Abstract:
:Surviving motoneurons undergo dendritic atrophy after spinal cord injury (SCI), suggesting an important therapeutic target for neuroprotective strategies to improve recovery of function after SCI. Our previous studies showed that phospholipase A2 (PLA2) may play an important role in the pathogenesis of SCI. In the present study, we investigated whether blocking cPLA2 pharmacologically with arachidonyl trifluoromethyl ketone (ATK) or genetically using cPLA2 knockout (KO) mice attenuates motoneuron atrophy following SCI. C57BL/6 mice received either sham or contusive SCI at the T10 level. At 30 min after SCI, mice were treated with ATK or vehicle. Four weeks later, motoneurons innervating the vastus lateralis muscle of the quadriceps were labeled with cholera toxin-conjugated horseradish peroxidase, and dendritic arbors were reconstructed in three dimensions. Soma volume, motoneuron number, lesion volume, and tissue sparing were also assessed, as were muscle weight, fiber cross-sectional area, and motor endplate size and density. ATK administration reduced percent lesion volume and increased percent volume of spared white matter compared to the vehicle-treated control animals. SCI with or without ATK treatment had no effect on the number or soma volume of quadriceps motoneurons. However, SCI resulted in a decrease in dendritic length of quadriceps motoneurons in untreated animals, and this decrease was completely prevented by treatment with ATK. Similarly, the vastus lateralis muscle weights of untreated SCI animals were smaller than those of sham-surgery controls, and these reductions were prevented by ATK treatment. No effects on fiber cross-sectional areas, motor endplate area or density were observed across treatment groups. Remarkably, genetically deleting cPLA2 in cPLA2 KO mice attenuated dendritic atrophy after SCI. These findings suggest that after SCI, cord tissue damage and regressive changes in motoneuron and muscle morphology can be reduced by inhibition of cPLA2, further supporting a role for cPLA2 as a neurotherapeutic target for SCI treatment.
journal_name
J Neurotraumajournal_title
Journal of neurotraumaauthors
Liu NK,Byers JS,Lam T,Lu QB,Sengelaub DR,Xu XMdoi
10.1089/neu.2014.3690subject
Has Abstractpub_date
2014-11-11 00:00:00eissn
0897-7151issn
1557-9042pub_type
杂志文章abstract::Lesions in specific areas of the rat motor cortex generate deficits related to fine movement performance affecting the forelimb. We have previously shown that transplants of embryonic frontal cortex ameliorate these motor deficits. Amelioration has been associated with a functional integration of the transplant due to...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2008.0702
更新日期:2009-09-01 00:00:00
abstract::Injured neurons in the mammalian central nervous system (CNS) do not normally regenerate their axons after injury. Neurotrauma to the CNS usually results in axonal damage and subsequent loss of communication between neuronal networks, causing long-term functional deficits. For CNS regeneration, repair strategies need ...
journal_title:Journal of neurotrauma
pub_type: 杂志文章,评审
doi:10.1089/neu.2006.23.468
更新日期:2006-03-01 00:00:00
abstract::Using diffusion tensor imaging (DTI), we assessed the relationship of white matter integrity and performance on the Boston Naming Test (BNT) in a group of retired professional football players and a control group. We examined correlations between fractional anisotropy (FA) and mean diffusivity (MD) with BNT T-scores i...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2016.4446
更新日期:2017-01-15 00:00:00
abstract::Neuropsychological studies in electrical injury patients have reported deficits in attention, learning, and working memory, but the neural substrates of these deficits remain poorly characterized. In this study we sought to examine whether electrical injury subjects demonstrate abnormal patterns of brain activation du...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2008.0867
更新日期:2009-10-01 00:00:00
abstract::Acute pain is a common symptom experienced after spinal cord injury (SCI). The presence of this pain calls for treatment with analgesics, such as buprenorphine. However, there are concerns that the drug may exert other effects besides alleviation of pain. Among those reported are in vitro changes in gene expression, a...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2007.0502
更新日期:2009-10-01 00:00:00
abstract::Increasing evidence indicates that post-traumatic stress disorder (PTSD) may develop following traumatic brain injury (TBI), despite most patients having no conscious memory of their accident. This prospective study examined the frequency, timing of onset, symptom profile, and trajectory of PTSD and its psychiatric co...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2015.3992
更新日期:2016-05-01 00:00:00
abstract::Recovery of fine motor skills after traumatic brain injury (TBI) is variable, with some patients showing progressive improvements over time while others show poor recovery. We therefore studied possible cellular mechanisms accompanying the recovery process in a non-human primate model system, in which the lateral fron...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2009.0966
更新日期:2010-03-01 00:00:00
abstract::Traumatic brain injury (TBI) is an established risk factor for neurodegenerative disorders and dementias. Epigenetic modifications, such as DNA methylation, may alter the expression of genes without altering the DNA sequence in response to environmental factors. We hypothesized that DNA methylation changes may occur i...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2020.7283
更新日期:2021-01-08 00:00:00
abstract::Reactive oxygen species have been implicated in the pathogenesis of hypoxic-ischemic injury. It has been shown previously that treating an animal with N-acetyl-L-cysteine (NAC), a scavenger of free radicals, significantly minimizes hypoxic-ischemic-induced brain injury in various acute models. Using a subacute swine m...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2010.1325
更新日期:2010-10-01 00:00:00
abstract::Changes in the modes of cerebrovascular pressure transmission during cerebral vasodilation induced by hypercapnic challenge were examined as a means for developing the basis for a bedside method to evaluate regulation of cerebral blood flow. Recordings of arterial blood pressure (ABP) and intracranial pressure (ICP) o...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2006.0129
更新日期:2007-03-01 00:00:00
abstract::Spinal cord injury (SCI) launches a complex cascade of events that leads to progressive damage and loss of function. Compromise of plasma membrane integrity due to the mechanical impact is an acute event that may contribute to cellular dysfunction. Therefore, the objective of this study was to better understand the ex...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2008.0523
更新日期:2009-04-01 00:00:00
abstract::Experimental traumatic brain injury (TBI) initiates massive disturbances in Ca2+ concentrations in the brain that may contribute to neuronal damage. Intracellular Ca2+ may be elevated via influx through voltage-operated cation channels, ligand-gated ionotropic channels, and store-operated cation channels (SOCs). In th...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2000.17.83
更新日期:2000-01-01 00:00:00
abstract::The International Mission on Prognosis and Analysis of Clinical Trials in Traumatic Brain Injury (IMPACT) and Corticoid Randomisation After Significant Head injury (CRASH) prognostic models predict functional outcome after moderate and severe traumatic brain injury (TBI). We aimed to assess their performance in a cont...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2020.7300
更新日期:2020-12-14 00:00:00
abstract::Death of Central Nervous System (CNS) neurons following traumatic brain injury (TBI) is a complex process arising from a combination of factors, many of which are still unknown. It has been found that inhibition of transient receptor potential (TRP) channels constitutes an effective strategy for preventing death of CN...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2012.2575
更新日期:2012-12-10 00:00:00
abstract::The purpose of this study was to determine the relationship between endothelin-1 (ET-1), a prominent vasoactive agent, and the breakdown of the blood-spinal cord barrier along the axis of the cord after a moderate spinal cord injury. In the first study rats (n = 10) were euthanized 24 h after spinal cord injury and co...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.1995.12.257
更新日期:1995-06-01 00:00:00
abstract::Previous studies convincingly suggest that the biopsychosocial fear-avoidance model (FAM) may be of added value in understanding chronic disability after traumatic brain injury (TBI). In this model, persistent symptoms occur as a result of catastrophizing and fear-avoidance regarding initial symptoms, leading to depre...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2020.7135
更新日期:2020-12-15 00:00:00
abstract::Diffusion tensor imaging (DTI) has demonstrated success as a biomarker of spinal cord injury (SCI) severity as shown from numerous pre-clinical studies. However, artifacts from stabilization hardware at the lesion have precluded its use for longitudinal assessments. Previous research has documented ex vivo diffusion c...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2018.5964
更新日期:2019-05-01 00:00:00
abstract::Arginine-vasopressin (AVP) V1 receptors are known to mediate brain edema formation after traumatic brain injury (TBI). So far, however, AVP V1 receptors were only inhibited by genetic deletion or prior to trauma. Therefore, the current study aimed to determine the therapeutic window of AVP V1 receptor antagonization a...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2016.4514
更新日期:2017-04-01 00:00:00
abstract::Fluid percussion (FP) brain injury causes spatial memory dysfunction in rats regardless of injury location (midline vs. lateral). Standard histological analysis of the injured brains shows hippocampal neuronal loss after lateral, but not midline FP injury. We have used the optical volume fractionator (OVF) stereologic...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/089771503770195786
更新日期:2003-10-01 00:00:00
abstract::To examine the mechanism of the increase in cerebral blood flow induced by L-arginine administration after traumatic brain injury, the cerebral hemodynamic effects of L-arginine, D-arginine, and the free radical scavengers superoxide dismutase (SOD) and catalase were compared in the controlled cortical impact injury m...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/08977150360517209
更新日期:2003-01-01 00:00:00
abstract::Experimental enhancement of noradrenergic activity following traumatic brain injury (TBI) accelerates behavioral recovery if performed at a time when brain norepinephrine (NE) turnover is decreased. But, since NE turnover is markedely increased immediately after TBI, the present study was undertaken to evaluate the ef...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.1997.14.43
更新日期:1997-01-01 00:00:00
abstract::We measured quantitative cortical mantle cerebral blood flow (CBF) by stable xenon computed tomography (CT) within the first 12 h after severe traumatic brain injury (TBI) to determine whether neurologic outcome can be predicted by CBF stratification early after injury. Stable xenon CT was used for quantitative measur...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2011.2147
更新日期:2012-03-20 00:00:00
abstract::The horizontal ladder task is an established method to assess skilled locomotor recovery after neurological dysfunction. Walking speed is often used as a standardized measure in locomotor assessment of overground walking in human and pre-clinical studies, but the assessment of walking speed is typically ignored during...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2018.6152
更新日期:2019-09-15 00:00:00
abstract::Predicting outcome after pediatric traumatic brain injury (TBI) is important for providing information to families and prescribing rehabilitation services. Previously published studies evaluating the ability of serum biomarkers to predict outcome after pediatric TBI have focused on three markers: neuron-specific enola...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2011.1989
更新日期:2012-01-01 00:00:00
abstract::Although chronic sleepiness is common after head trauma, the cause remains unclear. Transcranial magnetic stimulation (TMS) represents a useful complementary approach in the study of sleep pathophysiology. We aimed to determine in this study whether post-traumatic sleep-wake disturbances (SWD) are associated with chan...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2010.1748
更新日期:2011-07-01 00:00:00
abstract::Transient receptor potential vanilloid 1 (TRPV1) is expressed widely in the central nervous system and is activated by various stimuli. Inhibiting TRPV1 has neuroprotective effects in cerebral ischemia. The role of inhibiting TRPV1 to maintain blood-brain barrier (BBB) integrity after traumatic brain injury (TBI) rema...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2018.5942
更新日期:2019-04-15 00:00:00
abstract::The objective of this study was to determine whether clinically significant ocular trauma can be induced by a survivable isolated primary blast using a live animal model. Both eyes of 18 Dutch Belted rabbits were exposed to various survivable low-level blast overpressures in a large-scale shock tube simulating a prima...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2015.4022
更新日期:2016-07-01 00:00:00
abstract::The Glasgow Coma Scale (GCS) was introduced 40 years ago and has received world-wide acceptance. The GCS rates eye, motor, and verbal responses to assess the level of consciousness. Concerns have been expressed with regard to reliability and consistency of assessments. We considered that lack of standardization in app...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2014.3843
更新日期:2016-01-01 00:00:00
abstract::Functional recovery is markedly restricted following traumatic brain injury (TBI), partly due to myelin-associated inhibitors including Nogo-A, myelin-associated glycoprotein (MAG) and oligodendrocyte myelin glycoprotein (OMgp), that all bind to the Nogo-66 receptor-1 (NgR1). In previous studies, pharmacological neutr...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2009.1255
更新日期:2010-07-01 00:00:00
abstract::Traumatic brain injury (TBI) causes damage to the hypothalamo-hypophyseal axis, leading to endocrine dysregulation in up to 40% of TBI patients. Hence, there is an urgent need to identify non-invasive biomarkers for TBI-associated hypothalamo-hypophyseal pathology. Sushi repeat-containing protein X-linked 2 (SRPX2) is...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2019.6739
更新日期:2020-04-01 00:00:00