Cited by 2,098Traumatic Brain Injury ResearchTraumatic Brain Injury and Neurovascular DisturbancesAlzheimer's disease research and treatments

The spectrum of disease in chronic traumatic encephalopathy

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McKee, Ann C., Stein, Thor D., Nowinski, Christopher J., Stern, Robert A., Daneshvar, Daniel H., Alvarez, Victor E., Lee, Hyo-Soon, Hall, Garth +15 more·2013·Brain

Abstract

Chronic traumatic encephalopathy is a progressive tauopathy that occurs as a consequence of repetitive mild traumatic brain injury. We analysed post-mortem brains obtained from a cohort of 85 subjects with histories of repetitive mild traumatic brain injury and found evidence of chronic traumatic encephalopathy in 68 subjects: all males, ranging in age from 17 to 98 years (mean 59.5 years), including 64 athletes, 21 military veterans (86% of whom were also athletes) and one individual who engaged in self-injurious head banging behaviour. Eighteen age- and gender-matched individuals without a history of repetitive mild traumatic brain injury served as control subjects. In chronic traumatic encephalopathy, the spectrum of hyperphosphorylated tau pathology ranged in severity from focal perivascular epicentres of neurofibrillary tangles in the frontal neocortex to severe tauopathy affecting widespread brain regions, including the medial temporal lobe, thereby allowing a progressive staging of pathology from stages I-IV. Multifocal axonal varicosities and axonal loss were found in deep cortex and subcortical white matter at all stages of chronic traumatic encephalopathy. TAR DNA-binding protein 43 immunoreactive inclusions and neurites were also found in 85% of cases, ranging from focal pathology in stages I-III to widespread inclusions and neurites in stage IV. Symptoms in stage I chronic traumatic encephalopathy included headache and loss of attention and concentration. Additional symptoms in stage II included depression, explosivity and short-term memory loss. In stage III, executive dysfunction and cognitive impairment were found, and in stage IV, dementia, word-finding difficulty and aggression were characteristic. Data on athletic exposure were available for 34 American football players; the stage of chronic traumatic encephalopathy correlated with increased duration of football play, survival after football and age at death. Chronic traumatic encephalopathy was the sole diagnosis in 43 cases (63%); eight were also diagnosed with motor neuron disease (12%), seven with Alzheimer's disease (11%), 11 with Lewy body disease (16%) and four with frontotemporal lobar degeneration (6%). There is an ordered and predictable progression of hyperphosphorylated tau abnormalities through the nervous system in chronic traumatic encephalopathy that occurs in conjunction with widespread axonal disruption and loss. The frequent association of chronic traumatic encephalopathy with other neurodegenerative disorders suggests that repetitive brain trauma and hyperphosphorylated tau protein deposition promote the accumulation of other abnormally aggregated proteins including TAR DNA-binding protein 43, amyloid beta protein and alpha-synuclein.

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Crossref · 10.1093/brain/aws307

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  • Prior to 2015, there were no agreed upon neuropathological criteria for CTE, and the criteria put forward by the two research groups in the US differed.

    “Prior to 2015, there were no agreed upon neuropathological criteria for CTE, and the criteria put forward by the two research groups in the US differed [15, 16].”

    From The Need to Separate Chronic Traumatic Encephalopathy Neuropathology from Clinical Features (2017) · cites this paper as [16]

    The 'Definition of chronic traumatic encephalopathy' section sets out this research group's neuropathological criteria for CTE. Our copy does not say that agreed neuropathological criteria were lacking before 2015 or compare criteria proposed by two US research groups. Its statement that clinical criteria needed to be established concerns a different kind of criteria. (LLM, conf=0.76)

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  • It is well established that a large percentage of former athletes identified as having CTE neuropathology also have neuropathology associated with age related neurodegenerative diseases such as AD, PD, Lewy body disease, hippocampal sclerosis, and ALS to the extent that they meet full neuropathological criteria for an alternative, well-characterized neurodegenerative disease.

    “It is now well established that a large percentage of former athletes identified as having CTE neuropathology also have neuropathology associated with age related neurodegenerative diseases such as AD, PD, Lewy body disease, hippocampal sclerosis, and ALS [14, 41–44] to the extent that they meet full neuropathological criteria for an alternative, well-characterized neurodegenerative disease [16].”

    From The Need to Separate Chronic Traumatic Encephalopathy Neuropathology from Clinical Features (2017) · cites this paper as [16]

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  • Over the past decade, the clinical features attributed to CTE have been expanded greatly and include virtually any mental health or neurological symptom or problem present prior to death.

    “Over the past decade, the clinical features attributed to CTE have been expanded greatly and include virtually any mental health or neurological symptom or problem present prior to death”

    From The Need to Separate Chronic Traumatic Encephalopathy Neuropathology from Clinical Features (2017) · cites this paper as [16]

    The Introduction and Clinical symptoms section associate CTE with a wide range of psychiatric, cognitive and neurological symptoms. They do not say that the list expanded greatly over the past decade or that virtually any symptom present before death is attributed to CTE. (LLM, conf=0.85)

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  • The compact NFTs observed are morphologically most like those seen in primary age-related tauopathy (PART), Alzheimer's disease (AD), and chronic traumatic encephalopathy (CTE), but the topographical distribution and immunostaining characteristics differ from these more common tauopathies.

    “The compact NFTs observed are morphologically most like those seen in primary age-related tauopathy (PART) [4], Alzheimer’s disease (AD) [22], and chronic traumatic encephalopathy (CTE) [13, 14], but the topographical distribution and immunostaining characteristics differ from these more common tauopathies in several respects.”

    From Tuberous sclerosis complex is associated with a novel human tauopathy (2023) · cites this paper as [14]

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  • PART, AD, and CTE all show a balanced 3R/4R tauopathy, prominent neuropil threads, and ready detection with CP13, MC1, and p62 antibodies.

    “Finally, PART, AD, and CTE all show a balanced 3R/4R tauopathy, prominent neuropil threads, and ready detection with CP13, MC1, and p62 antibodies [14, 20, 24]”

    From Tuberous sclerosis complex is associated with a novel human tauopathy (2023) · cites this paper as [14]

    The Neuropathology of chronic traumatic encephalopathy section reports that CTE tangles stain for both 3R and 4R tau, and Figure 1 describes CP-13-positive neuropil threads in CTE. It does not establish a balanced 3R/4R ratio or detection with MC1 and p62; the paper also does not address PART. Its comparison table discusses 3R and 4R tau in AD, but does not establish the full set of shared features claimed for all three conditions. (LLM, conf=0.88)

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Cites

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Authors
McKee, A. C., Stein, T. D., Nowinski, C. J., Stern, R. A., Daneshvar, D. H., Alvarez, V. E., Lee, H.-S., Hall, G., Wojtowicz, S. M., Baugh, C. M., Riley, D. O., Kubilus, C. A., Cormier, K. A., Jacobs, M. A., Martin, B. R., Abraham, C. R., Ikezu, T., Reichard, R. R., Wolozin, B. L., Budson, A. E., Goldstein, L. E., Kowall, N. W., & Cantu, R. C.
Affiliations
  • United States Department of Veterans Affairs (US)
  • Boston University (US)
  • University of Massachusetts Lowell (US)
  • Mayo Clinic (US)
Venue
Brain
Published
2012-12-02
Volume
136
Issue
1
Pages
43-64
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2141679195
Cited by
2,098
References
85
Citations by year
2026: 84 · 2025: 117 · 2024: 116 · 2023: 123 · 2022: 133 · 2021: 168 · 2020: 204 · 2019: 196 · 2018: 176 · 2017: 172 · 2016: 176 · 2015: 172 · 2014: 149 · 2013: 104 · 2012: 1
FWCI
101.18
Type
journal article
Language
en
Open access
Locations
  • Brain (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Veterans Affairs (B6796-C, I01 CX001038, AG13846, P30 AG13846, CSP501)
  • National Operating Committee on Standards for Athletic Equipment
  • Traumatic Brain Injury Center of Excellence
  • National Institute on Aging (R01AG1649, P30AG013846)
  • National Institute of Neurological Disorders and Stroke (R56NS078337, R21NS066108, R21NS073679, R01NS078337, R01NS060872)
  • National Institute of Environmental Health Sciences (R01ES020395)
  • National Institute of Child Health and Human Development
Topics
  • Health Sciences › Medicine › Epidemiology › Traumatic Brain Injury Research
  • Health Sciences › Medicine › Neurology › Traumatic Brain Injury and Neurovascular Disturbances
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
chronic traumatic encephalopathy, repetitive mild traumatic brain injury, hyperphosphorylated tau, neurofibrillary tangles, axonal varicosities, axonal loss, TDP-43 inclusions, cognitive impairment, dementia, motor neuron disease, Alzheimer's disease, Lewy body disease, frontotemporal lobar degeneration, American football players, military veterans
MeSH terms
Adolescent, Adult, Aged, Aged, 80 and over, Brain, Football, Humans, Male, Middle Aged, Veterans, Neurofibrillary Tangles, tau Proteins, Disease Progression, Brain Injury, Chronic, Tauopathies, Athletes

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