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Embryonic stem cell (ESC)-derived products have emerged as a promising cell source for neuroregeneration. C17.2 neural precursor cells were noted to express genes of neurotrophins and neuroprotective factors and to be enable to enhance proliferation, neuritogenesis, and differentiation of SH-SY5Y and SK-N-AS neuroblasts, suggesting their neurotrophic potential. We used C17.2 cells as neurotrophic chaperones to induce ESCs, D3, and E14TG2a into neural lineage cells. Significantly greater numbers of Sox-2(+), Musashi-1(+), and nestin(+) neurospheres developed in noncontact cocultures than in cultures of ESCs without C17.2 support or with 50% conditioned medium after 8 days. Immunoreactivity of the neuronal, astrocytic and oligodendrocytic markers was evident in cultures further differentiated for 10 days. Expression of Pax-6, Otx-1, and Nurr-1 genes suggested neuroectodermal precursors in products encompassing neural stem cells, dopaminergic neurons, astrocytes, and oligodendrocytes. Alpha-fetoprotein, GATA-4, Brachyury, Nkx-2.5, and Myf-5 genes were not detected, indicating any mesodermal and endodermal cells. However, weak expression of Oct-4 was noted. Behavioral assessment of ischemic mice 2 weeks after transplantation revealed significant improvement in cognitive function compared with that in ischemic sham-operated mice. Tracking bromodeoxyuridine-labeled products demonstrated that mostly implanted cells were localized along the needle track of the injection in the brain parenchyma, whereas some migrated to the striatum, cortex, nerve fiber bundle of the corpus callosum, and hippocampus in the ipsilateral hemisphere. One episode (of 22) of teratoma development was noted. Data from this study suggest a paradigm of trophism of neural progenitor cells for induction of ESCs into neural lineage cells.  相似文献
目的:研究踝臂指数(ankle-brachialindex,ABl)与脑卒中动脉硬化危险因素及动脉硬化程度的关系。方法:选择在宣武医院及北京电力医院神经内科住院的急性起病、年龄<80岁的缺血性脑卒中患者,测量AB工并进行资料收集。分别按NASCET分级法及斑块程度分级将完成检查的患者进行分组,分析脑动脉狭窄程度与AB工的相关性。结果:177例脑卒中患者中AB工异常率31.64%(56/177),年龄、糖尿病和吸烟是预测AB工异常的独立因素(户均<0.05),以AB工≤0.9作为截断值预测脑动脉重度狭窄具有较好的灵敏度和特异度。颈内动脉、大脑中动脉狭窄程度与AB工呈负性相关(r=-0.603,p<0.05;r=-0.736,p<0.01)o颈动脉内膜中层厚度与ABI呈高度负相关(严.0.817,p<0.01)。结论:踝臂指数与动脉硬化程度有关,高龄、糖尿病和吸烟是预示AB工异常的独立影响因子。  相似文献
法舒地尔与丁咯地尔治疗急性缺血性脑卒中的临床研究   总被引:7,自引:0,他引:7  
目的:应用临床病例对照试验评价Rho激酶抑制剂法舒地尔治疗急性缺血性脑卒中的临床疗效和安全性。方法:选择符合入选标准的72例急性缺血性脑卒中患者,在发病后72h内开始用盐酸法舒地尔及盐酸丁咯地尔进行治疗,观察治疗前后患者SSS评分及发病1个月后mRs评分的变化,并观察其不良反应。结果:法舒地尔及丁咯地尔治疗2周后神经功能均有显著改善(分别P<0.001,P<0.01),法舒地尔较丁咯地尔疗效更显著(P<0.01),且两者均可使发病1个月后的临床结局显著改善(分别P<0.001,P<0.05),法舒地尔较丁咯地尔更显著(P<0.01)。两组均无严重不良反应。结论:急性缺血性脑卒中发病后72h内用法舒地尔,可有效改善患者神经功能缺损和临床结局,无严重不良反应。  相似文献
他汀类药对脑梗死的临床疗效和作用机制   总被引:6,自引:0,他引:6  
多项研究已经提示他汀类药可以降低缺血性脑卒中发生率,具有神经保护作用。他汀类药除降血脂作用外,还有改善血管内皮功能,减少氧化应激,抑制炎性反应等作用。缺血性脑卒中患者使用他汀类药治疗后恢复较好,这不仅归因于他汀类药的调脂作用,其还有各种非降脂作用,称他汀类药具有多效性。本文总结了有关他汀类药多效性作用的实验研究,以及他汀类药预防缺血性脑卒中的临床试验研究。  相似文献
Stroke is the leading cause of adult disability in the United States. To date there is no satisfactory treatment for stroke once neuronal damage has occurred. Human adult bone marrow-derived somatic cells (hABM-SC) represent a homogenous population of CD49c/CD90 co-positive, non-hematopoietic cells that have been shown to secrete therapeutically relevant trophic factors and to support axonal growth in a rodent model of spinal cord injury. Here we demonstrate that treatment with hABM-SC after ischemic stroke in adult rats results in recovery of forelimb function on a skilled motor test, and that this recovery is positively correlated with increased axonal outgrowth of the intact, uninjured corticorubral tract. While the complete mechanism of repair is still unclear, we conclude that enhancement of structural neuroplasticity from uninjured brain areas is one mechanism by which hABM-SC treatment after stroke leads to functional recovery.  相似文献
Expanding autologous multipotent mesenchymal bone marrow stromal cells   总被引:5,自引:0,他引:5  
In this brief review, I will start by redefining the cells: mesenchymal stem cells should now be called multipotent mesenchymal stromal cells, with the same acronym (MSC). I will review the role of MSC as immunosuppressive and immunoprotected cells, and then go on to describe how cell culture strategies may depend on the desired functionality of MSC. In order to expand MSC in vitro, the cells have to be cultured as adherent cells on plastic surfaces. To obtain the best cell culture conditions, a number of methodological decisions have to be made. Special considerations are necessary if the cells are to be used for the treatment of patients.  相似文献
Abstract Objective To determine independent clinical predictors of stroke-associated pneumonia (SAP) that are available in all patients on day of hospital admission. Methods We studied 236 patients with acute ischemic stroke admitted to the neurological intensive care unit at our university hospital. Risk factors of SAP and of non-responsivity of early-onset pneumonia (EOP; onset within 72 hours after admission) to initial antibacterial treatment were analyzed. Results Incidence of SAP was 22%. The following independent risk factors were found to predict SAP with 76% (EOP: 90%) sensitivity and 88% specificity: dysphagia (RR, 9.92; 95% CI, 5.28-18.7), National Institute of Health Stroke Scale ≥ 10 (RR, 6.57; CI, 3.36-12.9), non-lacunar basal-ganglia infarction (RR, 3.10; CI, 1.17-5.62), and any other infection present on admission (RR, 3.78; CI, 2.45-5.83). Excluding the patients with other infections on admission, the same independent risk factors (except infection) were found. Further, but not independent risk factors were: combined brainstem and cerebellar infarction, infarction affecting more than 66% of middle cerebral artery territory, hemispheric infarction exceeding middle cerebral artery territory, impaired vigilance, mechanical ventilation, age ≥ 73 years, current malignoma, and cardioembolic stroke, whereas patients with lacunar infarctions had significantly lower risk. In contrast to previous reports, no impact of male gender or diabetes was found. Initial vomiting, especially if associated with impaired vigilance, predicted antibacterial treatment non-responsivity of EOP. In nonresponders exclusively fungal pathogens were identified. Conclusion Increased risk of pneumonia in acute stroke patients can be sufficiently predicted by a small set of clinical risk factors.  相似文献
“病理生理窗”指导下的溶栓干预模式探讨   总被引:4,自引:0,他引:4  
目的:分析“时间窗指导下的溶栓治疗”的局限性,提出新型溶栓干预模式。方法:本研究通过对比分析5例急性缺血性脑血管病患者“时间窗”、“缺血半暗带”和“溶栓干预疗效”之间的相关关系。阐释“时间窗指导下溶栓治疗”的局限性,进而提出新型急性脑血管病溶栓干预模式的设想。结果:“时间窗”指导下的溶栓治疗有其固有的局限性,集中体现在以下两个方面。其一,对于那些发病虽然在经典溶栓干预时间窗内。但已经无缺血半暗带存在的患者实施了溶栓治疗,增加出血并发症发生的机率。其二,对于那些发病虽然超过经典时间窗,但仍然有可挽救脑组织存在的患者却放弃了溶栓治疗,降低了患者从溶栓治疗中受益的机会。结论:“病理生理窗指导下的溶栓治疗”,倡导根据缺血的病理生理特点进行溶栓决策,实施个体化的溶栓治疗,是一种更为理想的溶栓干预模式。  相似文献
血浆纤维蛋白原和D-二聚体水平与进展性卒中关系的研究   总被引:3,自引:0,他引:3  
目的探讨缺血性卒中患者血浆纤维蛋白原(Fib)、D二-聚体(D-dimer)水平的动态变化,揭示其在卒中进展中的作用及早期诊断价值。方法用酶联免疫吸附试验(ELISA)法、全自动血凝仪分别检测50例完全性缺血性卒中、40例进展性卒中患者发病24h内、第3天、第7天、第14天、第21天及40例正常对照者血浆D-dime、rFib水平,并对缺血性卒中组患者相应的神经功能缺损情况进行斯堪地那维亚量表(SSS)评分。结果完全性卒中组发病24h内血浆F ib水平显著高于正常对照组,差异有统计学意义(P<0.01),第3天时有下降趋势,第7天时降至正常。进展性卒中组发病24h内血浆Fib水平较完全性卒中组升高更明显(P<0.01),3d时达最高峰,14d降至正常。完全性卒中组发病24h内血浆D-dim er水平较正常对照组明显升高(P<0.01),3d时达高峰,7d降至正常,而进展性卒中组发病24h较完全性卒中组明显升高(P<0.01),至第7天达高峰,第14天迅速降至正常。进展性卒中组3w时神经功能缺损恢复较完全性卒中组为差(P<0.01)。结论对缺血性卒中患者进行血浆F ib和D-d im er水平的动态监测,有助于...  相似文献
急性缺血性脑卒中早期神经功能恶化诊治进展   总被引:3,自引:0,他引:3  
急性缺血性脑卒中早期神经功能恶化(early neurological deterioration,END)也称进行性或进展性卒中,指早期阶段病情继续进展、神经功能损伤逐渐加重,其发病机制目前尚未完全阐明,亦缺乏早期识别及治疗的有效手段,死亡率和病残率较高.本文就近年END诊治的相关研究进展做一综述.  相似文献
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