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大黄改善急性脑出血大鼠血脑屏障损伤的水通道蛋白-4机理研究 总被引:31,自引:0,他引:31
目的探讨大黄改善急性脑出血血脑屏障损伤的水通道蛋白-4(aquaporin-4,AQP-4)机理。方法采用立体定向注射自体无肝素动脉血制作大鼠脑出血模型,对神经功能缺损、脑含水量进行观察,伊文思蓝染色观察血脑屏障紧密连接(blood-brain barrier tight junction,BBBTJ)的损害,电镜观察不同时间点BBB和神经星形胶质细胞足突改变,用RT-PCR和Western blot检测AQP-4InRNA和蛋白表达。结果脑出血后,与模型组比较,大黄可明显减轻脑水肿;伊文思蓝染色结果显示血脑屏障从12h开始明显损害;电镜结果提示出血后12h血脑屏障紧密连接被破坏,而且神经星形胶质细胞足突肿胀;大黄可有效使血脑屏障紧密连接的破坏减少、神经星形胶质细胞足突肿胀减轻。脑出血模型组大鼠AQP-4表达出现增高(P〈0.05);脑出血后1天AQP-4mRNA和AQP-4蛋白表达增强,第3天达峰值,其后逐渐有所下降。大黄可抑制AQP-4基因特录和翻译。结论大黄可通过改善血脑屏障损伤减轻脑水肿;大黄改善血脑屏障破坏的作用可能是通过抑制AQP-4基因转录和翻译实现的。 相似文献
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Objective:To observe the therapeutic effect of Yangxue Qingnao granule (养血清脑颗粒,YXQNG) in treating chronic cerebrovascular insufficiency (CCI) and its possible mechanism. Methods:Eighty-three patients with CCI were randomly divided into YXQNG and nimodipine (ND) groups, the score of vertigo and the change in cerebral blood velocity before and after treatment were observed. And in the animal experiment, the authors adopted bilateral ligation of cervical carotid communis artery to establish CCI rat models in order to observe the effect of YXQNG and ND on incubation period of vertigo in rats and on memory performance. Results: After clinical treatment, the vertigo score of YXQNG group was 2.34, and that of the ND group was 4.18, the comparison between the two groups showed that the difference was significant (P<0.05). After treatment, the middle cerebral artery mean velocity (MCA Vm) of YXQNG group was 64. 78cm/s, vertebral artery mean velocity (VA Vm) was 29.78 cm/s, while that of ND group was 60.34 cm/s and 23. 23 cm/s respectively, the comparison between these two groups showing statistical significance and the difference being obvious (P<0.05). Experimental study showed that the rats in the model group after 12weeks learning and memory were markedly lowered, the vertigo incubation period significantly lengthened,and compared with that of the model group, learning and memory of the YXQNG group was markedly improved and vertigo incubation period shortened, with the difference from that of the ND group insignificant, P >0.05. Conclusion: YXQNG could effectively improve CCI patients' vertigo and other clinical symptoms and increase the cerebral blood flow, lessen the vertigo incubation of model group rats, elevate model group rats'memory performance. 相似文献
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目的:观察鱼藤酮对大鼠中脑纹状体多巴胺能神经系统、肝、肾等组织的损伤及松果菊苷的干预作用。方法:雄性健康Sprague-Dawley大鼠被随机分为对照组,模型组和低、中、高剂量松果菊苷干预组。运用鱼藤酮2.75mg/(kg·d)腹腔注射4周的方法制作大鼠帕金森病模型;对照组腹腔每日注射同等体积不含鱼藤酮的溶解液;干预组除注射鱼藤酮外,分别给予松果菊苷20、40、80mg/(kg·d)灌胃处理。运用改良神经功能缺损评分(modified neurological severity score,mNSS)测量大鼠的神经行为改变,采用试剂盒检测其肝、肾损伤的指标,酪氨酸羟化酶免疫染色观察中脑黑质多巴胺能神经元的数目,比色法测定纹状体多巴胺的含量。结果:与正常对照组比较,鱼藤酮模型组肝、肾损伤的指标明显上升(P〈0.05),mNSS升高(P〈0.01),黑质多巴胺能神经元数目显著减少(P〈0.05),纹状体多巴胺含量降低(P〈0.05);与模型组相比,松果菊苷低、中、高剂量组肝、肾功能没有显著改善(P〉0.05),但mNSS显著降低(P〈0.05),黑质多巴胺能神经元数增加(P〈0.05),纹状体多巴胺含量也增加(P〈0.05),以上保护效应呈现剂量依赖性。结论:鱼藤酮能引起大鼠严重的黑质-纹状体多巴胺能神经系统以及肝、肾等组织的损伤,松果菊苷可以选择性地改善其神经损伤。 相似文献
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目的:从个体内和人际间两条路径探索护士的情绪劳动策略对工作倦怠的作用机制。方法:以珠海五家公立医院的在职护士为对象,采用团体匿名施测的方式发放情绪劳动策略量表、对患者反应的满意度问卷(测量人际间因素)、心理付出问卷(测量个体内因素)、工作倦怠量表-服务版,共收集有效数据252份。结果:路径分析结果显示,首先,从直接关系上看,表层扮演对情绪衰竭和去人性化都具有正向预测作用,深层扮演正向预测情绪衰竭但同时也能提升个人成就感,自然表现则显著负向预测去人性化;其次,三种情绪劳动策略都可以部分或完全通过提升对患者反应的满意程度降低工作倦怠水平,与此同时表层扮演还会部分通过增加心理付出提高情绪衰竭和去人性化水平。结论:不同情绪劳动策略可以通过个体内(心理付出)和人际间(对患者反应的满意度)两条路径影响工作倦怠的不同方面;相对来说自然表现的情绪劳动策略无论对患者还是对护士自身都是最有益的。 相似文献
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活血化瘀是治疗恶性肿瘤的有效方法之一。本文观察了血瘀型恶性肿瘤病人的红细胞膜流动性、微粘度及血液流变性等七项指标,对血瘀型恶性肿瘤的本质作了初步探讨。 材料与方法 一、红细胞膜流动性测定 红细胞悬液的制备:取静脉血2ml,肝素抗凝,离心后用磷酸缓冲液(PBS)洗三次,以高倍显微镜下找不到血小板为度。配成10~(10)个红细胞/ml的悬液备用。使用时用pH7.4的PBS稀释成2×10~(-6)mol/L中的DPH。荧光偏振度测量:于3ml×10~(-6)mol/L的DPH液中加 相似文献
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