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Platelet ectosomes (Ecto) shed during storage can suppress natural killer (NK) cell function by increasing TGF-β1. This suggests platelet transfusions may reduce immune defense, increasing infection risk.

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Area of Science:

  • Immunology
  • Cell Biology
  • Transfusion Medicine

Background:

  • Platelet (PLT) transfusions are vital but linked to increased infection risk.
  • Stored PLTs shed ectosomes (Ecto) expressing immunomodulatory molecules.
  • Previous studies showed PLT-Ecto modulate macrophages and T cells, but NK cell effects were unknown.

Purpose of the Study:

  • To investigate the impact of PLT-derived ectosomes (PLT-Ecto) on natural killer (NK) cell function.
  • To elucidate the mechanisms underlying PLT-Ecto mediated modulation of NK cells.

Main Methods:

  • Purified NK cells and peripheral blood mononuclear cells (PBMCs) were exposed to PLT-Ecto.
  • NK cell surface receptor expression, degranulation (CD107a), and cytokine production (IFN-γ) were measured.
  • Effects of anti-TGF-β1 neutralizing antibodies and miR-183 modulation were assessed.

Main Results:

  • PLT-Ecto significantly reduced NK cell expression of activating receptors (NKG2D, NKp30, DNAM-1) and impaired NK cell function.
  • TGF-β1 from PLT-Ecto mediated these suppressive effects, partly via upregulation of miR-183 and reduced DAP12.
  • Erythrocyte Ecto had no effect, while polymorphonuclear cell Ecto also inhibited NK cells via TGF-β1.

Conclusions:

  • PLT-Ecto inhibit NK cell effector function in a TGF-β1-dependent manner.
  • This NK cell suppression suggests a potential mechanism for increased infection risk in PLT transfusion recipients.