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Platelets mediate systemic shock via immune complexes (ICs) by releasing serotonin. Activated platelets recirculate after degranulation, impacting inflammatory diseases like sepsis and anaphylaxis.

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Area of Science:

  • Immunology
  • Hematology
  • Pathology

Background:

  • Platelets are increasingly recognized for their role in immunity beyond hemostasis.
  • Circulating immune complexes (ICs) are implicated in various inflammatory conditions.

Purpose of the Study:

  • To investigate platelet activation and responses to systemic ICs in the absence of vascular injury.
  • To elucidate the mechanisms underlying IC-induced systemic shock mediated by platelets.

Main Methods:

  • Investigated platelet activation via Fcγ receptor IIA and outside-in signaling through αIIbβ3.
  • Assessed the role of serotonin release from platelet-dense granules.
  • Observed platelet sequestration in lungs and the blood-brain barrier.
  • Utilized mouse models, including those lacking peripheral serotonin.

Main Results:

  • Platelet activation by ICs, requiring Fcγ receptor IIA, induced systemic shock.
  • IC-driven shock depended on serotonin release, mediated by αIIbβ3 and fibrinogen.
  • Platelets sequestered in lungs and the blood-brain barrier, and also in mice lacking serotonin.
  • Degranulated platelets recirculated, becoming ineffective in promoting subsequent shock but still sequestering.

Conclusions:

  • Platelets are critical mediators of inflammatory responses to ICs, relevant to sepsis, viremia, and anaphylaxis.
  • Recirculating, degranulated platelets are longer-lived than expected, potentially explaining platelet count changes in IC-driven diseases.