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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 Am+J+Pathol
2016 ; 186
(3
): 552-67
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Dendritic Spine Loss and Chronic White Matter Inflammation in a Mouse Model of
Highly Repetitive Head Trauma
#MMPMID26857506
Winston CN
; Noël A
; Neustadtl A
; Parsadanian M
; Barton DJ
; Chellappa D
; Wilkins TE
; Alikhani AD
; Zapple DN
; Villapol S
; Planel E
; Burns MP
Am J Pathol
2016[Mar]; 186
(3
): 552-67
PMID26857506
show ga
Mild traumatic brain injury (mTBI) is an emerging risk for chronic behavioral,
cognitive, and neurodegenerative conditions. Athletes absorb several hundred
mTBIs each year; however, rodent models of repeat mTBI (rmTBI) are often limited
to impacts in the single digits. Herein, we describe the effects of 30 rmTBIs,
examining structural and pathological changes in mice up to 365 days after
injury. We found that single mTBI causes a brief loss of consciousness and a
transient reduction in dendritic spines, reflecting a loss of excitatory
synapses. Single mTBI does not cause axonal injury, neuroinflammation, or cell
death in the gray or white matter. Thirty rmTBIs with a 1-day interval between
each mTBI do not cause dendritic spine loss; however, when the interinjury
interval is increased to 7 days, dendritic spine loss is reinstated. Thirty
rmTBIs cause white matter pathology characterized by positive silver and
Fluoro-Jade B staining, and microglial proliferation and activation. This
pathology continues to develop through 60 days, and is still apparent at 365
days, after injury. However, rmTBIs did not increase ?-amyloid levels or tau
phosphorylation in the 3xTg-AD mouse model of Alzheimer disease. Our data reveal
that single mTBI causes a transient loss of synapses, but that rmTBIs habituate
to repetitive injury within a short time period. rmTBI causes the development of
progressive white matter pathology that continues for months after the final
impact.