Cited by 500Traumatic Brain Injury and Neurovascular DisturbancesTraumatic Brain Injury ResearchNeuroinflammation and Neurodegeneration Mechanisms

Progressive Neurodegeneration After Experimental Brain Trauma: Association With Chronic Microglial Activation

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Loane, David J., Kumar, Alok, Stoica, Bogdan A., Cabatbat, Rainier, Faden, Alan I.·2014·Journal of Neuropathology & Experimental Neurology

Abstract

Recent clinical studies indicate that traumatic brain injury (TBI) produces chronic and progressive neurodegenerative changes leading to late neurologic dysfunction, but little is known about the mechanisms underlying such changes. Microglial-mediated neuroinflammationis an important secondary injury mechanism after TBI. In human studies, microglial activation has been found to persist for many years after the initial brain trauma, particularly after moderate to severe TBI. In the present study, adult C57Bl/6 mice were subjected to single moderate-level controlled cortical impact and were followed up by longitudinal T2-weighted magnetic resonance imaging in combination with stereologic histologic assessment of lesion volume expansion, neuronal loss, and microglial activation for up to 1 year after TBI. Persistent microglial activation was observed in the injured cortex through 1 year after injury and was associated with progressive lesion expansion, hippocampal neurodegeneration, and loss of myelin. Notably, highly activated microglia that expressed major histocompatibility complex class II (CR3/43), CD68, and NADPH oxidase (NOX2) were detected at the margins of the expanding lesion at 1 year after injury; biochemical markers of neuroinflammation and oxidative stress were significantly elevated at this time point. These data support emerging clinical TBI findings and provide a mechanistic link between TBI-induced chronic microglial activation and progressive neurodegeneration.

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  • In the minutes following TBI, microglia are recruited via purinergic signaling to clear necrotic debris and adopt a phagocytic state.

    “In the minutes following TBI, microglia are recruited via purinergic signaling to clear necrotic debris and adopt a phagocytic state [100,107,108].”
  • TBI is a biphasic injury: after the mechanical primary injury, a secondary dystrophic state produces long-term dysfunction including elevated neuroinflammation due to blood-brain barrier disruption, increased oxidative stress, and persistent changes in the microglial population.

    “TBI is a biphasic injury: after the mechanical primary injury, a secondary dystrophic state produces long-term dysfunction in the brain that includes elevated neuroinflammation as a result of blood-brain barrier disruption, increased oxidative stress, and persistent changes in the microglial population [100–106].”
  • Post-injury microglia promote increased oxidative damage leading to neurodegeneration through a NOX2-dependent mechanism.

    “Of recent interest is how post-injury microglia promote increased oxidative damage leading to neurodegeneration through a NOX2-dependent mechanism [100,117,118].”
  • Microglia associated with the long-term inflammatory phenotype following TBI are commonly defined as MHC-II/CD86/Cd11b positive, with upregulated expression of NOX24, Tlr4, Trem2, CD68, Clec7a, and Stat1, and higher expression of interferon- and immune-associated signaling genes.

    “Microglia associated with the long-term inflammatory phenotype following TBI are commonly defined as MHC-II/CD86/Cd11b positive, with upregulated expression of NOX24, Tlr4, Trem2, CD68, Clec7a, and Stat1, and higher expression of interferon- and immune-associated signaling genes [100,112,115,116].”

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Authors
Loane, D. J., Kumar, A., Stoica, B. A., Cabatbat, R., & Faden, A. I.
Affiliations
University of Maryland, Baltimore (US)
Corresponding author
Loane, David J.
Venue
Journal of Neuropathology & Experimental Neurology
Published
2014-01
Volume
73
Issue
1
Pages
14-29
ISSN
0022-3069 (ISSN-L)
OpenAlex
W2067451082
Cited by
498
References
49
Citations by year
2026: 35 · 2025: 28 · 2024: 42 · 2023: 39 · 2022: 39 · 2021: 68 · 2020: 56 · 2019: 42 · 2018: 36 · 2017: 41 · 2016: 31 · 2015: 24 · 2014: 17
FWCI
15.23
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuropathology & Experimental Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (R01NS037313, R01NS052568, R01NS082308)
Topics
  • Health Sciences › Medicine › Neurology › Traumatic Brain Injury and Neurovascular Disturbances
  • Health Sciences › Medicine › Epidemiology › Traumatic Brain Injury Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
traumatic brain injury, progressive neurodegeneration, microglial activation, neuroinflammation, controlled cortical impact, lesion expansion, hippocampal neurodegeneration, demyelination, oxidative stress, NADPH oxidase, CD68
MeSH terms
Animals, Brain Injuries, Disease Models, Animal, Male, Mice, Inbred C57BL, Time Factors, Microglia, Disease Progression, Neurodegenerative Diseases, Mice

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