Cellular and Molecular Life Sciences

, Volume 67, Issue 4, pp 499–511

Platelets and innate immunity

Multi-author Review

DOI: 10.1007/s00018-009-0205-1

Cite this article as:
Semple, J.W. & Freedman, J. Cell. Mol. Life Sci. (2010) 67: 499. doi:10.1007/s00018-009-0205-1


Although platelets are best known as primary mediators of hemostasis, this function intimately associates them with inflammatory processes, and it has been increasingly recognized that platelets play an active role in both innate and adaptive immunity. For example, platelet adhesive interactions with leukocytes and endothelial cells via P-selectin can lead to several pro-inflammatory events, including leukocyte rolling and activation, production of cytokine cascades, and recruitment of the leukocytes to sites of tissue damage. Superimposed on this, platelets express immunologically-related molecules such as CD40L and Toll-like receptors that have been shown to functionally modulate innate immunity. Furthermore, platelets themselves can interact with microorganisms, and several viruses have been shown to cross-react immunologically with platelet antigens. This review discusses the central role that platelets play in inflammation, linking them with varied pathological conditions, such as atherosclerosis, sepsis, and immune thrombocytopenic purpura, and suggests that platelets also act as primary mediators of our innate defences.


Platelets Innate immunity Toll-like receptors CD40L Inflammation 

Copyright information

© Birkhäuser Verlag, Basel/Switzerland 2009

Authors and Affiliations

  1. 1.Keenan Research Centre, Li Ka Shing Knowledge InstituteSt. Michael’s HospitalTorontoCanada
  2. 2.Department of PharmacologyUniversity of TorontoTorontoCanada
  3. 3.Department of MedicineUniversity of TorontoTorontoCanada
  4. 4.Department of Laboratory Medicine and PathobiologyUniversity of TorontoTorontoCanada
  5. 5.Canadian Blood ServicesTorontoCanada
  6. 6.The Toronto Platelet Immunobiology GroupTorontoCanada

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