Project description:Equine herpesvirus type 8 (EHV-8), a member of the alpha herpesvirus subfamily, is a significant pathogen in donkeys, causing abortion and respiratory infections, which result in considerable economic losses within the equine industry. Despite its importance, limited research has been conducted on the molecular response to EHV-8 in donkeys. The present study investigated the host cell response to EHV-8 infection in Rabbit kidney (RK-13) cells through transcriptomic and proteomic approaches. Our findings identified several candidate genes and proteins, along with their associated signaling pathways, involved in the cellular response to EHV-8 infection in this in vitro model. However, because RK-13 cells may not accurately replicate viral-host interactions in equine species, additional in vivo studies in horses and donkeys are necessary to achieve a more thorough understanding of viral pathogenesis in these animals.
2025-06-02 | PXD062648 | Pride
Project description:Association between SNPs within candidate genes and fertility in pigs
Project description:The goal of this study was to identify whole blood DNA methylation marks associated with biomarkers characterizing the Thrombin Generation Potential. Dataset includes 238 samples from MARTHA study (MARseille THrombosis Association Study) epityped for the Illumina HumanMethylation 450K and phenotyped for LagTime, Peak height and Endogeneous Thrombin Potential. Age and sex information are also provided.
Project description:Objective: Thrombin is the key serine protease of the coagulation cascade and mediates cellular responses by activation of protease-activated receptors (PARs). The predominant thrombin receptor is PAR1 and in endothelial cells (ECs) thrombin dynamically regulates a plethora of phosphorylation events. However, it has remained unclear if thrombin signaling is exclusively mediated through PAR1. Furthermore, mechanistic insight into activation and inhibition of PAR1-mediated EC signaling is lacking. In addition, signaling networks of biased PAR1 activation after differential cleavage of the PAR1 N-terminus have remained an unresolved issue.Approach and Results: Here, we used a quantitative phosphoproteomics approach to show that ‘classical’ and ‘peptide’ activation of PAR1 induce highly similar signaling, that low thrombin concentrations initiate only limited phosphoregulation, and that the PAR1 inhibitors vorapaxar and parmodulin-2 demonstrate distinct antagonistic properties. Subsequent analysis of the thrombin-regulated phosphosites in presence of PAR1 inhibitors revealed that biased activation of PAR1 is not solely linked to a specific G-protein downstream of PAR1. In addition, we showed that only the canonical thrombin PAR1 tethered ligand induces extensive early phosphoregulation in ECs.Conclusions: Our study provides detailed insight in the signaling mechanisms downstream of PAR1. Our data demonstrates that thrombin-induced EC phosphoregulation is mediated exclusively through PAR1, that thrombin and thrombin-TL peptide induce similar phosphoregulation and that only canonical PAR1 cleavage by thrombin generates a tethered ligand that potently induces early signaling. Furthermore, platelet PAR1 inhibitors directly affect EC signaling, indicating it will be a challenge to design a PAR1 antagonist that will target only those pathways responsible for tissue pathology.
Project description:Phosphoproteomic analysis of platelets activated by pro-thrombotic oxidized phospholipids and thrombin Alejandro Zimman, Bjoern Titz, Evangelia Komisopoulou, Sudipta Biswas, Thomas G. Graeber, and Eugene A. Podrez ABSTRACT Specific oxidized phospholipids (oxPCCD36) promote platelet hyper-reactivity and thrombosis in hyperlipidemia via the scavenger receptor CD36, however the signaling pathway(s) induced in platelets by oxPCCD36 are not well defined. We have now employed mass spectrometry-based tyrosine, serine, and threonine global phosphoproteomics for the unbiased analysis of platelet signaling pathways induced by oxPCCD36 as well as by the strong physiological agonist thrombin. oxPCCD36 and thrombin induced differential phosphorylation of 115 proteins (162 phosphorylation sites) and 181 proteins (334 phosphorylation sites) respectively. Most of the phosphoproteome changes induced by either agonist have never been reported in platelets; thus they provide a new resource to study platelet signaling. Bioinformatic analyses of protein phosphorylation dependent responses were used to categorize preferential motifs for (de)phosphorylation, predict pathways and kinase activity, and construct a phosphoproteome network regulating integrin activation. A putative signaling pathway involving Src-family kinases, SYK, and PLCy2 was identified in platelets activated by oxPCCD36. Subsequent ex vivo studies in human platelets demonstrated that this pathway is downstream of the scavenger receptor CD36 and is critical for platelet activation by oxPCCD36. Our results provide multiple novel insights into the mechanism of platelet activation and specifically in platelet regulation by oxPCCD36. Methods Human platelets isolated by gel filtration (2.7 x 108 / mL) were incubated in Tyrode's buffer with 50 uM KODA-PC or PLPC (as control) for 30 min at 37 degrees C. Platelets were then centrifuged at 3,700 g (10 min, 35 degrees C) and lysed in 8 M urea, 50 mM Tris-HCl (pH 7.4), 1 mM Na3VO4, and 1 mM NaF with sonication. Phosphoproteome changes induced by the agonists were assessed based on trypsin digestion of the protein lysate, phosphopeptide enrichment, mass spectrometry analysis, chromatography alignment, and label-free quantitation as described in the Supplemental Materials and Methods of the publication. The same protocol was applied when studying platelet activation by thrombin, where gel-filtered platelets were incubated in Tyrode's buffer with 0.05 U/mL thrombin or in buffer alone (Resting) for 3 min at 37 degrees C.
