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The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
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Related Experiment Video

Updated: Apr 7, 2026

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Platelets and Their Interactions with Other Immune Cells.

Fong W Lam1,2, K Vinod Vijayan1,3,2,4, Rolando E Rumbaut1,3,2

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Platelets, crucial for blood clotting, also play significant roles in inflammation and immunity. This review explores their immune functions and interactions with other immune cells.

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Area of Science:

  • Hematology
  • Immunology
  • Physiology

Background:

  • Platelets are primarily known for their role in hemostasis and thrombosis.
  • Emerging evidence highlights significant functions of platelets beyond blood clotting.
  • Their role in immunity and inflammation is increasingly recognized but not widely accepted in physiology.

Purpose of the Study:

  • To review the multifaceted roles of platelets in inflammation and immune responses.
  • To elucidate the interactions between platelets and other immune cells.
  • To provide examples of the functional consequences of platelet-immune cell interactions.

Main Methods:

  • Literature review of studies on platelet function in immunity and inflammation.
  • Analysis of research detailing platelet interactions with leukocytes, dendritic cells, and other immune mediators.
  • Synthesis of findings to illustrate the impact of these interactions on physiological and pathological processes.

Main Results:

  • Platelets actively participate in inflammatory pathways and modulate immune cell activity.
  • Specific examples of platelet interactions with neutrophils, monocytes, lymphocytes, and dendritic cells are discussed.
  • These interactions influence pathogen clearance, autoimmune responses, and tissue repair.

Conclusions:

  • Platelets possess significant immune functions, acting as key mediators in inflammation and immunity.
  • Recognizing platelets as immune cells offers new perspectives in physiology and medicine.
  • Further research into platelet-immune cell crosstalk can lead to novel therapeutic strategies.