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Journal of Neurotrauma

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https://www.readbyqxmd.com/read/28701108/repetitive-mild-closed-head-injury-alters-protein-expression-and-dendritic-complexity-in-a-mouse-model
#1
Jessica Nicole Saykally, Whitney A Ratliff, Kristen Keeley, Chaim G Pick, Ronald F Mervis, Bruce A Citron
World-wide head injuries are a growing problem. In the United States alone, 1.7 million people suffer a head injury each year. While most of these injuries are mild, head injury sufferers still sustain symptoms that can have major medical and economical impacts. Moreover, repetitive mild head injuries, like those observed in active military personnel and athletes, have demonstrated a more severe and long-term set of consequences. In an effort to better understand the delayed pathological changes following multiple mild head injuries, we used a mouse model of mild closed head injury (with no motor deficits observed by rotarod testing) and measured dendritic complexity at 30 days after injury and potentially related factors up to 60 days post injury...
July 12, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28699412/pressure-autoregulation-measurement-techniques-in-adult-tbi-part-ii-a-scoping-review-of-continuous-methods
#2
Frederick Adam Zeiler, Joseph Donnelly, Leanne Calviello, Peter Smieleweski, David Menon, Marek Czosnyka
To perform systematically a scoping review of the literature on commonly described continuous autoregulation measurement techniques in adult TBI. The goal was to provide an overview of methodology and comprehensive reference library of the available literature for each technique. Five separate small systematic reviews were conducted for each of the continuous techniques: pressure reactivity index (PRx), laser Doppler flowmetry (LDF), near infrared spectroscopy (NIRS) techniques, brain tissue oxygen tension (PbtO2), and thermal diffusion (TD) techniques...
July 12, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28699381/prospective-assessment-of-acute-blood-markers-of-brain-injury-in-sport-related-concussion
#3
Timothy Meier, Lindsay D Nelson, Daniel L Huber, Jeff Bazarian, Ronald L Hayes, Michael McCrea
There is a pressing need to identify objective biomarkers for the assessment of sport-related concussion to reduce the reliance on clinical judgment for the management of these injuries. The goal of the current study was to prospectively establish the acute effects of sport-related concussion (SRC) on serum levels of S100B, GFAP, and UCH-L1. Collegiate and high school football players were enrolled and provided blood at preseason. Injured athletes participated in follow-up visits at approximately 6 and 24-48 hours following documented SRC (N=32)...
July 12, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28699371/minocycline-attenuates-high-mobility-group-box-1-translocation-microglial-activation-and-thalamic-neurodegeneration-after-traumatic-brain-injury-in-postnatal-day-17-rats
#4
Dennis William Simon, Rajesh K Aneja, Henry Alexander, Michael J Bell, Hulya Bayir, Patrick M Kochanek, Robert S B Clark
In response to cell injury the danger signal high mobility group box-1 (HMGB) is released, activating macrophages by binding pattern recognition receptors. We investigated the role of the anti-inflammatory drug minocycline in attenuating HMGB1 translocation, microglial activation, and neuronal injury in a rat model of pediatric traumatic brain injury (TBI). Postnatal day 17 Sprague-Dawley rats were subjected to moderate-severe controlled cortical impact (CCI). Animals were randomized to treatment with minocycline (90 mg/kg, i...
July 12, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28699368/impact-of-blood-pressure-lesion-level-and-physical-activity-on-aortic-augmentation-index-in-persons-with-sci
#5
Caitlyn G Katzelnick, Joseph P Weir, Nancy Chiaravalotti, Glenn Wylie, Trevor Dyson-Hudson, William A Bauman, Jill M Wecht
Individuals with chronic spinal cord injury (SCI) are at a heightened risk of cardiovascular disease (CVD) due to autonomic nervous system dysfunction, physical inactivity and increased inflammatory processes. Arterial stiffness (AS) is recognized as an independent risk factor for CVD and, specifically, pulse wave analysis (PWA) has proven to be a useful tool to predict and track structural arterial changes that reflect arteriosclerosis. The augmentation index (AI) can be used to estimate AS and is derived from the amplitude and timing of the blood pressure (BP) wave reflection in a peripheral artery...
July 12, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28683592/functional-outcomes-in-very-early-5-hours-and-early-5-24-hours-surgical-decompression-in-traumatic-cervical-spinal-cord-injury-analysis-of-neurological-improvement-from-the-austrian-spinal-cord-injury-study-ascis
#6
Georg Mattiassich, Maria Gollwitzer, Franz Gaderer, Martina Blocher, Michael Osti, Markus Lill, Reinhold Ortmaier, Thomas Haider, Wolfgang Hitzl, Herbert Resch, Stephanie Aschauer-Wallner
Our study aim was to assess the neurological outcomes of surgical decompression and stabilisation within 5 and 24 h after injury. We performed a multicentre, retrospective cohort study in adults aged 15-85 presenting cervical spinal cord injury (CSCI) at one of 6 Austrian trauma centres participating in the Austrian Spinal Cord Injury Study (ASCIS). Neurological outcomes were measured using the American Spinal Injury Association Impairment Scale (AIS) grade according to the international standards for neurological classification of spinal cord injury (ISNCSCI) form after at least 6 months of follow-up (FU)...
July 6, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28683591/the-ketone-metabolite-%C3%AE-hydroxybutyrate-attenuates-oxidative-stress-in-spinal-cord-injury-by-suppression-of-class-i-histone-deacetylases
#7
Qingan Zhu, Ganggang Kong, Zucheng Huang, Wei Ji, Xiaomeng Wang, Junhao Liu, Xiuhua Wu, Zhiping Huang, Rong Li
The ketone metabolite, β-hydroxybutyrate (βOHB), is reported neuroprotective after spinal cord injury (SCI) in rats, but the underlying mechanism remains unknown. The present study aims to investigate effects of βOHB on suppression of oxidative stress and inhibition of class I histone deacetylases (HDACs) in in-vivo and in-vitro models. Rats were fed with ketogenic diet (KD) or standard diet (SD) 3 weeks. A C5 hemi-contusion injury was applied to these animals on the 14th day of experiment, and spinal cord samples were harvested on the 1st, 3rd and 7th day after SCI, respectively...
July 6, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28683586/vitronectin-regulates-the-fibrinolytic-system-during-the-repair-of-cerebral-cortex-in-stab-wounded-mice
#8
Kei Hashimoto, Natsumi Ikeda, Mari Nakashima, Hiroko Ikeshima-Kataoka, Yasunori Miyamoto
Vitronectin (VN), one of the serum proteins, is known to be involved in the regulation of blood coagulation, fibrinolysis, and cell migration. It has been proposed that the regulation of fibrinolysis by VN promotes the blood brain barrier (BBB) recovery from brain injuries such as traumatic injury and subarachnoid hemorrhage. However, the effects of VN on fibrinolysis in the injured brain remain unclear. Here, we examined the effects of VN on the fibrinolytic system in the stab-wounded cerebral cortex of VN-knockout (KO) mice...
July 6, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28683585/pilot-findings-of-brain-displacements-and-deformations-during-roller-coaster-rides
#9
Calvin Kuo, Lyndia C Wu, Patrick P Ye, Kaveh Laksari, David Benjamin Camarillo, Ellen Kuhl
With 300 million riders annually, roller coasters are a popular recreational activity. Although the number of roller coaster injuries is relatively low, the precise effect of roller coaster rides on our brain remains unknown. Here we present the quantitative characterization of brain displacements and deformations during roller coaster rides. For two healthy adult male subjects, we recorded head accelerations during three representative rides, and, for comparison, during running and soccer headers. From the recordings, we simulated brain displacements and deformations using rigid body dynamics and finite element analyses...
July 6, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28665182/systemic-administration-of-exosomes-released-from-mesenchymal-stromal-cells-attenuates-apoptosis-inflammation-and-promotes-angiogenesis-after-contusion-spinal-cord-injury-in-rats
#10
Jiang-Hu Huang, Xiao-Ming Yin, Yang Xu, Chun-Cai Xu, Xi Lin, Fu-Biao Ye, Yong Cao, Fei-Yue Lin
Spinal cord injury (SCI) is one of the most common devastating injuries, which causes permanent disabilities such as paralysis and loss of movement or sensation. The precise pathogenic mechanisms of the disease remain unclear, and as of yet, there is no effective cure. Mesenchymal stem cells (MSCs) show promise as an effective therapy in the experimental models of SCI. MSCs secrete various factors which can modulate a hostile environment, which is called the paracrine effect. Among these paracrine molecules, exosome is considered to be the most valuable therapeutic factor...
June 30, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28665173/serial-assessment-of-gray-matter-abnormalities-following-sport-related-concussion
#11
Lezlie Espana, Ryan Lee, Josef Ling, Andreas Jeromin, Andrew Mayer, Timothy Meier
There is an urgent need to characterize the acute physiological effects of sport-related concussion (SRC). We investigated the effects of SRC on gray matter structure and diffusion metrics in collegiate athletes at 1.64 days (T1; n=33), 8.33 days (T2; n=30), and 32.15 days (T3; n=36) post-concussion, with healthy collegiate contact-sport athletes serving as controls (HA; n=46). Plasma levels of GFAP were assessed in a subset of athletes. We hypothesized that acute SRC would be associated with increased fractional anisotropy (FA), decreased mean diffusivity (MD), and increased GFAP relative to non-injured HA, without acute differences in gray matter volume or cortical thickness...
June 30, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28665166/mild-traumatic-brain-injury-reduces-spine-density-of-projection-neurons-in-the-medial-prefrontal-cortex-and-impairs-extinction-of-contextual-fear-memory
#12
Jing Zhao, Jonathan C Huynh, Michael J Hylin, John OMalley, Alec I Perez, Anthony N Moore, Pramod K Dash
Epidemiology studies have found that a comorbidity exists between traumatic brain injury (TBI) and stress-related disorders. However, the anatomical and cellular bases for this association is poorly understood. An inability to extinguish the memory of a traumatic event lies at the core of many stress-related disorders. Experimental studies have shown that the medial prefrontal cortex (mPFC), especially the infralimbic (IL) cortex, is required for extinction and for storing the memory of extinction. The output from the central nucleus of amygdala projects to lateral hypothalamus, paraventricular nucleus and central grey to regulate heart rate, stress hormone release and freezing behavior, respectively...
June 30, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28467736/spinal-transection-alters-external-urethral-sphincter-activity-during-spontaneous-voiding-in-freely-moving-rats
#13
Brandon K LaPallo, Jonathan R Wolpaw, Xiang Yang Chen, Jonathan S Carp
The rat is a commonly used model for the study of lower urinary tract function before and after spinal cord injury. We have previously reported that in unanesthetized freely moving rats, although phasic external urethral sphincter (EUS) activity (bursting) is most common during micturition, productive voiding can occur in the absence of bursting, which differs from results seen in anesthetized or unanesthetized restrained animals. The purpose of the present study was to characterize EUS behavior in unanesthetized, freely moving rats before and after mid-thoracic (T8) or thoraco-lumbar (T13-L1) spinal transection to determine how EUS behavior after spinal cord injury differs from that seen in anesthetized or unanesthetized restrained rats...
June 30, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28661222/expression-of-caspase-signaling-components-in-the-outer-membranes-of-chronic-subdural-hematomas
#14
Koji Osuka, Yasuo Watanabe, Nobuteru Usuda, Masahiro Aoyama, Kenichiro Iwami, Mikinobu Takeuchi, Takeya Watabe, Masakazu Takayasu
Chronic subdural hematoma (CSDH) is fundamentally treatable through surgery, although it recurs in some cases. We have observed several cases of spontaneous resolution of CSDH outer membranes, including in trabecular CSDH, after trepanation surgery. In this study, we examined the expression of molecules involved in caspase signaling in CSDH outer membranes. Eight patients whose outer membranes were successfully obtained during trepanation surgery were included in this study. The expression of Fas; Fas-associated death domain (FADD); tumor necrosis factor receptor type 1-associated death domain (TRADD); receptor-interacting protein (RIP); caspases 3, 7, 8 and 9; poly-(ADP-ribose) polymerase (PARP); DNA fragmentation factor 45 (DFF45) and β-actin was examined by Western blot analysis...
June 29, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28548606/anatomical-recruitment-of-spinal-v2a-interneurons-into-phrenic-motor-circuitry-after-high-cervical-spinal-cord-injury
#15
Lyandysha V Zholudeva, Jordyn S Karliner, Kimberly J Dougherty, Michael A Lane
More than half of all spinal cord injuries (SCIs) occur at the cervical level, often resulting in impaired respiration. Despite this devastating outcome, there is substantial evidence for endogenous neuroplasticity after cervical SCI. Spinal interneurons are widely recognized as being an essential anatomical component of this plasticity by contributing to novel neuronal pathways that can result in functional improvement. The identity of spinal interneurons involved with respiratory plasticity post-SCI, however, has remained largely unknown...
June 29, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28351209/effects-of-multiple-injection-of-bone-marrow-mononuclear-cells-on-spinal-cord-injury-of-rats
#16
Kenji Kanekiyo, Norihiko Nakano, Tamami Homma, Yoshihiro Yamada, Masahiro Tamachi, Yoshihisa Suzuki, Masanori Fukushima, Fukuki Saito, Chizuka Ide
The effects of multiple injection of bone marrow mononuclear cells (BMNCs) on spinal cord injury (SCI) were compared with those of single injection in rats. BMNCs separated by density-gradient centrifugation from a bone marrow perfusate were injected three times (once weekly) through the cerebrospinal fluid (CSF) via the fourth ventricle, and the locomotor improvement and tissue recovery, including axonal regeneration, were compared with those of single injection. While the single-injection group showed a steep elevation of the Basso-Beattie-Bresnahan (BBB) score 1 week after transplantation, the multiple-injection group maintained a similar steep elevation for 2 weeks after transplantation, and the BBB scores of the multiple-injection group remained thereafter at a level approximately 2-3 points higher than those of the single-injection group until the end of the experiment...
June 29, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28657491/novel-noninvasive-method-of-cerebrovascular-blood-volume-assessment-using-brain-bioimpedance
#17
Mohamad Hakam Tiba, Brendan M McCracken, Sardar Ansari, Ashwin Belle, Brandon C Cummings, Venkatakrishna Rajajee, Parag G Patil, Hasan B Alam, Kevin R Ward
Cerebro-vascular autoregulation (CAR) is the ability of vessels to modulate their tone in response to changes in pressure. CAR, as an auto-protective mechanism is critical in preventing secondary brain injury post trauma. Monitoring of changes in cerebral blood volume might be valuable in evaluating CAR and response to various therapies. In this study, we utilized an ocular-brain bioimpedance interface to assess real time changes in cerebral blood volume in response to a number of physiologic challenges. We hypothesize that changes in brain bioimpedance (dz) would track changes in cerebral blood volume...
June 28, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28657487/delayed-spinal-cord-brachial-plexus-reconnection-after-c7-ventral-root-avulsion-the-effect-of-reinnervating-motoneurons-rescued-by-riluzole-treatment
#18
Balázs Gloviczki, Dénes G Török, Gábor Márton, László Gál, Tamás Bodzay, Sándor Pintér, Antal Nógrádi
Ventral root avulsion induces dramatic loss of the affected spinal cord motoneurons. The neuroprotective effect of riluzole has been previously proven on the injured motoneurons: the vast majority of them can be rescued even when they have no possibility to regenerate their axons. In this study the number of injured motoneurons rescued by riluzole treatment and their capacity to reinnervate the denervated forelimb muscles was investigated. Surgical reconnection with a peripheral nerve graft between the affected spinal cord segment and the C7 spinal nerve was established immediately or with 1- and 3-week delay after avulsion...
June 28, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28657432/accelerated-changes-in-cortical-thickness-measurements-with-age-in-military-service-members-with-traumatic-brain-injury
#19
Ricky R Savjani, Brian A Taylor, Laura Acion, Elisabeth A Wilde, Ricardo Jorge
Finding objective and quantifiable imaging markers of mild traumatic brain injury (TBI) has proven challenging, especially in the military population. Changes in cortical thickness after injury have been reported in animals and in humans, but it is unclear how these alterations manifest in the chronic phase and is difficult to accurately characterize with imaging. Here, we used cortical thickness measures derived from Advanced Normalization Tools (ANTs) to predict a continuous demographic variable: age. We trained four different regression models (linear regression, support vector regression, Gaussian process regression, and random forests) to predict age from healthy control brains from publicly available datasets (n = 762)...
June 28, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28486051/characterization-of-differences-in-functional-connectivity-associated-with-close-range-blast-exposure
#20
Meghan E Robinson, Dustin C Clark, William P Milberg, Regina E McGlinchey, David H Salat
Despite the prevalence of blast injuries in recent overseas conflicts, knowledge of their impact on neural health is lacking. We have recently published work demonstrating differences in functional magnetic resonance imaging (fMRI) connectivity that were specific to close-range blast exposure (CBE), as opposed to other prevalent military-related factors. Here, we replicate this finding in an independent sample of 135 veterans, again finding that CBE, regardless of concussion, is predictive of persistent changes in brain physiology...
June 28, 2017: Journal of Neurotrauma
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