摘要
目的 评价氨基胍对大鼠急性心肌缺血时细胞凋亡的影响.方法 健康成年雄性SD大鼠30只,体重250 ～ 290 g,采用随机数字表法分为3组（n=10）：假手术组（S组）、心肌缺血损伤组（Ⅰ组）和氨基胍组（AG组）.采用结扎大鼠左冠状动脉前降支的方法,制备急性心肌缺血损伤模型.AG组于缺血6h时腹腔注射氨基胍100 mg/kg,Ⅰ组给予等容量生理盐水.于氨基胍给药后3h开胸取心脏.采用TUNEL法测定心肌细胞凋亡率,采用免疫组化法测定心肌细胞Bcl-2和Bax蛋白的表达,并计算Bcl-2/Bax比值;光镜下观察心肌组织病理学结果.结果 与S组比较,Ⅰ组心肌细胞凋亡率升高,Bax蛋白表达上调,Bcl-2蛋白表达下调,Bcl-2/Bax比值降低（P＜0.01）;与Ⅰ组比较,AG组心肌细胞凋亡率降低,Bax蛋白表达下调,Bcl-2蛋白表达上调,Bcl-2/Bax比值升高（P＜0.01）.AG组心肌病理学损伤程度较Ⅰ组减轻.结论 氨基胍可抑制心肌细胞凋亡,有助于减轻大鼠急性心肌缺血损伤.
Objective To evaluate the effect of aminoguanidine on cell apoptosis induced by acute myocardial ischemia in rats.Methods Thirty adult male Sprague-Dawley rats,weighing 250-290 g,were randomly divided into 3 groups （n =10 each）：sham operation group （group S）,myocardial ischemia group （group Ⅰ）,and aminoguanidine group （group AG）.The model of acute myocardial ischemia was established by ligating the left anterior descending branch of the coronary artery of rats anesthetized with chloral hydrate.Aminoguanidine 100 mg/kg was intraperitoneally administrated at 6 h of ischemia in AG group,while the equal volume of normal saline was given instead of aminoguanidine in group Ⅰ.The chest was opened at 3 h after aminoguanidine administration and hearts were quickly removed for detection of apoptosis in cardiomyocytes （by TUNEL） and expression of Bcl-2 and Bax in cardiomyocytes （by immuno-histochemistry）,and for microscopic examination with light microscope.Apoptotic rate was calculated.Results Compared with group S,the apoptotic rate was significantly increased,the expression of Bax was up-regulated,and the expression of Bcl-2 was downregulated and the ratio of Bcl-2/Bax was decreased in group Ⅰ.Compared with group Ⅰ,the apoptotic rate was significantly decreased,the expression of Bax was down-regulated,and the expression of Bcl-2 was up-regulated,and the ratio of Bcl-2/Bax was increased in group AG.The pathological changes of myocardial cells were significantly attenuated in AG group as compared with group Ⅰ.Conclusion Amionguanidine can inhibit apoptosis in cardiomyocytes and is helpful in mitigating injury induced by acute myocardial ischemia in rats.
出处
《中华麻醉学杂志》
CAS
CSCD
北大核心
2014年第11期1393-1395,共3页
Chinese Journal of Anesthesiology
基金
河北省重点基础研究项目（13967602D）
关键词
胍类
心肌缺血
细胞凋亡
Guanidines
Myocardical ischemia
Apopotosis
作者简介
通信作者：张建新，050021石家庄市，河北省医学科学院药物研究所，Email：zhangix100@163．com
