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2018 ; 10
(ä): 1759091418781921
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Repeated Mild Closed Head Injuries Induce Long-Term White Matter Pathology and
Neuronal Loss That Are Correlated With Behavioral Deficits
#MMPMID29932344
Gold EM
; Vasilevko V
; Hasselmann J
; Tiefenthaler C
; Hoa D
; Ranawaka K
; Cribbs DH
; Cummings BJ
ASN Neuro
2018[Jan]; 10
(ä): 1759091418781921
PMID29932344
show ga
An estimated 5.3 million Americans are living with a disability from a traumatic
brain injury (TBI). There is emerging evidence of the detrimental effects from
repeated mild TBIs (rmTBIs). rmTBI manifests its own unique set of behavioral and
neuropathological changes. A subset of individuals exposed to rmTBI develop
permanent behavioral and pathological consequences, defined postmortem as chronic
traumatic encephalopathy. We have combined components of two classic rodent
models of TBI, the controlled cortical impact model and the weight drop model, to
develop a repeated mild closed head injury (rmCHI) that produces long-term
deficits in several behaviors that correlate with neuropathological changes. Mice
receiving rmCHI performed differently from 1-hit or sham controls on the elevated
plus maze; these deficits persist up to 6 months postinjury (MPI). rmCHI mice
performed worse than 1-hit and control sham mice at 2 MPI and 6 MPI on the Morris
water maze. Mice receiving rmCHI exhibited significant atrophy of the corpus
callosum at both 2 MPI and 6 MPI, as assessed by stereological volume analysis.
Stereological analysis also revealed significant loss of cortical neurons in
comparison with 1-hit and controls. Moreover, both of these pathological changes
correlated with behavioral impairments. In human tau transgenic mice, rmCHI
induced increases in hyperphosphorylated paired helical filament 1 tau in the
hippocampus. This suggests that strategies to restore myelination or reduce
neuronal loss may ameliorate the behavioral deficits observed following rmCHI and
that rmCHI may model chronic traumatic encephalopathy in human tau mice.