TY  - JOUR
PY  - 2018//
TI  - Higher exosomal phosphorylated tau and total tau among veterans with combat-related repetitive chronic mild traumatic brain injury
JO  - Brain injury
A1  - Kenney, Kimbra
A1  - Qu, Bao-Xi
A1  - Lai, Chen
A1  - Devoto, Christina
A1  - Motamedi, Vida
A1  - Walker, William C.
A1  - Levin, Harvey S.
A1  - Nolen, Tracy
A1  - Wilde, Elisabeth A.
A1  - Diaz-Arrastia, Ramon
A1  - Gill, Jessica
SP  - 1276
EP  - 1284
VL  - 32
IS  - 10
N2  - OBJECTIVE: The objective of the study is to measure plasma and exosomal levels of tau, phosphorylated tau (p-tau), and amyloid beta (Aβ) in Veterans with historical mild traumatic brain injury (mTBI) and chronic neuropsychological symptoms. <br><br>METHODS: Tau, p-tau, Aβ40, and Aβ42 were measured by ultrasensitive immunoassay in plasma and exosomes from 195 Veterans enrolled in the Chronic Effects of Neurotrauma Consortium Multicenter Observational Study. Protein biomarkers were compared among groups with and without mTBI with loss of consciousness (LOC) or post-traumatic amnesia (PTA), and also in those with and without repetitive (≥3) mTBI (rTBI) compared to those with 0 (TBI-neg) and 1-2 mTBI. <br><br>RESULTS: There were no differences in measures of plasma and exosomal protein levels among mTBI with LOC or PTA, mTBI with alteration of consciousness only or TBI-neg. Exosomal tau and exosomal p-tau were elevated in rTBI compared to those with 2 or fewer mTBIs and TBI-neg (p < 0.05). Elevations of exosomal tau and p-tau significantly correlated with post-traumatic and post-concussive symptoms, with exosomal tau also relating specifically to cognitive, affective, and somatic post-concussive symptoms (p < 0.05). <br><br>CONCLUSION: rTBI is associated with elevations of exosomal p-tau and exosomal tau, suggesting that blood-based exosomes may provide a peripheral source of informative, centrally derived biomarkers in remote mTBI and that rTBI may contribute to chronic neuropsychological symptoms.<p />  <p>Language: en</p>
LA  - en
SN  - 0269-9052
UR  - http://dx.doi.org/10.1080/02699052.2018.1483530
ID  - ref1
ER  -