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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Neurotrauma
2016 ; 33
(22
): 2034-2043
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Tau Oligomers Derived from Traumatic Brain Injury Cause Cognitive Impairment and
Accelerate Onset of Pathology in Htau Mice
#MMPMID26729399
Gerson J
; Castillo-Carranza DL
; Sengupta U
; Bodani R
; Prough DS
; DeWitt DS
; Hawkins BE
; Kayed R
J Neurotrauma
2016[Nov]; 33
(22
): 2034-2043
PMID26729399
show ga
Tau aggregation is a pathological feature of numerous neurodegenerative disorders
and has also been shown to occur under certain conditions of traumatic brain
injury (TBI). Currently, no effective treatments exist for the long-term effects
of TBI. In some cases, TBI not only induces cognitive changes immediately
post-injury, but also leads to increased incidence of neurodegeneration later in
life. Growing evidence from our lab and others suggests that the oligomeric forms
of tau initiate the onset and spread of neurodegenerative tauopathies.
Previously, we have shown increased levels of brain-derived tau oligomers in
autopsy samples from patients diagnosed with Alzheimer's disease. We have also
shown similar increases in tau oligomers in animal models of neurodegenerative
diseases and TBI. In the current study, we evaluated the presence of tau
oligomers in blast-induced TBI. To test the direct impact of TBI-derived tau
oligomer toxicity, we isolated tau oligomers from brains of rats that underwent
either a blast- or a fluid percussion injury-induced TBI. Oligomers were
characterized biochemically and morphologically and were then injected into
hippocampi of mice overexpressing human tau (Htau). Mice were cognitively
evaluated and brains were collected for immunological analysis after testing. We
found that tau oligomers form as a result of brain injury in two different models
of TBI. Additionally, these oligomers accelerated onset of cognitive deficits
when injected into brains of Htau mice. Tau oligomer levels increased in the
hippocampal injection sites and cerebellum, suggesting that tau oligomers may be
responsible for seeding the spread of pathology post-TBI. Our results suggest
that tau oligomers play an important role in the toxicity underlying TBI and may
be a viable therapeutic target.