The Structural and Molecular Basis of Blast-Induced Vascular Injury
The Structural and Molecular Basis of Blast-Induced Vascular Injury
批准号:
10455436
负责人:
Gregory A. Elder
金额:
$0.0万
依托单位国家:
美国
项目类别:
财政年份:
2019
资助国家:
美国
项目状态:
已结题
起止时间:
2019-04-01 至 2023-03-31
关键词:
AcuteAffectAfghanistanAlzheimer&aposs disease modelAreaAstrocytesBasement membraneBehaviorBehavioralBiochemical MarkersBiotinBlast InjuriesBlood - brain barrier anatomyBlood VesselsBrain InjuriesCerebrovascular systemCerebrumChronicChronic PhaseCognitiveComplementComputer softwareConflict (Psychology)DataDextransElectron MicroscopyEvolutionGlial Fibrillary Acidic ProteinHistologicHourImmunohistochemistryInjuryIntermediate Filament ProteinsIraqLabelLengthMass Spectrum AnalysisMental HealthModelingMolecularMorbidity - disease rateNerveNeurofilament-HNeuronsPathologyPericytesPost-Traumatic Stress DisordersPreparationProcessPropertyProteinsProteomicsRattusResearchResearch PersonnelRoleScanningSmooth MuscleSurfaceTechniquesTestingTimeTraumatic Brain InjuryVeteransWestern Blottingantagonistaquaporin 4attenuationbehavior testbehavioral phenotypingblast exposuredensityimprovedmetabotropic glutamate receptor 2microCTmild traumatic brain injurymilitary servicemortalitymouse modelneurofilamentneurovascularneurovascular unitnovelnovel therapeutic interventionreceptorstress related disordertraittreatment strategyvascular injury
中文摘要
近年来,外伤性脑损伤已成为儿童死亡率和致残率的主要原因。
伊拉克和阿富汗的冲突层出不穷。人们对伊拉克和阿富汗两国在解决这一长期问题中所扮演的角色存在很多担忧。
认知能力和行为能力的影响是指在服兵役期间或服兵役后的一段时间内不会发生精神疾病。大多数人的伤害发生在军队。
最近发生的几起冲突都是由于爆炸和暴露造成的轻微脑损伤(MTBIS)。
作为爆炸和受伤的一个重要组成部分,它已经得到了很好的确立。它确实是在爆炸和受伤的最低条件下发生的。
在这项研究中的动物模型中,在组织学水平上暴露于大脑血管系统似乎是可能的。
选择性地变得脆弱。通过使用微型计算机断层扫描技术(CT)扫描,我们发现了爆炸。
导致大脑和血管系统广泛的蛋白质组学研究依赖于分离的蛋白质组。
微血管制剂是在受伤后两个月内获得的,其中一个变化最大。
经质谱仪(MS)鉴定的蛋白质可能是胶质、纤维和酸性蛋白质组分(GFAP)。
这一发现也得到了西方媒体的证实,这一发现也得到了西方媒体的证实。
隔离的微血管手术准备。从GFAP的损失来看,似乎很可能表明爆炸和受伤后的创伤。
星形细胞足部逐渐与脑血管脱离,免疫组织化学染色显示。
分离的微血管准备支持了这一猜测。有趣的是,这是第一批9种蛋白质中的一种。
经MS和其他几种蛋白质鉴定,这些蛋白质是神经元和中间微丝的蛋白质,包括蛋白质。
神经细丝和重链蛋白(NFH)和α-的网织蛋白,就像GFAP一样,在接下来的时间里也有所下降。
冲击波与损伤。这些重要蛋白质的丢失表明,神经末梢可能会变得与人类脱节。
脑血管也是如此。它扰乱了神经胶质血管和神经血管的连接,可能不会影响大脑的功能。
大脑功能的数量。这项新提出的研究计划将无法确定慢性脑结构紊乱和死亡的原因。
在一种低水平爆炸的大鼠模型中,爆炸和损伤对大鼠的血管系统产生了影响。
暴露。这些研究还将利用定量免疫组织化学、体视学和电子显微镜。
显微镜、西方对分离的微血管标本的印迹技术、显微CT技术、扫描扫描和行为观察。
我们还将检验这一假设,即冲击波和创伤会导致广泛的神经血管血管和血液系统的损失。
神经血管的连接和连接决定了它们的功能和后果。我们也不会确定。
是否有一种新的治疗方法可以改善创伤后应激障碍(PTSD)相关的行为。
在这种新模型中可能发展的特征也会刺激神经血管功能和神经血管功能连接。
改善显微CT扫描观察到的血管病变。术后3次复查。
此外,还将对爆炸和暴露时间进行全面检查(48小时、6周和8个月),以更好地捕捉爆炸的最新演变过程。
皮肤损伤从急性期分成亚急性期和慢性期。
英文摘要
Traumatic brain injury (TBI) has been a major cause of mortality and morbidity in the recent
conflicts in Iraq and Afghanistan. Much concern exists over the role of TBI in the chronic
cognitive and behavioral effects that can develop during or after military service. Most injuries in
the recent conflicts have been mild TBIs (mTBIs) due to blast exposure. Vascular damage is
well established as a significant component of blast injury. Indeed under the conditions of
exposure in the model under study at the histological level the cerebral vasculature seems to be
selectively vulnerable. Using micro computed tomography (CT) scanning we found that blast
induces widespread attenuation of the brain vasculature. In proteomic studies on isolated
microvascular preparations obtained two months following injury one of the most highly altered
proteins identified by mass spec (MS) was found to be glial fibrillary acidic protein (GFAP),
which was decreased by blast-exposure. This finding was confirmed by Western blotting on
isolated microvascular preps. The loss of GFAP seemed to suggest that following blast injury
astrocytic endfeet were becoming detached from cerebral vessels and immunostaining of
isolated microvascular preps supported this speculation. Interestingly of the first 9 proteins
identified by MS several others were neuronal intermediate filament proteins including the
neurofilament heavy chain (NF-H) and α- internexin, which like GFAP, were decreased following
blast injury. Loss of these proteins suggests that nerve terminals become detached from
cerebral vessels as well. Disrupted gliovascular and neurovascular connections could affect a
number of cerebral functions. The proposed studies will determine the chronic structural and
functional consequences of blast injury on the vasculature in a rat model of low-level blast
exposure. The studies will utilize quantitative immunohistochemistry, stereology, electron
microscopy, Western blotting of isolated microvascular preps, micro CT scanning and behavior.
We will test the hypothesis that blast injury causes widespread loss of gliovascular and
neurovascular connections and determine the functional consequences. We will also determine
whether a treatment that improves the post-traumatic stress disorder (PTSD)-related behavioral
traits that develop in this model stimulates gliovascular and neurovascular connections as well
improves the vascular pathology observed on micro CT scanning. Three-time points post-
blast exposure will be examined (48 hours, 6 weeks and 8 months) to capture the evolution of
the injury from acute into subacute and chronic phases.
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