Journal of neurotrauma
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Journal of neurotrauma · Mar 2021
Assessment of the effects of altered amyloid-beta clearance on behavior following repeat closed-head brain injury in APP humanized mice.
Traumatic brain injury (TBI) increases the risk for dementias including Alzheimer's disease (AD) and chronic traumatic encephalopathy. Further, both human and animal model data indicate that amyloid-beta (Aβ) peptide accumulation and its production machinery are upregulated by TBI. Considering the clear link between chronic Aβ elevation and AD as well as tau pathology, the role(s) of Aβ in TBI is of high importance. ⋯ Our results show that the presence of the human form of Aβ did not exacerbate motor (Rotarod) and spatial learning/memory deficits (Morris water maze) post-injuries, while potentially reduced anxiety (Open Field) was observed. NEP and NEP2 deficiency also did not exacerbate these deficits post-injuries and was associated with protection from motor (NEP and NEP2) and spatial learning/memory deficits (NEP only). These data suggest that normally regulated expression of wild-type human APP/Aβ does not contribute to deficits acutely after TBI and may be protective at this stage of injury.
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Journal of neurotrauma · Mar 2021
Diffusion tensor imaging in contact and non-contact university-level sport athletes.
Subconcussive hits to the head and physical fitness both have been associated with alterations in white matter (WM) microstructure in partly overlapping areas of the brain. The aim of the present study was to determine whether WM damage associated with repeated exposure to subconcussive hits to the head in university level contact sports athletes is modulated by high levels of fitness. To this end, 72 students were recruited: 24 athletes practicing a varsity contact sport (A-CS), 24 athletes practicing a varsity non-contact sport (A-NCS), and 24 healthy non-athletes (NA). ⋯ The A-NCS also showed higher FA compared with NA in the anterior regions of the corpus callosum and the corticospinal tracts. No group difference was found between the A-CS and the NA groups. These data suggest that repeated subconcussive hits to the head lead to anisotropic changes in the WM that may counteract the beneficial effects associated with high levels of fitness.
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Journal of neurotrauma · Mar 2021
Multicenter Study Observational StudySatisfaction with life following mild traumatic brain injury: A TRACK-TBI Study.
Identifying the principal determinants of life satisfaction following mild TBI (mTBI) may inform efforts to improve subjective well-being in this population. We examined life satisfaction among participants in the Transforming Research and Clinical Knowledge in Traumatic Brain Injury (TRACK-TBI) study who presented with mTBI (Glasgow Coma Scale [GCS] score = 13-15; n = 1152). An L1-regularization path algorithm was used to select optimal sets of baseline and concurrent symptom measures for prediction of scores on the Satisfaction with Life Scale (SWLS) at 2 weeks and 3, 6, and 12 months post-injury. ⋯ Other post-TBI symptom domains and baseline socio-demographic, injury-related, and clinical characteristics did not emerge as robust predictors of SWLS scores during the year after mTBI. Efforts to improve satisfaction with life following mTBI may benefit from a focus on the detection and treatment of affective symptoms, pain, and insomnia. The results reinforce the need for tailoring of evidence-based treatments for these conditions to maximize efficacy in patients with mTBI.
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Journal of neurotrauma · Mar 2021
Neuropsychiatric Presentations due to Traumatic Brain Injury in cognitively normal older adults.
Neuropsychiatric symptoms (NPS) are common sequelae of traumatic brain injuries (TBI) among adults. However, little is known about NPS associated with a history of TBI in adults relative to adults without a history of TBI and to what extent NPS may be modulated by sex and other factors. Using the National Alzheimer's Coordinating Center Uniform Data Set, we examined the association between Neuropsychiatric Inventory-Questionnaire (NPI-Q) scores in cognitively normal older adults with and without a history of TBI. ⋯ Given that the aforementioned NPS are linked through different pathways, damage to any of them may cause an alteration in behavior. As well, NPS appear to be modulated by sex, with symptoms differing between males and females. Our research suggests future studies examining NPS sequelae of TBI should adjust for sex.
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Journal of neurotrauma · Mar 2021
Impaired Self-Awareness after Pediatric Traumatic Brain Injury: Protective Factor or Liability?
Children and adolescents with traumatic brain injury (TBI) can experience impaired self-awareness, or difficulty in accurately perceiving their personal abilities. This study aimed to identify the neuro-developmental and socio-environmental factors associated with self-awareness impairment and determine how self-awareness is associated with psychosocial functioning. Parents and their children age 8-16 years with TBI (n = 107, 65.4% male, mean [M] age = 12.66 years, standard deviation [SD] = 2.6 years) were consecutively recruited from an outpatient clinic over a 4-year period. ⋯ Poorer self-awareness was associated with worse parent-rated child adaptive functioning and emotional and behavioral problems. However, poorer self-awareness was also significantly associated with more positive self-concept and fewer symptoms of depression and anxiety as rated by children. Overall, impaired self-awareness seems to be both a liability and a benefit depending on the reporter (parent or child) and outcome of interest (adaptive function/behavior or self-concept/mood).