作者:Wen Zhang、Simin Bi、Ping Li、Jihong Liu、Chunmiao Zhou、Xin Wang、Wei Zhang、Hui Wang、Bo Tang
DOI:10.1021/acs.analchem.0c05220
日期:2021.4.13
Hepatic ischemia-reperfusion (IR) injury is a severe pathophysiological event during liver surgery or transplantation and could lead to liver failure or even death. The energy supply of mitochondria plays an essential role in preventing IR injury. Mitochondrial DNA (mtDNA) is involved in maintaining the balance of energy by participating in an oxidative phosphorylation process. However, the exact relationship between IR and mtDNA remains unclear by reason of the lack of an accurate real-time analysis method. Herein, we fabricated a mitochondria-targeting fluorescent probe (mtDNA-BP) to explore mtDNA stability and supervise the changes in mtDNA in IR liver. By virtue of pyridinium electropositivity and suitable size, mtDNA-BP could accumulate in mitochondria and insert into the mtDNA groove, which made mtDNA-BP fluoresce strongly. This is attributed to the reduction of the intramolecular rotation energy loss that is restricted by DNA. By in situ fluorescence imaging, we observed in real time that mtDNA damage was aggravated by deteriorating IR injury, so the ROS-mtDNA-mediated IR damage signal pathway was speculated. Furthermore, on the basis of mtDNA-BP real-time response capability for mtDNA, we established a drug-screening method for inhibiting IR injury and found superior therapeutic performance of two potential drugs: pioglitazone and salidroside. This work contributes to our understanding of mtDNA-related disease and provides a new drug analysis method.
肝脏缺血-再灌注(IR)损伤是肝脏手术或移植期间发生的严重生理病理事件,可能导致肝功能衰竭甚至死亡。线粒体的能量供应在防止IR损伤中起着至关重要的作用。线粒体DNA(mtDNA)通过参与氧化磷酸化过程,参与维持能量平衡。然而,由于缺乏准确的实时分析方法,IR与mtDNA之间的确切关系仍不清楚。在此,我们制造了一种靶向线粒体的荧光探针(mtDNA-BP),以探索mtDNA的稳定性并监督IR肝脏中mtDNA的变化。凭借吡啶阳离子的优良电正性和合适的尺寸,mtDNA-BP能够在线粒体中积累并插入mtDNA的凹槽,从而使mtDNA-BP强烈荧光。这是由于DNA限制了分子内旋转能量损失的减少。通过原位荧光成像,我们实时观察到mtDNA损伤因IR损伤加重而加剧,因此推测出了一条以ROS-mtDNA为介导的IR损伤信号通路。此外,基于mtDNA-BP对mtDNA的实时响应能力,我们建立了一种抑制IR损伤的药物筛选方法,并发现了两种潜在药物的优越治疗效果:吡格列酮和沙利度胺。这项工作有助于我们对mtDNA相关疾病的理解,并提供了一种新的药物分析方法。