The transient, reversible blockade of electron transport (BET) during ischemia or at the onset of reperfusion protects mitochondria and decreases cardiac injury. Apoptosis inducing factor (AIF) is located within the mitochondrial intermembrane space. A release of AIF from mitochondria into cytosol and nucleus triggers caspase-independent cell death. We asked if BET prevents the loss of AIF from mitochondria as a mechanism of protection in the buffer perfused heart. BET during ischemia with amobarbital, a rapidly reversible inhibitor of mitochondrial complex I, attenuated a release of AIF from mitochondria into cytosol, in turn decreasing the formation of cleaved and activated PARP-1. These results suggest that BET-mediated protection may occur through prevention of the loss of AIF from mitochondria during ischemia-reperfusion. In order to further clarify the role of mitochondrial AIF in BET-mediated protection, Harlequin (Hq) mice, a genetic model with mitochondrial AIF deficiency, were used to test whether BET could still decrease cell injury in Hq mouse hearts during reperfusion. BET during ischemia protected Hq mouse hearts against ischemia-reperfusion injury and improved mitochondrial function in these hearts during reperfusion. Thus, cardiac injury can still be decreased in the presence of down-regulated mitochondrial AIF content. Taken together, BET during ischemia protects both hearts with normal mitochondrial AIF content and hearts with mitochondrial AIF deficiency. Although preservation of mitochondrial AIF content plays a key role in reducing cell injury during reperfusion, the protection derived from the BET is not fully dependent on AIF-driven mechanisms. (C) 2013 Elsevier Inc. All rights reserved.
基金：
American Heart Association [11SDG5120011]; Office of Research and Development, Medical Research Service, Department of Veterans Affairs; Pauley Heart Center, Virginia Commonwealth University
第一作者单位：[1]Virginia Commonwealth Univ, Dept Internal Med, Div Cardiol, Richmond, VA 23298 USA[5]Huazhong Univ Sci & Technol, Dept Anesthesiol, Tongji Hosp, Wuhan 430030, Peoples R China
通讯作者：
通讯机构：[1]Virginia Commonwealth Univ, Dept Internal Med, Div Cardiol, Richmond, VA 23298 USA[*1]Virginia Commonwealth Univ, Dept Internal Med, Div Cardiol, Med Coll Virginia Campus, Richmond, VA 23298 USA
推荐引用方式(GB/T 7714)：
Xu Aijun,Szczepanek Karol,Hu Ying,et al.Cardioprotection by modulation of mitochondrial respiration during ischemia-reperfusion: Role of apoptosis-inducing factor[J].BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS.2013,435(4):627-633.doi:10.1016/j.bbrc.2013.05.033.
APA：
Xu, Aijun,Szczepanek, Karol,Hu, Ying,Lesnefsky, Edward J.&Chen, Qun.(2013).Cardioprotection by modulation of mitochondrial respiration during ischemia-reperfusion: Role of apoptosis-inducing factor.BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS,435,(4)
MLA：
Xu, Aijun,et al."Cardioprotection by modulation of mitochondrial respiration during ischemia-reperfusion: Role of apoptosis-inducing factor".BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS 435..4(2013):627-633
