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Small‐size platelet microparticles trigger platelet and monocyte functionality and modulate thrombogenesis via P‐selectin
Author(s) -
MontoroGarcía Silvia,
Shantsila Eduard,
HernándezRomero Diana,
Jover Eva,
Valdés Mariano,
Marín Francisco,
Lip Gregory Y. H.
Publication year - 2014
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/bjh.12913
Subject(s) - platelet , monocyte , platelet activation , p selectin , flow cytometry , thrombin , degranulation , whole blood , chemistry , cd63 , immunology , medicine , receptor , biochemistry , microrna , microvesicles , gene
Summary This study aimed to examine the mechanisms of cellular activation by small‐size platelet microparticles ( sPMP ) and to present the performance of high‐resolution flow cytometry for the analysis of subcellular entities from different origins. Plasma counts of sPMP were analysed in coronary artery disease patients ( n = 40) and healthy controls ( n = 40). The effect of sPMP and platelet debris (PD) in pathophysiologically relevant doses on platelet and monocyte activation parameters and thrombogenesis was investigated via flow cytometry and thromboelastometry. New generation flow cytometry identifies differences in size, levels and surface molecules of sPMP derived in the absence of stimulus, thrombin activation and platelet disruption. Addition of sPMP resulted in platelet degranulation and P‐selectin redistribution to the membrane ( P = 0·019) in a dose and time‐dependent manner. Blood clotting time decreased after addition of sPMP ( P = 0·005), but was not affected by PD. Blocking P‐selectin (CD62P) in sPMP markedly reverted the effect on thrombus kinetics ( P = 0·035). Exposure to sPMP stimulated monocyte expression of intercellular adhesion molecule‐1 ( P < 0·03) and decreased monocyte interleukin‐6 receptor density ( P < 0·01). These results implicate sPMP as a direct source of downstream platelet and monocyte activation. In pathological coronary artery disease conditions, higher levels of sPMP favour a prothrombotic state, partly through P‐selectin expression.