Caspase-3在兔體外循環(huán)心臟不停跳手術(shù)和停跳手術(shù)中不同表達(dá)的實驗研究
發(fā)布時間:2018-09-17 17:30
【摘要】:目的:研究在體外循環(huán)心臟不停跳手術(shù)與體外循環(huán)心臟停跳手術(shù)中,Caspase-3激活與表達(dá)的差異性以及對心肌凋亡程度的影響,為臨床工作提供新的思路。 方法:清潔健康新西蘭大白兔,,隨機(jī)分為2組(n=12),分別為實驗組(心臟不停跳組)和對照組(心臟停跳組)。對照組麻醉后常規(guī)插管轉(zhuǎn)機(jī),降溫至28-30℃時阻斷升主動脈,灌入15-20ml/kg4℃St.ThomasⅡ停跳液。并與15min及40min各半量灌注一次。第三次灌注后開始復(fù)溫,34℃時恢復(fù)灌注,使心臟復(fù)跳并行循環(huán),待生命體征平穩(wěn)后,停止體外循環(huán)。實驗組組常規(guī)插管,不阻斷主動脈,不降溫,轉(zhuǎn)機(jī)120分鐘后緩慢停止體外循環(huán)。實驗動物轉(zhuǎn)機(jī)后2小時仍存活視為實驗成功。迅速取出心臟采集心肌標(biāo)本,應(yīng)用熒光定量PCR測量兔心肌線粒體Caspase-3mRNA表達(dá)水平,TUNEL法觀察心肌細(xì)胞凋亡情況。 結(jié)果:(1)心肌細(xì)胞凋亡指數(shù):實驗組(4.24±1.39)較對照組(11.26±2.28)低 (2)實驗組Caspase-3的mRNA相對表達(dá)量(0.434±0.024)較對照組(1.058±0.081)低。 結(jié)論:(1)體外循環(huán)心臟停跳組Caspase-3的mRNA較心臟不停跳組高表達(dá),說明Caspase-3參與了心肌細(xì)胞凋亡,同時心臟不停跳手術(shù)能夠一定程度上保護(hù)心肌。 (2)體外循環(huán)心臟停跳組與體外循環(huán)心臟不停跳組均有細(xì)胞凋亡的發(fā)生,體外循環(huán)心臟停跳組的凋亡率明顯高于不停跳組。
[Abstract]:Objective: to study the difference of the activation and expression of Caspase-3 in cardiopulmonary bypass (CPB) and cardiopulmonary bypass (CPB) cardioplegia (CPB). Methods: clean and healthy New Zealand white rabbits were randomly divided into two groups: experimental group (heart beating group) and control group (cardiac arrest group). In the control group, the ascending aorta was blocked at 28-30 鈩
本文編號:2246622
[Abstract]:Objective: to study the difference of the activation and expression of Caspase-3 in cardiopulmonary bypass (CPB) and cardiopulmonary bypass (CPB) cardioplegia (CPB). Methods: clean and healthy New Zealand white rabbits were randomly divided into two groups: experimental group (heart beating group) and control group (cardiac arrest group). In the control group, the ascending aorta was blocked at 28-30 鈩
本文編號:2246622
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