title: Quantitative proteomics analysis of platelet-derived microparticles reveals distinct protein signatures when stimulated by different physiological agonists.
abstract: Platelet-derived MPs (PMPs) are a heterogeneous population of microvesicles released from platelets upon activation and apoptosis. Different platelet activations may affect PMP protein profiles and roles in intercellular communication. Here, we performed a quantitative proteomics study to characterize the protein content of PMPs generated by four differentially activated platelet samples. We selected known physiological agonists for platelet activation such as ADP, thrombin and collagen. Thrombin, which is mostly used to generate PMPs in vitro, was set as control. Platelets were activated by following a known agonist strength scale in which ADP was the weakest activation and thrombin and collagen stimulations were the strongest ones. Our proteomic analysis allowed the quantification of 3383 proteins, of which 428 membrane and 131 soluble proteins were found as significantly different in at least one of the analyzed conditions. Activation with stronger agonists led to the enrichment of proteins related to platelet activation in PMPs. In addition, proteins involved in platelet degranulation and proteins from the electron transport chain were less abundant in PMPs when stronger activation was used. Collectively, our data describe the most detailed characterization of PMPs after platelet physiological activation. Furthermore, we show that PMP protein content is highly dependent on the type of physiological agonist involved in platelet stimulation.
  
  
  CONCLUSIONS
  Platelet-derived MPs (PMPs) are a population of vesicles generated upon platelet activation by various stimuli known to be involved in several physiological and pathological processes. This manuscript investigates the protein profile of PMPs obtained by performing four different activation protocols using mass spectrometry-based quantitative proteomics. By following a known physiological agonist strength scale our findings suggest a biological link between agonist strength and proteins associated to platelet mediated processes such as activation and degranulation. These data may provide new insights for understanding PMP biological role and formation.
authors.affiliation: Department of Chemistry, University of Parma, 43124 Parma, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Milioli
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark.
authors.forename: Maria
authors.initials: M
authors.lastname: Ibáñez-Vea
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark.
authors.forename: Simone
authors.initials: S
authors.lastname: Sidoli
authors.affiliation: Institute of Biomedical Sciences, Department of Parasitology, USP, São Paulo, Brazil.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Palmisano
authors.affiliation: Department of Chemistry, University of Parma, 43124 Parma, Italy.
authors.forename: Maria
authors.initials: M
authors.lastname: Careri
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230 Odense M, Denmark. Electronic address: mrl@bmb.sdu.dk.
authors.forename: Martin R
authors.initials: MR
authors.lastname: Larsen
mesh_terms: D000199:Actins / Q000737:chemistry; D000244:Adenosine Diphosphate / Q000737:chemistry; D001792:Blood Platelets / Q000737:chemistry / Q000166:cytology*; D002450:Cell Communication; D055252:Cell-Derived Microparticles / Q000737:chemistry*; D016000:Cluster Analysis; D003094:Collagen / Q000737:chemistry; D003599:Cytoskeleton / Q000378:metabolism; D030562:Databases, Protein; D006801:Humans; D010710:Phosphates / Q000737:chemistry; D015539:Platelet Activation; D011506:Proteins / Q000737:chemistry*; D020543:Proteome / Q000737:chemistry*; D040901:Proteomics; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry; D013917:Thrombin / Q000737:chemistry
chemical_list: D000199:Actins; D010710:Phosphates; D011506:Proteins; D020543:Proteome; D000244:Adenosine Diphosphate; D003094:Collagen; D013917:Thrombin
keywords: Agonist strength; Mass spectrometry; Platelet activation; Platelet-derived microparticles; Proteomics