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2016 ; 1630
(ä): 225-40
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Is phosphorylated tau unique to chronic traumatic encephalopathy? Phosphorylated
tau in epileptic brain and chronic traumatic encephalopathy
#MMPMID26556772
Puvenna V
; Engeler M
; Banjara M
; Brennan C
; Schreiber P
; Dadas A
; Bahrami A
; Solanki J
; Bandyopadhyay A
; Morris JK
; Bernick C
; Ghosh C
; Rapp E
; Bazarian JJ
; Janigro D
Brain Res
2016[Jan]; 1630
(ä): 225-40
PMID26556772
show ga
Repetitive traumatic brain injury (rTBI) is one of the major risk factors for the
abnormal deposition of phosphorylated tau (PT) in the brain and chronic traumatic
encephalopathy (CTE). CTE and temporal lobe epilepsy (TLE) affect the limbic
system, but no comparative studies on PT distribution in TLE and CTE are
available. It is also unclear whether PT pathology results from repeated head
hits (rTBI). These gaps prevent a thorough understanding of the pathogenesis and
clinical significance of PT, limiting our ability to develop preventative and
therapeutic interventions. We quantified PT in TLE and CTE to unveil whether a
history of rTBI is a prerequisite for PT accumulation in the brain. Six
postmortem CTE (mean 73.3 years) and age matched control samples were compared to
19 surgically resected TLE brain specimens (4 months-58 years; mean 27.6 years).
No history of TBI was present in TLE or control; all CTE patients had a history
of rTBI. TLE and CTE brain displayed increased levels of PT as revealed by
immunohistochemistry. No age-dependent changes were noted, as PT was present as
early as 4 months after birth. In TLE and CTE, cortical neurons, perivascular
regions around penetrating pial vessels and meninges were immunopositive for PT;
white matter tracts also displayed robust expression of extracellular PT
organized in bundles parallel to venules. Microscopically, there were extensive
tau-immunoreactive neuronal, astrocytic and degenerating neurites throughout the
brain. In CTE perivascular tangles were most prominent. Overall, significant
differences in staining intensities were found between CTE and control (P<0.01)
but not between CTE and TLE (P=0.08). pS199 tau analysis showed that CTE had the
most high molecular weight tangle-associated tau, whereas epileptic brain
contained low molecular weight tau. Tau deposition may not be specific to rTBI
since TLE recapitulated most of the pathological features of CTE.