Journal of Thrombosis and Thrombolysis

, Volume 28, Issue 1, pp 38–45

The influence of platelet activating factor on the effects of platelet agonists and antiplatelet agents in vitro


DOI: 10.1007/s11239-008-0239-5

Cite this article as:
Keating, F.K. & Schneider, D.J. J Thromb Thrombolysis (2009) 28: 38. doi:10.1007/s11239-008-0239-5


We assessed the effect of the intercellular mediator of inflammation, platelet activating factor (PAF), on platelet function. The interaction between PAF and the platelet agonists ADP, thrombin and convulxin was analyzed in vitro in whole blood with the use of flow cytometry and was further characterized with the use of receptor antagonists to PAF (ABT-491), P2Y1 (MRS-2179), and P2Y12 (cangrelor) as well as a monoclonal anti-PSGL-1 antibody (anti-CD162). Low concentrations of PAF (0.1 nM) synergistically augmented platelet activation induced by other agonists (P < 0.01). Augmentation by PAF was receptor mediated and did not require platelet–leukocyte interaction. With >99% inhibition of P2Y receptor-mediated platelet activation, greater than additive activation was still observed with the combination of ADP plus PAF. Accordingly, PAF synergistically augments platelet activation in response to ADP and thrombin, and the extent of inhibition exerted by P2Y receptor antagonists is decreased in the presence of PAF.


Platelets Platelet activating factor Adenosine diphosphate Coronary artery disease In vitro Platelet receptors Flow cytometry 

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of MedicineUniversity of Vermont - Fletcher Allen Health CareBurlingtonUSA

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