摘要
目的 :探讨急性缺血诱导大鼠心肌细胞凋亡的时间演变和空间分布规律。方法 :以DNA电泳和TUNEL分析检测SD大鼠心肌的细胞凋亡情况。结果 :缺血 2h开始出现DNA梯形条带和TUNEL阳性细胞 ,DNA条带和凋亡指数随缺血时间延长而显著增加 (P <0 0 1)。TUNEL阳性心肌细胞在缺血区散在分布 ,缺血边缘区凋亡指数显著高于缺血中央区 (P <0 0 5 ) ,缺血区内膜下凋亡指数显著高于外膜下 (P <0 0 1)。结论 :在本实验设定的时间范围内 ,急性缺血诱导的心肌细胞凋亡与缺血时间具有时效关系 ;调亡的心肌细胞在缺血区散在分布 ,以缺血区两侧边缘和内膜下心肌多见。
AIM: Myocyte apoptosis in rats can be induced by acute ischemia, but time course and distribution of myocyte apoptosis were unclear.METHODS:DNA agarose gel electrophoresis and TdT-mediated dUTP nick end-labling(TUNEL) assay were performed to evaluate apoptosis in mycardium exposed to 45 minutes, 2 hours, 6 hours, 12 hours ischemia and sham-operated rats in vivo.RESULTS: DNA ladders were clearly visible in agarose gel of DNA from ischemic myocardium exposed to 2 hours, 6 hours and 12 hours ischemia, and DNA ladders became more apparent with increasing duration of ischemia. TUNEL positive cells with apoptotic morphologic characters were present in above ischemia time, and apoptotic index increased with increasing ischemia time. The majority of TUNEL positive cells were myocytes. Apoptotic index was higher in subendocardium than in subepicardium(P<0.01), while higher in border ischemia region than in the central ischemia area(P<0.05).CONCLUSION: A time-effect relation existed between the number of apoptosis and the time range of supposed time; Apoptotic myocytes scattered in the ischemic myocardium, mainly localized at subendocardium and ischemic border.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2000年第11期1221-1224,I003,共4页
Chinese Journal of Pathophysiology
