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The Platelet-Virus Axis in Human Disease.

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Platelets are active immune cells in viral infections, not passive bystanders. They engage in a platelet-virus axis influencing disease severity, thrombosis, and immune responses, offering potential therapeutic targets.

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Area of Science:

  • Immunology
  • Hematology
  • Virology

Background:

  • Platelets were traditionally considered passive in hemostasis.
  • Emerging evidence highlights platelets as active immune and inflammatory participants.
  • Platelets play a crucial role in host-pathogen interactions, particularly in viral infections.

Purpose of the Study:

  • To review the molecular and cellular mechanisms of virus-platelet interactions.
  • To emphasize the role of these interactions in immune-thrombosis, endothelial injury, and organ dysfunction.
  • To discuss the clinical implications of platelet dysregulation in viral infections as biomarkers and therapeutic targets.

Main Methods:

  • Literature review synthesizing current evidence on virus-platelet interactions.
  • Analysis of molecular pathways involved in platelet activation and immune modulation during viral infections.
  • Examination of clinical data linking platelet behavior to viral disease severity and outcomes.

Main Results:

  • Platelets actively interact with viruses (e.g., SARS-CoV-2, HIV, dengue), influencing viral spread and immune activation.
  • Virus-platelet interactions lead to platelet activation, altered function, and clearance, contributing to thrombocytopenia and hypercoagulability.
  • Platelets act as immune sentinels, releasing mediators and forming aggregates that modulate innate and adaptive immunity.

Conclusions:

  • The platelet-virus axis is central to the thrombo-inflammatory phenotype of viral diseases.
  • Platelet dysregulation is a significant factor in viral pathogenesis, causing endothelial injury and organ dysfunction.
  • Targeting platelet function presents a promising strategy for managing severe viral infections and their complications.