后膜骨架蛋白1a在小鼠脑缺血再灌注损伤中的作用

目的探讨后膜骨架蛋白1a(Homer 1a)在小鼠脑缺血再灌注损伤中的作用。方法以Homer1a基因敲除小鼠为研究对象,复制脑缺血再灌注小鼠模型,根据行为学评分标准评价小鼠脑缺血再灌注的损伤程度。运用TTC染色法观察计算小鼠脑梗死体积。Tunel法检测脑缺血再灌注小鼠脑组织中细胞凋亡情况。GFAP法检测星形胶质细胞的增殖情况。Western blot检测小鼠脑组织中IL-1β、TNF-α、IL-6水平。结果实验组小鼠行为学评分高于脑缺血组,说明Homer 1a基因敲除小鼠脑缺血再灌注损伤较脑缺血组更为严重。实验组小鼠脑梗死体积与脑缺血组比较,差异有统计学意义(P<0.05),实验组增多。实验组小鼠脑组织细胞凋亡高于脑缺血组(P<0.05)。实验组和脑缺血组小鼠脑组织中星形胶质细胞数都高于正常组(P<0.05),而实验组小鼠脑组织中星型胶质细胞数量低于脑缺血组。实验组小鼠脑组织中IL-1β、TNF-α、IL-6表达水平均高于脑缺血组(P<0.05)。结论 Homer 1a基因敲除小鼠可以加重脑缺血再灌注后的损伤。Homer 1a可以减弱脑缺血再灌注损伤。

Rabbit model of radiation-induced lung injury

Objective:To explore the feasibility of establishing an animal model of chronic radiationinduced lung injury.Methods:Twenty-eight New Zealand white rabbits were randomly divided into 3 groups(the right lung irradiation group,the whole lung irradiation group and the control group).Animal model of radiation-induced lung injury was established b) highdoes radiotherapy in the irradiation groups,then all rabbits underwent CT and pathological examinations at 1.2.4.8.12.16 weeks,respectively after radiation.Results:Within 4 weeks of irradiation,some rabbits in the right lung irradiation group and whole lung irradiation group died. CT and pathological examinations all showed acute radiation pneumonitis.At 8-12 weeks after irradiation,CT scanning showed ground glass samples signs,patchy shadows and fibrotic stripes. Pathological examination showed the fibrosis pulmonary alveolar wall thickened obviously. Conclusions:The clinical animal model of chronic radiation-induced lung injury which corresponds to practical conditions in clinic can be successfully established.