1. Ferroptotic cell death and TLR4/Trif signaling initiate neutrophil recruitment after heart transplantation.
- Author
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Li W, Feng G, Gauthier JM, Lokshina I, Higashikubo R, Evans S, Liu X, Hassan A, Tanaka S, Cicka M, Hsiao HM, Ruiz-Perez D, Bredemeyer A, Gross RW, Mann DL, Tyurina YY, Gelman AE, Kagan VE, Linkermann A, Lavine KJ, and Kreisel D
- Subjects
- Adaptor Proteins, Vesicular Transport genetics, Animals, Cyclohexylamines pharmacology, Ferroptosis drug effects, Ferroptosis genetics, Inflammation drug therapy, Inflammation genetics, Inflammation immunology, Inflammation pathology, Mice, Mice, Knockout, Myocardial Reperfusion Injury drug therapy, Myocardial Reperfusion Injury genetics, Myocardial Reperfusion Injury pathology, Myocardium pathology, Neutrophils pathology, Phenylenediamines pharmacology, Signal Transduction drug effects, Signal Transduction genetics, Toll-Like Receptor 4 genetics, Ventricular Function, Left drug effects, Ventricular Function, Left genetics, Ventricular Function, Left immunology, Adaptor Proteins, Vesicular Transport immunology, Ferroptosis immunology, Heart Transplantation, Myocardial Reperfusion Injury immunology, Myocardium immunology, Neutrophil Infiltration, Neutrophils immunology, Signal Transduction immunology, Toll-Like Receptor 4 immunology
- Abstract
Non-apoptotic forms of cell death can trigger sterile inflammation through the release of danger-associated molecular patterns, which are recognized by innate immune receptors. However, despite years of investigation the mechanisms which initiate inflammatory responses after heart transplantation remain elusive. Here, we demonstrate that ferrostatin-1 (Fer-1), a specific inhibitor of ferroptosis, decreases the level of pro-ferroptotic hydroperoxy-arachidonoyl-phosphatidylethanolamine, reduces cardiomyocyte cell death and blocks neutrophil recruitment following heart transplantation. Inhibition of necroptosis had no effect on neutrophil trafficking in cardiac grafts. We extend these observations to a model of coronary artery ligation-induced myocardial ischemia reperfusion injury where inhibition of ferroptosis resulted in reduced infarct size, improved left ventricular systolic function, and reduced left ventricular remodeling. Using intravital imaging of cardiac transplants, we uncover that ferroptosis orchestrates neutrophil recruitment to injured myocardium by promoting adhesion of neutrophils to coronary vascular endothelial cells through a TLR4/TRIF/type I IFN signaling pathway. Thus, we have discovered that inflammatory responses after cardiac transplantation are initiated through ferroptotic cell death and TLR4/Trif-dependent signaling in graft endothelial cells. These findings provide a platform for the development of therapeutic strategies for heart transplant recipients and patients, who are vulnerable to ischemia reperfusion injury following restoration of coronary blood flow.
- Published
- 2019
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