TY - JOUR
T1 - FLow-induced protrusions (FLIPRs)
T2 - A platelet-derived platform for the retrieval of microparticles by monocytes and neutrophils
AU - Tersteeg, C.
AU - Heijnen, H.F.G.
AU - Eckly, A.
AU - Pasterkamp, G.
AU - Urbanus, R.T
AU - Maas, C.
AU - Höfer, I.E.
AU - Nieuwland, R.
AU - Farndale, R.W.
AU - Gachet, C.
AU - de Groot, P.G.
AU - Roest, M.
PY - 2014/2/28
Y1 - 2014/2/28
N2 - RATIONALE:: Platelets are the most important cells in the primary prevention of blood loss after injury. In addition, platelets are at the interface between circulating leukocytes and the (sub)endothelium regulating inflammatory responses. OBJECTIVE:: Our aim was to study the dynamic process that leads to the formation of procoagulant and proinflammatory platelets under physiological flow. METHODS AND RESULTS:: In the present study, we describe the formation of extremely long, negatively charged membrane strands that emerge from platelets adhered under flow. These flow-induced protrusions (FLIPRs) are formed in vitro on different physiological substrates and are also detected in vivo in a mouse carotid injury model. FLIPRs are formed downstream the adherent and activated platelets and reach lengths of 250 μm. FLIPR formation is shear-dependent and requires cyclophilin D, calpain, and Rac1 activation. It is accompanied by a disassembly of the F-actin and microtubule organization. Monocytes and neutrophils roll over FLIPRs in a P-selectin/P-selectin glycoprotein ligand-1-dependent manner, retrieving fragments of FLIPRs as microparticles on their surface. Consequently, monocytes and neutrophils become activated, as demonstrated by increased CD11b expression and L-selectin shedding. CONCLUSIONS:: The formation of long platelet membrane extensions, such as the ones presented in our flow model, may pave the way to generate an increased membrane surface for interaction with monocytes and neutrophils. Our study provides a mechanistic model for platelet membrane transfer and the generation of monocyte/neutrophil-microparticle complexes. We propose that the formation of FLIPRs in vivo contributes to the well-established proinflammatory function of platelets and platelet-derived microparticles. © 2014 American Heart Association, Inc.
AB - RATIONALE:: Platelets are the most important cells in the primary prevention of blood loss after injury. In addition, platelets are at the interface between circulating leukocytes and the (sub)endothelium regulating inflammatory responses. OBJECTIVE:: Our aim was to study the dynamic process that leads to the formation of procoagulant and proinflammatory platelets under physiological flow. METHODS AND RESULTS:: In the present study, we describe the formation of extremely long, negatively charged membrane strands that emerge from platelets adhered under flow. These flow-induced protrusions (FLIPRs) are formed in vitro on different physiological substrates and are also detected in vivo in a mouse carotid injury model. FLIPRs are formed downstream the adherent and activated platelets and reach lengths of 250 μm. FLIPR formation is shear-dependent and requires cyclophilin D, calpain, and Rac1 activation. It is accompanied by a disassembly of the F-actin and microtubule organization. Monocytes and neutrophils roll over FLIPRs in a P-selectin/P-selectin glycoprotein ligand-1-dependent manner, retrieving fragments of FLIPRs as microparticles on their surface. Consequently, monocytes and neutrophils become activated, as demonstrated by increased CD11b expression and L-selectin shedding. CONCLUSIONS:: The formation of long platelet membrane extensions, such as the ones presented in our flow model, may pave the way to generate an increased membrane surface for interaction with monocytes and neutrophils. Our study provides a mechanistic model for platelet membrane transfer and the generation of monocyte/neutrophil-microparticle complexes. We propose that the formation of FLIPRs in vivo contributes to the well-established proinflammatory function of platelets and platelet-derived microparticles. © 2014 American Heart Association, Inc.
KW - Flow
KW - microparticles
KW - platelet adhesion
KW - proinflammatory platelets
KW - shear
UR - http://www.scopus.com/inward/record.url?scp=84895921799&partnerID=8YFLogxK
U2 - 10.1161/CIRCRESAHA.114.302361
DO - 10.1161/CIRCRESAHA.114.302361
M3 - Article
C2 - 24406984
SN - 0009-7330
VL - 114
SP - 780
EP - 791
JO - Circulation Research
JF - Circulation Research
IS - 5
ER -