Calcium ionophore-activated platelets induce eosinophil extracellular trap formation

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  • Sim Myeong Seong
    Department of BionanoTechnology, Hanyang University
  • Kim Hye Jeong
    Department of BionanoTechnology, Hanyang University
  • Bae Ikhyeon
    Department of Molecular and Life Sciences, College of Science and Convergence Technology, Hanyang University
  • Kim Chun
    Department of Molecular and Life Sciences, College of Science and Convergence Technology, Hanyang University
  • Chang Hun Soo
    Department of Anatomy and BK21 FOUR Project, College of Medicine, Soonchunhyang University
  • Choi Youngwoo
    Department of Allergy and Clinical Immunology, Ajou University School of Medicine
  • Lee Dong-Hyun
    Department of Allergy and Clinical Immunology, Ajou University School of Medicine
  • Park Hae-Sim
    Department of Allergy and Clinical Immunology, Ajou University School of Medicine
  • Chung Il Yup
    Department of Molecular and Life Sciences, College of Science and Convergence Technology, Hanyang University

抄録

<p>Background: Platelets play a modulatory role in inflammatory response by secreting a vast array of granules and disintegrating into membrane-bound microparticles upon activation. The interplay between eosinophils and platelets is postulated to be implicated in the pathology of allergic airway inflammation. In this study, we investigated whether activated platelets can induce eosinophil extracellular trap (EET) formation, a cellular process by which activated eosinophils release net-like DNA fibers.</p><p>Methods: Platelets were stimulated with the calcium ionophore, A23187, and the platelet agonists, thrombin and adenosine diphosphate (ADP). Platelet cultures were fractionated into conditioned medium (CM) and pellet, which were then overlaid on eosinophils to examine EET formation.</p><p>Results: The CM and pellet from A23187-activated platelets stimulated eosinophils to generate EET, whereas those from thrombin- or ADP-activated platelets failed to induce such generation. The EET-inducing activity of the A23187-activated platelet culture was linearly proportional to the number of activated platelets. Interestingly, while EET formation induced by the direct stimulation of eosinophils with A23187 was NADPH oxidase (NOX)-dependent, EET formation induced by A23187-activated platelets was NOX-independent and significantly inhibited by necroptosis pathway inhibitors.</p><p>Conclusions: Activated platelets and their products may induce EET formation, thereby potentiating their role in eosinophilic airway inflammation.</p>

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