背景
心脏移植是一种用于治疗严重冠心病等终末期心脏病患者的有效的外科手段,成功的器官保存是心脏移植手术成功的必要前提。然而,目前临床上心脏的低温保存时间局限在4至6h以内,这与其它器官如肝、肾、胰的保存时间相比要短的多。如何有效地延长供心的保存时间是当前迫切需要解决的问题。研究发现在Celsior心脏保存液中添加二氮嗪,能促进长时低温保存后心功能的恢复并减少心肌细胞凋亡。热休克蛋白90(Heat shock protein 90,Hsp90)是一类高度保守的蛋白质家族的成员之一。Hsp90表达增加可诱导细胞保护作用,其机制被认为与其抗凋亡作用相关。然而,Hsp90是否参与了二氮嗪对抗低温保存诱导的心肌细胞凋亡作用尚不明了。
目的
研究Hsp90是否参与了二氮嗪对抗低温保存诱导的心功能下降,同时探究其可能机制。
方法
(1)低温保存模型的建立及心功能测定:离体大鼠心脏于Langendorff恒压灌注装置上平衡后,经主动脉根部灌注40C的Celsior'心麻痹液,灌注时间控制在3min以内,心脏表面同时降温,待心脏停跳后分别置于不同成分的心麻痹液中(4℃)保存,3...
【英文摘要】
Background
Heart transplantation is a surgical transplant procedure performed on patients with end-stage heart failure or severe coronary artery disease. Successful organ preservation is the premise for clinical organ transplantation. However, hypothermic preservation of the heart has a limit of about 4-6 h, which is much lower than that for the liver, kidney, and pancreas.Prolonged donor heart preservation becomes more important in cardiovascular surgery. We have reported that diazoxide as a supplemen...