MINT蛋白(1-365氨基酸)相互作用分子的筛选

目的 :用酵母双杂交技术筛选与MINT(Msx2 in teractingnucleartargetprotein) F1片段相互作用的分子 ,对MINT转录抑制的机制进行探讨 .方法 :以Mint F1片段 (1～ 36 5氨基酸残基 )连入载体pGBKT7构建的质粒为诱饵 ,利用酵母双杂交技术对人淋巴结cDNA文库进行筛选 ,并分析所获得的阳性克隆 .结果 :从 6× 1 0 7个克隆中共获得 1 2个不重复的阳性克隆 .经序列分析 ,得到 3个有意义的基因 ,分别为人小核RNA 蛋白复合体多肽G(SNRPG)、癌基因Vav和人微球蛋白 1 (MCRS1 ) .结论 :从筛选到的这 3个分子的定位与功能来看 ,MINT分子的N端片段可以与小核RNA 蛋白复合体 (snRNPs) ,Vav,MCRS1和RBP Jκ等相互作用 ,参与细胞内的信号传递 ,调控细胞周期 ,并可能影响RNA的加工与处理     

嗅鞘细胞移植修复脊髓损伤的研究进展

脊髓损伤(spine cord injury,SCI)是骨科领域常见的疾病,损伤后果严重,给受害者个人和社会都带来了巨大负担。其治疗一直是科学家和临床医生面临的颇具挑战性的问题。以往一直认为脊髓损伤后,将引起损伤段以下永久性感觉、运动和括约肌功能丧失。然而近年来研究发现,嗅神经鞘细胞(olfactory ensheathing cells,OECs)不仅能促进轴突再生,且能引导再生的轴突重新进入中枢神经系统,从而与靶器官形成新的功能连接[1]。因此,OECs被认为是细胞移植修复SCI中很有希望的种子细胞之一,并且具有潜在的临床应用价值。1OECs促进SCI修复的功能OE…     

Poststroke DNA immunization against neurite growth inhibitors is beneficial to the recovery from local cerebral ischemia in rats

BACKGROUND： Inhibitory signals, i.e. neurite growth inhibitors （NGIs）, presenting on central nervous system （CNS） myelin have been shown to play a crucial role in inhibiting lesioned axonal sprouting and leading to less functional recovery. Vaccines targeting NGIs may provide multifactorial protection against brain insults by overcoming the inhibitory effects of these NGIs and boosting the body＇s immune repair mechanisms. OBJECTIVE： To evaluate the effect of poststroke DNA immunization against NGIs on the rehabilitation for sensorimotor function of rat models of local cerebral ischemia. DESIGN： Completely randomized grouping design, and controlled experiment. SETTING： Brain Injury Research Laboratory, Department of Neurosurgery, National Neuroscience Institute, Singapore. MATERIALS： Sixty adult male Sprague-Dawley rats ranging in age from 45 to 120 days and in weight from 180 to 250 grams were provided by Animal Center of Department of Anatomy, Faculty of Medicine, National University of Singapore. pcDNA3.1（＋）-neurite growth inhibitors （pcDNA-NGIs） a gift was provided by Dr. Xiao from Department of Clinical Research, Singapore General Hospital, Singapore. METHODS： The experiment was carried out at Brain Injury Research Laboratory, Department of Neurosurgery, National Neuroscience Institute, Singapore from August 2003 to April 2005. （1）The involved rats were randomized into 3 groups： pcDNA-NGIs group （group A）, pcDNA3.1 （＋） group （group B） and model group （group C）, with 20 rats in each group. Left focal cerebral ischemia （FCI） was permanently induced through middle cerebral artery occlusion （MCAO） with the assistance of an operating microscope. Successful MCAO was determined by a 20% decrease to baseline in the ipsilateral cerebral blood flow. 100 μg of pcDNA-NGIs eluted in phosphate-buffered saline （PBS） was intramuscularly injected into the tibial muscle once a week after MCAO for 6 weeks in group A. As control, pcDNA3.1 （＋） was also administrated in the same way in group B and nothing was administrated in group C. （2） The modified neurological severity score （mNSS）, a composite of motor, sensory, reflex and balance tests, was used to test the sensorimotor deficit. The mNSS was graded on a scale of 0 - 18, i.e. normal score was 0, maximal deficit score was 18, and 1 point was warded for the inability to perform the tasks or the lack of a tested reflex. （3） The newly generated axons of corticorubral projection were traced by stereotaxic guided injection of 100 g/L biotinylated dextran amine. Rats were sacrificed two weeks after tracing, and cryostat coronal sections of midbrains （30μm） were reacted to BDA according to the manufacturer＇s instruction by the free-floating method. Images were captured on a DM RXA2 LEICA Microscope with a Spot Digital Camera system （Germany）, and the numbers of labeled axons on the denervated side in four standard coronal sections including the red nucleus were manually quantified. MAIN OUTCOME MEASURES： （1） The number of newly generated axons of corticorubral projection. （2）The improvement in sensorimotor deficit. RESULTS： All the involved 60 rats entered the stage of final analysis. （1） The number of newly generated axons of corticorubral projection of rats： Only ipsilateral axons of CRP were noted with little evidence of fibers crossing to the contralateral red nucleus in rats of groups B and C. More BDA-positive fibers crossing the midline and terminating in the contralateral red nucleus in appropriate target areas mirroring the non-differentiated red nucleus were found in rats of group A. Quantitative analysis showed that BDA-labeled axons in the denervated side of rats in group A were more than those in group B （P 〈 0.05）. （2） Improvement in sensorimotor deficit of rats： At 2 weeks after immunization, significant improvement in sensorimotor deficit was found in rats of group A. There were significant differences of improvement in sensorimotor deficit of rats between group A and group B or group C at 12 and 14 weeks after immunization （P 〈 0.05）. CONCLUSION： （1） Poststroke DNA immunization against NGIs leads to increased sensorimotor recovery following FCI and compensatory newly growth of axons from corticorubral projection.     

Estenia瓷树脂复合体制作冠桥的强度测试

目的:探讨Estenia瓷树脂复合体的强度,并与其他几种树脂材料进行比较,为临床选择冠桥树脂材料提供参考。方法:采用Estenia瓷树脂复合体体外模拟下颌第一磨牙单冠和第一磨牙缺失3个单位固定桥的形态,测试单冠的抗压强度和固定桥的抗弯强度,并与Artglass、Solidex、Targis3种树脂材料在相同实验方法下测试得到的结果作比较。结果:Estenia瓷树脂单冠的折裂最大载荷均值为600.20N,Estenia瓷树脂桥的折裂最大载荷均值为302.53N。结论:Estenia瓷树脂复合体的强度高于Artglass﹑Solidex和Targis树脂复合体。     

窦口鼻道复合体的影像学研究进展

功能性鼻内突镜手术的广泛开展为慢性鼻窦炎的诊断和治疗开创了新的领域,同时也促进了相关的解剖、病理和影像学的研究.基于对鼻腔、鼻窦生理及病理学的新的认识,Naumann等人提出了窦口鼻道复合体(Ostiomeatal Complex OMC)这一解剖概念,并得到广大学者的认可.窦口鼻道复合体和显微解剖及影像学研究对于鼻窦炎的病因、病理及鼻内窥镜手术治疗具有重要意义,尤其是术前的鼻窦CT扫描,已成为指导手术,预防并发症的必不可少的检查方法.1 窦口鼻道复合体的解剖 窦口鼻道复合体又称中鼻道-前筛复合体,是指以筛漏斗为中心的附近区域,包括筛漏斗、钩突、筛泡、半月裂、额隐窝、中鼻甲及其基板、中鼻道、前组和中组筛窦、额窦开口、上额窦开口以及鼻囟门等一系列结构.窦口鼻道复合体是侧重于鼻窦功能而命名的一个解剖名称,并没有明确的解剖边界和形态-实质上它是介于中鼻甲与下鼻甲之间,包含了前组副鼻窦(上颌窦、额窦、前筛窦)开口及其向鼻腔     

杓状软骨复合体研究进展

杓状软骨复合体为一功能体，包括杓状软骨及其附着结构。由于其解剖位置深在且结构复杂，给手术带来了一定的困难。目前临床上行杓状软骨复合体手术有关入路包括喉前、经口和喉侧入路。本文从解剖基础和手术入路方面的研究进展作一综述。     

卡氏肺孢子虫的超微结构观察

采用皮下注射醋酸可的松和低蛋白饲养方法诱发SD大鼠自然感染卡氏肺孢子虫后,取其肺组织,按常规方法进行透射电镜的系统观察。结果除为Yoshida提出的卡氏肺孢子虫生活史的有性增殖和无性增殖循环的最新设想提供了某些形态学依据外,还继Vossen等之后再次发现该病原在1型肺泡上皮细胞内寄生的情况。本文最后就卡氏肺孢子虫对宿主的致病机理进行了讨论。     

玻璃离子粘结银汞合金充填无鸠尾Ⅱ类洞的临床研究

目的　比较玻璃离子粘结银汞合金充填与复合树脂充填无鸠尾Ⅱ类洞的临床疗效。方法　临床选取 312例 390个双尖牙邻面浅龋及中龋患者 ,随机分为两组 ,经常规去腐 ,制备无鸠尾Ⅱ类洞。实验组以银汞充填 ,充填前以玻璃离子进行洞衬 ,对照组直接以复合树脂充填。所有病例随访追踪 2年以上 ,通过临床检查对其进行临床疗效评定。结果　玻璃离子粘结银汞组成功率为 89% ,复合树脂组成功率为 80 %。对其进行 χ2检验 ,两者有显著性差异 (P <0 .0 5 )。结论　玻璃离子粘结银汞合金充填无鸠尾类洞技术在临床上是可行的 ,其疗效较复合树脂充填为优