脑红蛋白在内毒素脑损伤大鼠模型中的表达变化

Objective To investigate the expression of neuroglobin(Ngb) in frontal cortex, cere-brospinal fluid (CSF) and serum in rats with brain injury induced by LPS and to elucidate its significance. Methods Seventy adult Sprague-Dawley rats were randomly divided into LPS (n = 60, with injection of 0.1 mg/kg LPS into cistern) and control (C, n =10, with injection of equal volume of isotonic saline into cistern) groups, with 10 rats in each group. The plasma, CSF as well as frontal cortex from sacrificed rats were collected in LPS group at 3, 6, 12, 24, 48, 72 post injection hour (PIH), with 10 rats at each time point. The protein expression of Ngb was measured by enzyme-linked immunosorbent assay(ELISA) and Western blot. Expression of Ngb in frontal cortex was determined by SP. Water content of frontal cortex was assessed by drying method. The correlation among Ngb contents in serum, CSF, frontal cortex and water con-tent of frontal cortex was analyzed with multiple comparison. Results Ngb expression ( by ELISA) : Ngb expression of frontal cortex, CSF, and serum in LPS group was higher than that in C group at each time point, and it peaked at 48 PBH (35.4±3.9, 22.7±3.1, 14.4±2.8 ng/mL, respectively, P <0.01). Ngb ex-pression ( by Western blot) : Ngb protein with relative molecular mass of 17×103 was observed in each group. Ngb expression detected by Western blot was similar to that detected by ELISA. Brain water content was significantly greater in LPS group than that of C group at 6-72 PIH ( P<0.01) , and it peaked at 48 PBH ( 83.3±1.9) %. Ngb contents in serum, CSF, frontal cortex, and water content of frontal cortex were positively correlated with muhipie comparison (γ=0.631-0.719, P<0.01). Conclusions Up-regu-lation of Ngb expression in brain injury induced by LPS is correlated with duration after challenge of LPS.     

大鼠脊髓压迫性损伤后脱髓鞘病变及硫酸软骨素蛋白多糖的表达变化

目的 探讨脊髓压迫性损伤（CSCI）后脱髓鞘病变及硫酸软骨素蛋白多糖(CSPG,NG2)的表达变化。 方法选取健康成年SD大鼠75只,雌雄不限,采用随机数字表法将其分为正常组、假手术组、CSCI 1 d组、CSCI 3 d组和CSCI 7 d组,每组15只。采用自行设计的大鼠脊髓压迫器制作脊髓压迫模型,应用BBB运动功能评分、锇酸染色及透射电镜观察CSCI后1 d、3 d及7 d时大鼠的运动功能情况及白质有髓神经纤维的病理变化,计算脊髓后索有髓神经纤维的数量及髓鞘厚度与轴突直径的比值即G-ratio值,并采用免疫印迹法检测NG2蛋白的表达变化。 结果CSCI后,CSCI 1 d组、CSCI 3 d组和CSCI 7 d组的大鼠后肢BBB评分分别为（1.23±0.45）分、（0.65±0.35）分和（0.00±0.00）分,与正常组（21.00±0.00）分和假手术组（21.00±0.00）分相比,差异有统计学意义（P<0.05）,大鼠的运动功能随受压时间延长而逐渐下降。锇酸染色显示正常组和假手术组大鼠的白质正常,脊髓受压后,CSCI 1 d组、CSCI 3 d组和CSCI 7 d组的有髓神经纤维开始出现水肿、变性、崩解,正常组和假手术组脊髓后索的有髓神经纤维计数分别为 (2771±108）根和（2675±199)根,CSCI 1 d组、CSCI 3 d组和CSCI 7 d组的有髓神经纤维计数分别为（2403±161）根、（1708±70）根和（810±95）根,压迫后有髓神经纤维数目减少,压迫后7 d,有髓神经纤维数目减至最低（P<0.05）,与正常组和假手术组比较,差异有统计学意义（P<0.05）。电镜定量分析结果显示,正常组、假手术组、CSCI 1 d组、CSCI 3 d组和CSCI 7 d组的G-ratio值分别为（18.10±0.4）、（17.70±1.0）、（6.69±0.8）、（5.73±0.4）和（4.95±0.5）,CSCI 1 d组、CSCI 3 d组和CSCI 7 d组的G-ratio值均较正常组和假手术组低,且在压迫后7 d时降至最低,差异有统计学意义（P<0.05）。透射电镜结果显示,正常组和假手术组的轴突、髓鞘板层结构正常;脊髓受压后,轴索出现肿胀,轴浆内细胞器变性、坏死、减少;髓鞘折叠、皱缩,出现“洋葱皮”样变,髓鞘崩解;少突胶质细胞的染色质凝聚;巨噬细胞浸润。NG2蛋白免疫印迹结果显示,脊髓受压后,NG2蛋白表达水平在压迫后第1天升至最高（P<0.05）,且表达水平随压迫时间延长而逐渐下调,但均高于正常组和假手术组,差异有统计学意义（P<0.05）。 结论CSCI后,大鼠运动功能随受压时间延长而逐渐下降,有髓神经纤维发生脱髓鞘病变且数量减少,随着压迫时间延长,溃变呈现出进行性加重趋势;NG2细胞与CSCI后髓鞘的变化情况关系密切,可能增殖分化为少突胶质细胞或其它类型细胞,是脊髓髓鞘内源性修复的机制之一。     

“以器官系统为中心，基础与临床全线整合”教学模式解剖学知识点整合的实践与思考

正回顾高等医学教育课程模式,20世纪50年代"以器官系统为中心"的课程模式问世;90年代,美国医学院校协会在全国推行"医学院校培养目标研究项目",许多院校实行了以器官系统为中心的课程、以问题为导向的课程、以社区为基础的课程等整合课程,成为第2次医学教育改革,对     

结合专业特色,提高护理解剖学教学效果

护理本科教育是培养护理人才的重要教育方式,护理解剖学教学是培养高级护理人才的重要课程之一,结合近年来护理解剖学教学过程中存在的问题,从师资、教材、课程建设、实验室建设和教学方法等方面,提出提高护理解剖学教学质量的几点初步设想。     

NGF及NGFR对雄性生殖系统的作用

１９５９年Ｌｅｖｉ -Ｍｏｎｔａｌｃｉｎｉ在蛇毒中首先发现神经生长因子 (ｎｅｒｖｅｇｒｏｗｔｈｆａｃｔｏｒ，ＮＧＦ) ,ＮＧＦ的发现被认为是神经科学发展史上的重要里程碑。通常认为 ,ＮＧＦ在特定阶段对特定的交感、感觉神经元和中枢神经系统某些胆碱能神经元的发育、分化、行使正常生理功能有重要的作用［１］。近年来发现ＮＧＦ不仅对神经系统有作用 ,而且对生殖系统、免疫系统、癌前病变及肿瘤组织等也具有十分重要的作用。雄性生殖器官中广泛存在ＮＧＦ及其受体 (ＮＧＦＲ) ,它们可能在雄性生殖系统的发育、形态、功能以及病理过…     

胰淀素在痴呆小鼠和正常小鼠脑内的分布和表达变化

目的 观察胰淀素在正常小鼠、阿尔茨海默病(Alzheimer's disease,AD)模型小鼠和肥胖模型小鼠脑内的分布和表达情况,分析其与小鼠脑内老年斑的关系,探讨胰淀素是否参与老年性痴呆的发病.方法 取5月龄雄性APP/PS1双转基因小鼠(AD模型小鼠)、ob/ob肥胖模型小鼠及野生型小鼠(正常小鼠),采用免疫荧光染色方法检测胰淀素和老年斑在各组小鼠脑内的分布和表达.结果 免疫荧光双标检测结果显示:胰淀素免疫阳性神经元广泛分布于APP/PS1双转基因小鼠脑内,包括皮质、海马、丘脑等区域,强阳性表达于岛叶和梨形皮质区域(P＜0.01),而老年斑则选择性表达于新皮质、海马等区域,胰淀素的分布范围较老年斑的分布广泛,在部分老年斑的周围可见胰淀素免疫阳性物质分布.5月龄AD模型小鼠、ob/ob肥胖模型小鼠新皮质内胰淀素阳性神经元数目明显高于正常小鼠(P＜0.05,P ＜0.01).结论 胰淀素在AD模型小鼠、ob/ob肥胖模型小鼠及正常小鼠脑内的分布和表达存在差异,这种差异有可能促进老年斑的形成以及参与AD疾病的发生.     

做好基础医学课程教学秘书的几点体会

结合工作实际，从热爱教学工作、加强团结协作与合理安排教学、重视教学信息收集、做好考试工作、积极参与教学改革等方面。讨论如何做好高等医学院校有关基础医学教学的教研室教学秘书一职。     

脑红蛋白在内毒素脑损伤大鼠模型中的表达变化

Objective To investigate the expression of neuroglobin(Ngb) in frontal cortex, cere-brospinal fluid (CSF) and serum in rats with brain injury induced by LPS and to elucidate its significance. Methods Seventy adult Sprague-Dawley rats were randomly divided into LPS (n = 60, with injection of 0.1 mg/kg LPS into cistern) and control (C, n =10, with injection of equal volume of isotonic saline into cistern) groups, with 10 rats in each group. The plasma, CSF as well as frontal cortex from sacrificed rats were collected in LPS group at 3, 6, 12, 24, 48, 72 post injection hour (PIH), with 10 rats at each time point. The protein expression of Ngb was measured by enzyme-linked immunosorbent assay(ELISA) and Western blot. Expression of Ngb in frontal cortex was determined by SP. Water content of frontal cortex was assessed by drying method. The correlation among Ngb contents in serum, CSF, frontal cortex and water con-tent of frontal cortex was analyzed with multiple comparison. Results Ngb expression ( by ELISA) : Ngb expression of frontal cortex, CSF, and serum in LPS group was higher than that in C group at each time point, and it peaked at 48 PBH (35.4±3.9, 22.7±3.1, 14.4±2.8 ng/mL, respectively, P <0.01). Ngb ex-pression ( by Western blot) : Ngb protein with relative molecular mass of 17×103 was observed in each group. Ngb expression detected by Western blot was similar to that detected by ELISA. Brain water content was significantly greater in LPS group than that of C group at 6-72 PIH ( P<0.01) , and it peaked at 48 PBH ( 83.3±1.9) %. Ngb contents in serum, CSF, frontal cortex, and water content of frontal cortex were positively correlated with muhipie comparison (γ=0.631-0.719, P<0.01). Conclusions Up-regu-lation of Ngb expression in brain injury induced by LPS is correlated with duration after challenge of LPS.     

脑红蛋白在脊髓缺血再灌注损伤中的表达及其意义

目的:观察大鼠脊髓缺血再灌注损伤(SCI)过程中脑红蛋白(Ngb)的表达变化及其意义。方法:健康成年Wistar大鼠随机分为脊髓压迫缺血再灌注组和假手术对照组。运用原位杂交组织化学和免疫印迹法,检测压迫段脊髓组织中Ngb的表达变化。结果:再灌注2h后,Ngb在压迫段脊髓开始表达上调,24h较为明显,48h达峰值,72h表达减少,与假手术组相比较,具有显著性差异。免疫印迹法的结果和上述结果一致。结论:在脊髓缺血再灌注损伤中Ngb的表达变化与再灌注时间相关,其表达上调是机体内源性神经保护之一。