Frontiers in Immunology (Feb 2023)

Vitronectin promotes immunothrombotic dysregulation in the venular microvasculature

  • Bernd Uhl,
  • Bernd Uhl,
  • Florian Haring,
  • Florian Haring,
  • Julia Slotta-Huspenina,
  • Joshua Luft,
  • Joshua Luft,
  • Vera Schneewind,
  • Vera Schneewind,
  • Jonas Hildinger,
  • Jonas Hildinger,
  • Zhengquan Wu,
  • Zhengquan Wu,
  • Katja Steiger,
  • Bojan Smiljanov,
  • Bojan Smiljanov,
  • Aarif M. N. Batcha,
  • Aarif M. N. Batcha,
  • Oliver T. Keppler,
  • Oliver T. Keppler,
  • Johannes C. Hellmuth,
  • Johannes C. Hellmuth,
  • Tobias Lahmer,
  • Konrad Stock,
  • Bernhard G. Weiss,
  • Martin Canis,
  • Konstantin Stark,
  • Thomas Bromberger,
  • Markus Moser,
  • Christian Schulz,
  • Wilko Weichert,
  • Gabriele Zuchtriegel,
  • Gabriele Zuchtriegel,
  • Christoph A. Reichel,
  • Christoph A. Reichel

DOI
https://doi.org/10.3389/fimmu.2023.1078005
Journal volume & issue
Vol. 14

Abstract

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Microvascular immunothrombotic dysregulation is a critical process in the pathogenesis of severe systemic inflammatory diseases. The mechanisms controlling immunothrombosis in inflamed microvessels, however, remain poorly understood. Here, we report that under systemic inflammatory conditions the matricellular glycoproteinvitronectin (VN) establishes an intravascular scaffold, supporting interactions of aggregating platelets with immune cells and the venular endothelium. Blockade of the VN receptor glycoprotein (GP)IIb/IIIa interfered with this multicellular interplay and effectively prevented microvascular clot formation. In line with these experimental data, particularly VN was found to be enriched in the pulmonary microvasculature of patients with non-infectious (pancreatitis-associated) or infectious (coronavirus disease 2019 (COVID-19)-associated) severe systemic inflammatory responses. Targeting the VN-GPIIb/IIIa axis hence appears as a promising, already feasible strategy to counteract microvascular immunothrombotic dysregulation in systemic inflammatory pathologies.

Keywords