摘要
背景:绝大多数转基因实验动物来源于小鼠,建立一种小鼠局灶性脑缺血再灌注模型对缺血性脑血管病的防治研究具有重大意义。目的:建立一种适用于医学研究的、简便可靠的小鼠大脑中动脉闭塞再灌注模型。设计:随机对照动物实验。单位:青岛大学医学院附属医院脑血管病研究所。材料:健康BALB/c小鼠20只,雌雄不拘,体质量25～30g,SPF级,随机数字表法分为假手术组(5只)、缺血组(10只)和再灌注22h组(5只)。健康昆明雄性小鼠130只,雌性30只,体质量25～30g,SPF级,其中雄性小鼠随机数字表法分为假手术组10只,缺血24h组30只,缺血2h再灌注22,46,70h组各30只;雌性小鼠随机数字表法分为假手术组10只,缺血24h组10只,缺血2h再灌注22h组10只。方法:实验于2005-07/2006-03在青岛大学医学院附属医院脑血管疾病研究所完成。上述SPF级BALB/c小鼠与昆明小鼠,应用头端涂适量硅胶的6-0单尼龙线自小鼠左侧颈外动脉向颈内动脉插入至大脑中动脉起始部,阻断其血流2h后拔出线栓实现再灌注。假手术组术后24h,缺血组阻断血流24h后,再灌注组分别于术后24,48,72h,麻醉下断头取脑。以神经行为功能评分和氯化三苯基四氮唑染色对模型的可靠性进行评价。Longa标准评分:神经行为功能评分≥1分为模型成功的标准;脑组织冠状切片,氯化三苯基四氮唑染色,白色区域为梗死区。主要观察指标:各组小鼠神经行为功能评分,脑组织氯化三苯基四氮唑染色后梗死体积。结果:实验动物全部进入结果分析。①模型成功率BALB/c小鼠约为20%,昆明小鼠雄性为66.7%～73.3%,昆明小鼠雌性为40%～50%。②BALB/c小鼠假手术组氯化三苯基四氮唑染色的脑切片上,两侧皮层呈均匀的橘红色,未见梗死灶。BALB/c小鼠缺血组小鼠脑切片上可见较大的苍白色梗死区,在经视交叉的冠状切片上,梗死区占同侧半球体积的50%～75%,昆明小鼠表现与BALB/c小鼠相似,但梗死区占同侧半球体积的40%～65%。缺血再灌注组与缺血组相似,小鼠脑切片上可见较大的苍白色梗死区,在经视交叉的冠状切片上,梗死区占同侧半球体积的50%～75%,昆明小鼠表现与BALB/c小鼠相似,但梗死区占同侧半球体积的40%～65%。结论:线栓法制作昆明小鼠大脑中动脉闭塞再灌注模型创伤小,缺血的部位较恒定,可以准确控制缺血和再灌注时间,可以成为研究脑血管疾病的病理生理改变、预后及治疗作用的理想实验动物模型。
BACKGROUND： Most animal experiments of transgene are derived from mice; therefore, it is necessary to establish a focal cerebral ischemia-reperfusion model and significant to prevent and cure ischemic cerebrovascular diseases.
OBJECTIVE： To establish a convenient and reliable model with middle cerebral artery occlusion reperfusion （MCAO/R） in mice.
DESIGN： Randomized controlled animal study.
SETTING： Institute of Cerebrovascular disease, Affiliated Hospital of Medical College of Qingdao University.
MATERIALS： Twenty healthy BALB/c mice, of both genders, weighing 25-30 g, of SPF grade, were divided into sham operation group （n=5）, ischemia group （n=10） and 22-hour reperfusion group （n=5） on the basis of digital table. In addition, according to digital table, 130 healthy male Kunming mice were divided into sham operation group （n=10）, 24-hour ischemia group （n=30）, 2-hour ischemia/22-hour, 46-hour and 70-hour reperfusion groups with 30 in each group; meanwhile, 30 female mice were divided into sham operation group, 24-hour isehemia group and 2-hour ischemia/22-hour reperfusion group with 10 in each group. All Kunming mice were weighing 25-30 g and of SPF grade.
METHODS： The experiment was carried out in the Institute of Cerebrovascular Disease, Affiliated Hospital of Medical College of Qingdao University from July 2005 to March 2006, The 6-0 suture with silica gel covered at an end was sent from the left external carotid artery （ECA） into internal carotid artery （ICA） till arriving at the initiation of middle cerebral artery （MCA） to block the blood stream in it, then drawing the suture from ICA 2 hours after occlusion to accomplish reperfusion. Mice were cut off their heads in sham operation group at 24 hours after operation, in ischemia group at 24 hours after blocking blood stream and in reperfusion group at 24, 48 and 72 hours after operation. Reliability of models was evaluated with neurology score and tetrazolium chloride stain. Longa standard scores： neurology score ≥ 1 point was regarded as successful models; coronal sections of brain tissue were stained with tetrazolium chloride, and the white region was regarded as infarcted volume.
MAIN OUTCOME MEASURES： Neurology score and infarcted volume after staining of triphenyltetrazolium chloride in brain tissue.
RESULTS： All mice were involved in the final analysis. ① Successful rate was 20% of BALB/c mice, 66.7%-73.3% of male Kunming mice and 40%-50% of female Kunming mice. ② Brain sections of BALB/c mice in sham operation group were orange at both sides of cortex and infarction focus was not observed. A big infarcted volume was observed on brain sections of mice in ischemia group, and infarcted volume counted for 50%-70% as homonymy hemisphere on optochiasmatic coronal sections. The condition of Kunming mice was similar to that of BALB/c mice, but infarcted volume counted for 40%-65%. In addition, condition in ischemia-reperfusion group was similar to that in ischemia group, A big infarcted volume was observed on brain sections, and infarcted volume counted for 50%-75% as homonymy hemisphere on optochiasmatic coronal sections. The condition of Kunming mice was similar to that of BALB/c mice, but infarcted volume counted for 40%-65%.
CONCLUSION： The model with MCAO/R in mice characterizes by relatively smaller trauma, and the ischemic region is stable; therefore, it can be used to accurate timing control of ischemia/reperfusion. This model is an ideal one for researching pathophysiological changes, prognosis and therapy in cerebrovascular disease.
出处
《中国临床康复》
CSCD
北大核心
2006年第46期201-204,共4页
Chinese Journal of Clinical Rehabilitation
基金
山东省自然科学基金资助项目(Y2004C04)~~
