Abstract:
:This study characterized the effects of fluid percussion brain injury (FPI) on angiotensin II (AII)-induced cerebral vasodilation, determined the role of prostaglandins in such changes and evaluated the contribution of two subtypes of AII receptors (AT(1) and AT(2)) to the effects of AII on cerebrovascular regulation. Topical AII (10(-8), 10(-6), 10(-4) M) elicited vasodilation, which was attenuated by FPI (10 +/- 1; 18 +/- 2; 27 +/- 1% vs. 2 +/- 1; 4 +/- 1; 7 +/- 1%). Such changes in diameter were associated with increases in CSF 6-keto-PGF(1alpha), the stable breakdown product of PGI(2) (1.5 +/- 0.1; 2.1 +/- 0.1; 4.0 +/- 0.3 fold) and TXB(2), the stable breakdown product of TXA(2) (1.2 +/- 0.1; 1.4 +/- 0.1; 1.6 +/- 0.1 fold). However, after FPI, increases in 6-keto PGF(1alpha) were blocked (1.0 +/- 0.1; 1.0 +/- 0.1; 1.1 +/- 0.1 fold) whereas TXB(2) release was enhanced (1.5 +/- 0.1; 1.8 +/- 0.1; 1.9 +/- 0.1 fold). Pretreatment with the cyclooxygenase inhibitor indomethacin (5 mg/kg i.v.) in FPI animals partially protected AII vasodilation (8 +/- 1; 14 +/- 2; 19 +/- 3%). CGP 42112A, a putative AT(2) agonist, elicited vasodilation, which was also blunted by FPI. Such dilation was not associated with CSF prostaglandin changes, and indomethacin did not protect responses altered by FPI. Vasodilatation caused by low concentrations of AII was blunted by an AT(1) antagonist ZD 7155 but unchanged by an AT(2) antagonist PD 123,319. The high AII concentration produced dilation that was blunted by both antagonists. These data show that FPI impairs AII-mediated vasodilation. These data suggest that FPI causes these changes via alteration in an AT(1)-mediated production of prostaglandins. These data additionally suggest that FPI induced impairment of AT(2) mediated vasodilation is independent of an altered production of prostaglandins.
journal_name
J Neurotraumajournal_title
Journal of neurotraumaauthors
Baranov D,Armstead WMdoi
10.1089/089771502320914688subject
Has Abstractpub_date
2002-11-01 00:00:00pages
1457-66issue
11eissn
0897-7151issn
1557-9042journal_volume
19pub_type
杂志文章abstract::Physician prescribed rest after traumatic brain injury (TBI) is both commonplace and an increasingly scrutinized approach to TBI treatment. Although this practice remains a standard of patient care for TBI, research of patient outcomes reveals little to no benefit of prescribed rest after TBI, and in some cases prolon...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2020.7389
更新日期:2021-01-20 00:00:00
abstract::Remarkable advances have been made in pharmacologic treatments of acute and chronic spinal cord injury. The recent National Acute Spinal Cord Injury Study (NASCIS) showed that very high dose methylprednisolone given within 8 hr after injury improves neurologic recovery. The mechanism is believed to be inhibition of li...
journal_title:Journal of neurotrauma
pub_type: 杂志文章,评审
doi:
更新日期:1992-03-01 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::Anatomical studies of spinal cord injury (SCI) using magnetic resonance imaging (MRI) report diverging observations, from "no changes" to "tissue atrophy in motor and non-motor regions." These discrepancies among studies can be attributed to heterogeneity in extent, level, and post-injury duration observed within the ...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2018.6040
更新日期:2019-06-15 00:00:00
abstract::It is now generally accepted that excitotoxic cell death involves bioenergetic failure resulting from the cycling of Ca2+ and the generation of reactive oxygen species (ROS) by mitochondria. Both Ca2+ cycling and ROS formation by mitochondria are dependent on the mitochondrial membrane potential (Deltapsi(m)) that res...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2005.22.1142
更新日期:2005-10-01 00:00:00
abstract::Multipotent neural progenitors and stem cells may integrate appropriately into the developing and degenerating central nervous system. They may also be effective in the replacement of genes, cells, and nondiffusible factors in either a widespread or a more circumscribed manner, depending on the therapeutic demands of ...
journal_title:Journal of neurotrauma
pub_type: 杂志文章,评审
doi:10.1089/neu.1999.16.675
更新日期:1999-08-01 00:00:00
abstract::A critical component for accelerating the clinical uptake of research data in the area of pediatric concussion or mild traumatic brain injury (MTBI) pertains to the establishment and utilization of common databases. The objective of the first phase of our CanPedCDE initiative was to agree upon pediatric common data el...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2018.5887
更新日期:2018-08-15 00:00:00
abstract::Accurate localization of cerebrospinal fluid (CSF) fistula in a patient with CSF rhinorrhea is challenging and often involves multiple imaging studies with associated expense and patient discomfort. Intrathecal contrast-enhanced computed tomography (CT) and unenhanced magnetic resonance (MR) cisternography using const...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2007.0326
更新日期:2007-10-01 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::The Basso, Bresnahan and Beattie (BBB) locomotor scale has not been tested to evaluate functional consequences of peripheral nerve lesions. Alternative methods to evaluate animal functional recovery after sciatic nerve injury are desirable. Male Wistar rats had a right sciatic nerve segment exposed and were divided in...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/089771504774129955
更新日期:2004-05-01 00:00:00
abstract::In a new, reproducible model of rodent focal cortical injury, we have shown that in the absence of early traumatic disruption of the microvasculature and subsequent hemorrhage, delayed perivascular protein leakage and polymorphonuclear leukocyte infiltration of the injured cortex occur. In this study we employed a sen...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.1996.13.465
更新日期:1996-08-01 00:00:00
abstract::The aim of this systematic review was to critically evaluate the evidence on interventions for depression following traumatic brain injury (TBI) and provide recommendations for clinical practice and future research. We reviewed pharmacological, other biological, psychotherapeutic, and rehabilitation interventions for ...
journal_title:Journal of neurotrauma
pub_type: 杂志文章,评审
doi:10.1089/neu.2009.1091
更新日期:2009-12-01 00:00:00
abstract::To compare the effect of levodopa-carbidopa on the visual outcome of patients with indirect traumatic optic neuropathy (ITON), this randomized, double-blind, placebo-controlled study was conducted on 32 patients with ITON within 6 days after trauma. Patients underwent a complete ocular examination, pattern visual evok...
journal_title:Journal of neurotrauma
pub_type: 杂志文章,随机对照试验
doi:10.1089/neu.2010.1362
更新日期:2010-10-01 00:00:00
abstract::Although mechanisms involved in progression of cell death in spinal cord injury (SCI) have been studied extensively, few are clear targets for translation to clinical application. One of the best-understood mechanisms of cell survival in SCI is phosphatidylinositol-3-kinase (PI3K)/Akt and associated downstream signali...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2018.6294
更新日期:2019-09-15 00:00:00
abstract::Microarray-based transcriptional profiling was used to determine the effect of progesterone in the cortical contusion (CCI) model. Gene ontology (GO) analysis then evaluated the effect of dose on relevant biological pathways. Treatment (vehicle, progesterone 10 mg/kg or 20 mg/kg given i.p.) was started 4 h post-injury...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2011.1911
更新日期:2011-09-01 00:00:00
abstract::Neuroendocrine disturbances are common after traumatic brain injury (TBI) and aneurysmal subarachnoid hemorrhage (SAH), but only a few data exist on long-term anterior pituitary deficiencies after brain injury. We present data from the Structured Data Assessment of Hypopituitarism after TBI and SAH, a multi-center stu...
journal_title:Journal of neurotrauma
pub_type: 杂志文章,多中心研究
doi:10.1089/neu.2015.4109
更新日期:2016-08-15 00:00:00
abstract::Posttraumatic amnesia (PTA) is a common symptom following traumatic brain injury. Although this transient memory deficit implies specific impairment of higher brain function, the actual pathophysiology of PTA is not well understood. The aim of this study was to assess regional cerebral hemodynamics with perfusion comp...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2010.1395
更新日期:2010-12-01 00:00:00
abstract::Traumatic brain injuries (TBI) sustained in combat frequently co-occur with significant bodily injuries. Intuitively, more extensive bodily injuries might be associated with increased symptom reporting. In 2012, however, French et al. demonstrated an inverse relation between bodily injury severity and symptom reportin...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2014.3401
更新日期:2014-10-01 00:00:00
abstract::Although mild therapeutic hypothermia is an effective neuroprotective strategy for cardiac arrest/resuscitated patients, and asphyxic newborns, recent randomized controlled trials (RCTs) have equally shown good neurological outcome between targeted temperature management at 33 °C versus 36 °C, and have not shown consi...
journal_title:Journal of neurotrauma
pub_type: 杂志文章,随机对照试验
doi:10.1089/neu.2013.3197
更新日期:2015-04-01 00:00:00
abstract::Many patients with mild traumatic brain injury (MTBI) concurrently sustain extracranial injuries; however, little is known about the impact of these additional injuries on outcome. We assessed the impact of additional injuries on the severity of postconcussional symptoms (PCS) and functional outcome 6 months post-inju...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2006.23.1561
更新日期:2006-10-01 00:00:00
abstract::The inflammatory response to moderate-severe controlled cortical impact (CCI) in adult male mice has been shown to exhibit greater glial activation compared with age-matched female mice. However, the relative contributions of resident microglia and infiltrating peripheral myeloid cells to this sexually dimorphic neuro...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2018.6019
更新日期:2019-04-01 00:00:00
abstract::Recent calls have been made for the inclusion of health-related quality of life (HRQoL) in traumatic brain injury studies. This study reports the impact of TBI on traditional measures (general health, depression, social isolation, labor force participation), self-assessed health function status using the SF-36 version...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2008.0735
更新日期:2009-10-01 00:00:00
abstract::Heterogeneity within brain injury presents a challenge to the development of informative molecular diagnostics. Recent studies show progress, particularly in cerebrospinal fluid, with biomarker assays targeting one or a few structural proteins. Protein-based assays in peripheral fluids, however, have been more challen...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2013.3116
更新日期:2014-04-15 00:00:00
abstract::The expression of the heat shock proteins hsp27 and hsp70 was examined in the spinal cord and sciatic nerves of developing rats. Using immunohistochemistry, we found that hsp27 is present in many motoneurones at birth. With development, the intensity of staining increases, reaching adult levels by 21 days, when all sc...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/089771502753754127
更新日期:2002-05-01 00:00:00
abstract::Striking gender differences have been reported in the pathophysiology and outcome of acute neurological injury. Greater neuroprotection in females versus males may be due, in part, to direct and indirect sex hormone-mediated antioxidant mechanisms. Progesterone administration decreases brain levels of F(2)-isoprostane...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/089771504772695896
更新日期:2004-01-01 00:00:00
abstract::Proton magnetic resonance spectroscopy (1H-MRS) offers a unique insight into brain cellular metabolism following traumatic brain injury (TBI). The aim of the present study was to assess change in neurometabolite markers of brain injury during the recovery period following TBI. We studied 19 TBI patients at 1.5, 3, and...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/089771500415382
更新日期:2000-08-01 00:00:00
abstract::A systematic review of the literature was performed to address pertinent clinical questions regarding deep vein thrombosis (DVT) prophylaxis in the setting of acute spinal cord injury (SCI). Deep vein thromboses are a common occurrence following SCI. Administration of low-molecular-weight heparin (LMWH) within 72 h of...
journal_title:Journal of neurotrauma
pub_type: 杂志文章,评审
doi:10.1089/neu.2009.1155-A
更新日期:2011-08-01 00:00:00
abstract::Return to living at home is an important patient-reported outcome following traumatic spinal cord injury (tSCI). Specialized inpatient rehabilitation assists such patients in maximizing function and independence. Our project aim was to describe those patients receiving specialized rehabilitation after tSCI in Canada, ...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2016.4930
更新日期:2017-10-15 00:00:00
abstract::Gap junctions are conductive channels formed by membrane proteins termed connexins (Cx), which permit the intercellular exchange of metabolites, ions, and small molecules. Junctional permeability is regulated by pH, membrane potential, and intracellular secondary messengers. The purpose of this study was to elucidate ...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2009.1234
更新日期:2010-07-01 00:00:00
abstract::Acute changes in cerebral perfusion and metabolism after subarachnoid hemorrhage (SAH) have been shown to contribute significantly to acute brain injury. The purpose of this study was to examine the effects of moderate hypothermia on the acute changes after massive experimental SAH as evaluated by diffusion-weighted i...
journal_title:Journal of neurotrauma
pub_type: 杂志文章
doi:10.1089/neu.2007.0443
更新日期:2008-07-01 00:00:00