Red blood cell-derived semaphorin 7A promotes thrombo-inflammation in myocardial ischemia-reperfusion injury through platelet GPIb

David Köhler, Tiago Granja, Julia Volz, Michael Koeppen, Harald F. Langer, Georg Hansmann, Ekaterina Legchenko, Tobias Geisler, Tamam Bakchoul, Claudia Eggstein, Helene A. Häberle, Bernhard Nieswandt and Peter Rosenberger ()
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David Köhler: University Hospital
Tiago Granja: University Hospital
Julia Volz: Institute of Experimental Biomedicine and Rudolf Virchow Center
Michael Koeppen: University Hospital
Harald F. Langer: University Hospital Lübeck
Georg Hansmann: Hannover Medical School
Ekaterina Legchenko: Hannover Medical School
Tobias Geisler: University Hospital
Tamam Bakchoul: University Hospital of Tübingen
Claudia Eggstein: University Hospital
Helene A. Häberle: University Hospital
Bernhard Nieswandt: Institute of Experimental Biomedicine and Rudolf Virchow Center
Peter Rosenberger: University Hospital

Nature Communications, 2020, vol. 11, issue 1, 1-12

Abstract: Abstract Myocardial ischemia is one of the leading health problems worldwide. Therapy consists of the restitution of coronary perfusion which is followed by myocardial inflammation. Platelet–neutrophil interaction is a crucial process during inflammation, yet its consequences are not fully understood. Here, we show that platelet–neutrophil complexes (PNCs) are increased in patients with acute myocardial infarction and that this is associated with increased levels of neuronal guidance protein semaphorin 7A (SEMA7A). To investigate this further, we injected WT animals with Sema7a and found increased infarct size with increased numbers of PNCs. Experiments in genetically modified animals identify Sema7a on red blood cells to be crucial for this condition. Further studies revealed that Sema7a interacts with the platelet receptor glycoprotein Ib (GPIb). Treatment with anti-Sema7a antibody protected from myocardial tissue injury. In summary, we show that Sema7a binds to platelet GPIb and enhances platelet thrombo-inflammatory activity, aggravating post-ischemic myocardial tissue injury.

Date: 2020
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DOI: 10.1038/s41467-020-14958-x

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