Chronic Traumatic Encephalopathy (Cte) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Chronic Traumatic Encephalopathy (CTE) is a progressive neurodegenerative disease believed to be caused by repeated traumatic brain injuries (TBIs), including concussions and subconcussive hits to the head. CTE is characterized by the accumulation of abnormal tau protein in the brain, leading to progressive brain degeneration and cognitive, behavioral, and motor impairments[1][2].
CTE was first described in 1928 by Dr. Harrison Martland as "punch drunk" syndrome in boxers. Since then, the condition has been recognized in athletes from various contact sports, military veterans, and individuals with a history of repeated head trauma. The disease can only be definitively diagnosed post-mortem through neuropathological examination, though research into in vivo biomarkers is ongoing[3][4].
The hallmark pathological finding in CTE is the abnormal accumulation of hyperphosphorylated tau (p-tau) protein in neurons and astrocytes, forming neurofibrillary tangles (NFTs). These tangles are distributed in a unique pattern distinct from other tauopathies like Alzheimer's disease[1:1][5]:
Repeated traumatic brain injury triggers a cascade of pathological events[6][7]:
CTE has been documented in:
CTE symptoms typically appear years to decades after the last traumatic brain injury and progress over time[2:1][10]:
The disease typically progresses through stages:
Currently, CTE can only be definitively diagnosed post-mortem. In vivo diagnostic criteria are being developed[3:1][11]:
Proposed clinical criteria (for research):
Promising biomarkers under investigation include[12][13]:
Neuropathological criteria require[4:1][5:1]:
No disease-modifying treatments exist for CTE. Management focuses on symptom relief[2:2][14]:
Pharmacological:
Non-pharmacological:
Prevention is critical given the irreversibility of CTE[8:1][15]:
The true prevalence of CTE is unknown due to lack of in vivo diagnosis. Studies of affected populations show[1:3][9:1]:
CTE imposes significant healthcare and social costs:
Key research areas include:
The study of Chronic Traumatic Encephalopathy (Cte) has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
McKee AC, Cantu RC, Nowinski CJ, et al. Chronic traumatic encephalopathy in athletes: progressive tauopathy after repetitive head injury. J Neuropathol Exp Neurol. 2009;68(7):709-735. DOI:10.1097/NEN.0b013e3181a5d8c6 ↩︎ ↩︎ ↩︎ ↩︎
Stern RA, Riley DO, Daneshvar DH, Nowinski CJ, Cantu RC, McKee AC. Long-term consequences of repetitive brain trauma: chronic traumatic encephalopathy. PM R. 2011;3(10 Suppl 2):S460-S467. DOI:10.1016/j.pmrj.2011.08.008 ↩︎ ↩︎ ↩︎
Montenigro PH, Baugh CM, Daneshvar DH, et al. Clinical subtypes of chronic traumatic encephalopathy: literature review and proposed research diagnostic criteria for traumatic encephalopathy syndrome. Alzheimers Res Ther. 2014;6(5):68. DOI:10.1186/alzrt277 ↩︎ ↩︎
McKee AC, Stein TD, Nowinski CJ, et al. The spectrum of disease in chronic traumatic encephalopathy. Brain. 2013;136(Pt 1):43-64. DOI:10.1093/brain/aws307 ↩︎ ↩︎
Arnold M, Nakashima M, Gibbs K, et al. Clinical assessment of chronic traumatic encephalopathy: progress and problems. Brain Sci. 2020;10(12):E951. DOI:10.3390/brainsci10120951 ↩︎ ↩︎
Smith DH, Meaney DF, Shull WH. Diffuse axonal injury in head trauma. J Head Trauma Rehabil. 2003;18(4):307-316. DOI:10.1097/00001199-200307000-00003 ↩︎
Blennow K, Hardy J, Zetterberg H. The neuropathology and neurobiology of traumatic brain injury. Neuron. 2012;76(5):886-899. DOI:10.1016/j.neuron.2012.11.021 ↩︎
Cantu RC, Gean AD. Second-impact syndrome and a small subdural hematoma: an uncommon catastrophic result of repetitive head injury with a characteristic imaging appearance. J Neurotrauma. 2010;27(9):1557-1564. DOI:10.1089/neu.2010.1426 ↩︎ ↩︎
Mez J, Daneshvar DH, Kiernan PT, et al. Clinicopathological evaluation of chronic traumatic encephalopathy in players of American football. JAMA. 2017;318(4):360-370. DOI:10.1001/jama.2017.8334 ↩︎ ↩︎
Reams N, Eckner JT, Almeida AA, et al. A case series of clinical diagnosis of chronic traumatic encephalopathy in former professional athletes. J Neurol Sci. 2016;367:98-103. DOI:10.1016/j.jns.2016.05.022 ↩︎
Montenegro PH, Bernick C, Cantu RC, et al. Clinical features of chronic traumatic encephalopathy. JAMA Neurol. 2015;72(3):331-338. DOI:10.1001/jamaneurol.2014.3098 ↩︎
Rubenstein R, Chang B, Yue JK, et al. Comparing plasma phospho-tau, total tau, and phospho-tau:total tau ratio as acute and chronic traumatic brain injury biomarkers. JAMA Neurol. 2017;74(9):1063-1072. DOI:10.1001/jamaneurol.2017.0655 ↩︎
Dickstein DL, COMI M, Bhattacharjee S, et al. Chronic traumatic encephalopathy: tau pathology and the future of in vivo diagnostics. J Neuropathol Exp Neurol. 2020;79(7):719-728. DOI:10.1093/jnen/nlaa045 ↩︎
Zetterberg H, Blennow K. Chronic traumatic encephalopathy: fluid biomarkers. Handb Clin Neurol. 2018;158:171-182. DOI:10.1016/B978-0-444-63954-7.00017-1 ↩︎
Stamm JM, Bourlas AP, Baugh CM, et al. Age of first exposure to football and later-life cognitive impairment in former NFL players. 2015;84(11): Neurology.1114-1120. DOI:10.1212/WNL.0000000000001358 ↩︎