescent and are unable to phagocytose Aβ or that their ability to do so becomes latent [101, 302]”
From Microglia and monocytes in inflammatory CNS disease: integrating phenotype and function (2022) · cites this paper as [302]
Section 6 proposes that senescent microglia may become less efficient at phagocytosis, leaving amyloid unremoved, and the paper discusses amyloid clearance as a function that may decline with age. It does not say that aged microglia are unable to phagocytose Aβ or that their ability becomes latent; section 7.1 instead describes microglia actively phagocytosing portions of plaques. The cited passages also do not establish the claim’s premise of an increasing Aβ burden with age. (LLM, conf=0.86)
Experimental — accuracy not yet measuredAnimal studies have implicated microglial dysregulation in aging-associated neurogenic and behavioral deficits.
“Animal studies have implicated microglial dysregulation in aging-associated neurogenic and behavioral deficits (Streit et al, 2008).”
From Microglia Priming with Aging and Stress (2017) · cites this paper as Streit et al, 2008
Microglial senescence has been associated with increased oxidative stress accumulating over cellular lifespan.
“In addition, microglial senescence has also been associated with increased oxidative stress accumulating over cellular lifespan (Streit et al, 2008).”
From Microglia Priming with Aging and Stress (2017) · cites this paper as Streit et al, 2008
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Xu, G. M., Gonzales, V., & Borchelt, D. (2002) · Alzheimer Disease & Associated Disorders · doi:10.1097/00002093-200207000-00011 · Cited by 19 · see citing works
THE ORIGIN AND FORMATION OF SENILE PLAQUES
Ferraro, A. (1931) · Archives of Neurology And Psychiatry · doi:10.1001/archneurpsyc.1931.02230050118006 · Cited by 18 · see citing works
Real-Time Detection of Reactive Oxygen Intermediates From Single Microglial Cells
Twig, G., Jung, S., Messerli, M. A., Smith, P. J., & Shirihai, O. S. (2001) · Biological Bulletin · doi:10.2307/1543355 · Cited by 16 · see citing works
Kaur, C., & You, Y. (2000) · Neuroscience Letters · doi:10.1016/s0304-3940(00)01306-9 · Cited by 14 · see citing works
Chronically active: activation of microglial proteolysis in ageing and neurodegeneration
Stolzing, A., Sethe, S. C., & Grune, T. (2005) · Redox Report · doi:10.1179/135100005x70198 · Cited by 11 · see citing works
Flagged first, then by citations
Cited by
Sorted by citations
Age-related alterations in the dynamic behavior of microglia
Damani, M. R., Zhao, L., Fontainhas, A. M., Amaral, J., Fariss, R. N., & Wong, W. T. (2011) · Aging Cell · doi:10.1111/j.1474-9726.2010.00660.x · Cited by 504 · see citing works
Microglia Priming with Aging and Stress
Niraula, A., Sheridan, J. F., & Godbout, J. P. (2017) · Neuropsychopharmacology · doi:10.1038/npp.2016.185 · Cited by 398 · see citing works
Njie, E. G., Boelen, E., Stassen, F. R., Steinbusch, H. W. M., Borchelt, D. R., & Streit, W. J. (2012) · Neurobiology of Aging · doi:10.1016/j.neurobiolaging.2010.05.008 · Cited by 335 · see citing works
Self-citationHomeostatic and injury‐induced microglia behavior in the aging brain
Hefendehl, J. K., Neher, J. J., Sühs, R. B., Kohsaka, S., Skodras, A., & Jucker, M. (2014) · Aging Cell · doi:10.1111/acel.12149 · Cited by 319 · see citing works
Effects of aging and sensory loss on glial cells in mouse visual and auditory cortices
Tremblay, M., Zettel, M. L., Ison, J. R., Allen, P. D., & Majewska, A. K. (2012) · Glia · doi:10.1002/glia.22287 · Cited by 309 · see citing works
Lopes, K. O., Sparks, D. L., & Streit, W. J. (2008) · Glia · doi:10.1002/glia.20678 · Cited by 262 · see citing works
Self-citationMicroglia in the developing brain: a potential target with lifetime effects
Harry, G. J., & Kraft, A. D. (2012) · NeuroToxicology · doi:10.1016/j.neuro.2012.01.012 · Cited by 250 · see citing works
Microglia in the aging brain: relevance to neurodegeneration
Luo, X.-G., Ding, J.-Q., & Chen, S.-D. (2010) · Molecular Neurodegeneration · doi:10.1186/1750-1326-5-12 · Cited by 236 · see citing works
“Even though Streit et al[64] gave a suggestion in the difference between the two, describing that “hypertrophy and retraction and thickening of process” occurs in activation while “deramification, shortening and twisting of processes, cytoplasmic fragmentation” are features of aging, so far no definite biomarker or mo…”
BackgroundEssential tremor — Neurodegenerative or nondegenerative disease towards a working definition of ET
Deuschl, G., & Elble, R. (2009) · Movement Disorders · doi:10.1002/mds.22755 · Cited by 232 · see citing works
Parkinson’s disease as a result of aging
Rodriguez, M., Rodriguez‐Sabate, C., Morales, I., Sanchez, A., & Sabate, M. (2015) · Aging Cell · doi:10.1111/acel.12312 · Cited by 214 · see citing works
Microglia and monocytes in inflammatory CNS disease: integrating phenotype and function
Spiteri, A. G., Wishart, C. L., Pamphlett, R., Locatelli, G., & King, N. J. C. (2022) · Acta Neuropathologica · doi:10.1007/s00401-021-02384-2 · Cited by 216 · see citing works
“The increased Aβ burden with age suggests that microglia become senescent and are unable to phagocytose Aβ or that their ability to do so becomes latent [101, 302].”
BackgroundFunctional diversity of microglia – how heterogeneous are they to begin with?
Hanisch, U.-K. (2013) · Frontiers in Cellular Neuroscience · doi:10.3389/fncel.2013.00065 · Cited by 195 · see citing works
Dysregulated neuronal–microglial cross-talk during aging, stress and inflammation
Jurgens, H. A., & Johnson, R. W. (2012) · Experimental Neurology · doi:10.1016/j.expneurol.2010.11.014 · Cited by 179 · see citing works
Targeting innate immunity for neurodegenerative disorders of the central nervous system
Andreasson, K. I., Bachstetter, A. D., Colonna, M., Ginhoux, F., Holmes, C., Lamb, B., Landreth, G., Lee, D. C., Low, D., Lynch, M. A., et al. (2016) · Journal of Neurochemistry · doi:10.1111/jnc.13667 · Cited by 126 · see citing works
Key Aging-Associated Alterations in Primary Microglia Response to Beta-Amyloid Stimulation
Caldeira, C., Cunha, C., Vaz, A. R., Falcão, A. S., Barateiro, A., Seixas, E., Fernandes, A., & Brites, D. (2017) · Frontiers in Aging Neuroscience · doi:10.3389/fnagi.2017.00277 · Cited by 117 · see citing works
Gulyás, B., Vas, Á., Tóth, M., Takano, A., Varrone, A., Cselényi, Z., Schain, M., Mattsson, P., & Halldin, C. (2011) · NeuroImage · doi:10.1016/j.neuroimage.2011.02.020 · Cited by 94 · see citing works
Microglia recapitulate a hematopoietic master regulator network in the aging human frontal cortex
Wehrspaun, C. C., Haerty, W., & Ponting, C. P. (2015) · Neurobiology of Aging · doi:10.1016/j.neurobiolaging.2015.04.008 · Cited by 64 · see citing works
Sequence Variants of Toll Like Receptor 4 and Late-Onset Alzheimer's Disease
Chen, Y.-C., Yip, P.-K., Huang, Y.-L., Sun, Y., Wen, L.-L., Chu, Y.-M., & Chen, T.-F. (2012) · PLoS ONE · doi:10.1371/journal.pone.0050771 · Cited by 38 · see citing works
- Authors
- Streit, W.
- Venue
- Frontiers in Bioscience
- Publisher
- IMR Press
- Published
- 2008
- Volume
- Volume
- Issue
- 13
- Pages
- 3423
- ISSN
- 1093-4715 (ISSN-L)
- 1093-9946
- DOI
- 10.2741/2937
- OpenAlex
- W1648996057
- Cited by
- 150
- References
- 201
- Citations by year
- 2025: 4 · 2024: 2 · 2023: 3 · 2022: 8 · 2021: 3 · 2020: 6 · 2019: 1 · 2018: 10 · 2017: 7 · 2016: 11 · 2015: 14 · 2014: 5 · 2013: 8 · 2012: 12
- FWCI
- 1.61
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Frontiers in bioscience (publishedVersion)
- PubMed (publishedVersion)
- Funders
- James S. McDonnell Foundation
- National Institutes of Health
- National Institute on Aging (R01AG023665, AG 023665)
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
- Keywords
- microglial senescence, microglial activation, brain aging, neurodegeneration, neuroprotection, oxidative stress, amyloid clearance, microglia, neuroinflammation
- MeSH terms
- Aging, Alzheimer Disease, Animals, Brain, Brain Injuries, Cytosol, Humans, Huntington Disease, Hydrogen Peroxide, Lipofuscin, Nerve Degeneration, Neurons, Parkinson Disease, Cellular Senescence, Microglia, Models, Animal
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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