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Platelet activating factor

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https://www.readbyqxmd.com/read/28098805/chemical-constituents-from-the-roots-and-rhizomes-of-asarum-heterotropoides-var-mandshuricum-and-the-in-vitro-anti-inflammatory-activity
#1
Yu Jing, Yi-Fan Zhang, Ming-Ying Shang, Guang-Xue Liu, Yao-Li Li, Xuan Wang, Shao-Qing Cai
Anti-inflammatory compounds were investigated from the ethanol extract of the roots and rhizomes of Asarum heterotropoides var. mandshuricum, a traditional Chinese medicine called Xixin and used for pain and inflammatory. Nine new compounds were isolated, including six new lignans, neoasarinin A-C (1-3), neoasarininoside A and B (4 and 5), and asarinin B (7), and one new monoterpene, asarincin A (8), two new amides, asaramid II and III (10 and 11), and one new natural monoterpene, asaricin B (9), along with 37 known compounds (6, 12-47)...
January 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28097231/protein-disulfide-isomerase-inhibition-blocks-thrombin-generation-in-humans-by-interfering-with-platelet-factor-v-activation
#2
Jack D Stopa, Donna Neuberg, Maneka Puligandla, Bruce Furie, Robert Flaumenhaft, Jeffrey I Zwicker
BACKGROUND: Protein disulfide isomerase (PDI) is required for thrombus formation. We previously demonstrated that glycosylated quercetin flavonoids such as isoquercetin inhibit PDI activity and thrombus formation in animal models, but whether extracellular PDI represents a viable anticoagulant target in humans and how its inhibition affects blood coagulation remain unknown. METHODS: We evaluated effects of oral administration of isoquercetin on platelet-dependent thrombin generation in healthy subjects and patients with persistently elevated anti-phospholipid antibodies...
January 12, 2017: JCI Insight
https://www.readbyqxmd.com/read/28096486/phage-derived-protein-induces-increased-platelet-activation-and-is-associated-with-mortality-in-patients-with-invasive-pneumococcal-disease
#3
Rahajeng N Tunjungputri, Fredrick M Mobegi, Amelieke J Cremers, Christa E van der Gaast-de Jongh, Gerben Ferwerda, Jacques F Meis, Nel Roeleveld, Stephen D Bentley, Alexander S Pastura, Sacha A F T van Hijum, Andre J van der Ven, Quirijn de Mast, Aldert Zomer, Marien I de Jonge
: To improve our understanding about the severity of invasive pneumococcal disease (IPD), we investigated the association between the genotype of Streptococcus pneumoniae and disease outcomes for 349 bacteremic patients. A pneumococcal genome-wide association study (GWAS) demonstrated a strong correlation between 30-day mortality and the presence of the phage-derived gene pblB, encoding a platelet-binding protein whose effects on platelet activation were previously unknown. Platelets are increasingly recognized as key players of the innate immune system, and in sepsis, excessive platelet activation contributes to microvascular obstruction, tissue hypoperfusion, and finally multiorgan failure, leading to mortality...
January 17, 2017: MBio
https://www.readbyqxmd.com/read/28096231/roles-of-5-lipoxygenase-and-cyclooxygenase-2-in-the-biosynthesis-of-hemiketals-e2-and-d2-by-activated-human-leukocytes
#4
Juan A Giménez-Bastida, Takahiro Shibata, Koji Uchida, Claus Schneider
The 2 hemiketal (HK) eicosanoids HKD2 and HKE2 are the major products of the biosynthetic crossover of the 5-lipoxygenase (5-LOX) and cyclooxygenase-2 (COX-2) pathways. HKs result from the rearrangement of a di-endoperoxide intermediate formed in the COX-2-dependent oxygenation of 5S-hydroxyeicosatetraenoic acid (5S-HETE). We analyzed HK biosynthesis in human leukocytes stimulated ex vivo and defined the biosynthetic roles of 5-LOX and COX-2, using inhibitors and incubations with exogenous substrates. Activation of leukocytes with LPS followed by treatment with the calcium ionophore A23187 resulted in the formation of PGE2, 5-HETE, and LTB4 as the principal metabolites of COX-2 and 5-LOX, respectively...
January 17, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28095402/a-general-shear-dependent-model-for-thrombus-formation
#5
Alireza Yazdani, He Li, Jay D Humphrey, George Em Karniadakis
Modeling the transport, activation, and adhesion of platelets is crucial in predicting thrombus formation and growth following a thrombotic event in normal or pathological conditions. We propose a shear-dependent platelet adhesive model based on the Morse potential that is calibrated by existing in vivo and in vitro experimental data and can be used over a wide range of flow shear rates ([Formula: see text]). We introduce an Eulerian-Lagrangian model where hemodynamics is solved on a fixed Eulerian grid, while platelets are tracked using a Lagrangian framework...
January 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28094295/loss-of-pafr-prevents-neuroinflammation-and-brain-dysfunction-after-traumatic-brain-injury
#6
Xiang-Jie Yin, Zhen-Yan Chen, Xiao-Na Zhu, Jin-Jia Hu
Traumatic brain injury (TBI) is a principal cause of death and disability worldwide, which is a major public health problem. Death caused by TBI accounts for a third of all damage related illnesses, which 75% TBI occurred in low and middle income countries. With the increasing use of motor vehicles, the incidence of TBI has been at a high level. The abnormal brain functions of TBI patients often show the acute and long-term neurological dysfunction, which mainly associated with the pathological process of malignant brain edema and neuroinflammation in the brain...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28093367/effect-of-construction-of-tio2-nanotubes-on-platelet-behaviors-structure-property-relationships
#7
Qiaoling Huang, Yun Yang, Dajiang Zheng, Ran Song, Yanmei Zhang, Pinliang Jiang, Erwin A Vogler, Changjian Lin
: Blood compatibility of TiO2 nanotubes (TNTs) has been assessed in rabbit platelet-rich plasma (PRP), which combines activation of both blood plasma coagulation and platelets. We find that (i) amorphous TiO2 nanotubes (TNTs) with relatively larger outer diameters led to reduced platelet adhesion/activation, (ii) TNTs with relatively smaller outer diameters in a predominately rutile phase also inhibited platelet adhesion and activation, and (iii) a pervasive fibrin network formed on larger outer diameter TNTs in a predominately anatase phase...
January 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28092924/evaluation-of-the-use-of-rotational-thromboelastometry-in-the-assessment-of-fxi-deficency
#8
G N Pike, A M Cumming, J Thachil, C R M Hay, P H B Bolton-Maggs, J Burthem
INTRODUCTION: The absence of a reliable clinical test to predict bleeding tendency leaves factor XI (FXI)-deficient individuals at risk of overtreatment or under treatment. AIM: To assess whether rotational thromboelastometry has value in detection of FXI deficiency and identification of bleeding tendency. METHODS: Thromboelastometry was measured in whole blood and platelet-rich plasma (PRP) samples containing corn trypsin inhibitor (CTI) from controls (n = 50) and FXI-deficient individuals (n = 93) at tissue factor (TF) 0...
January 16, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28089463/anti-inflammatory-effects-of-the-selective-phosphodiesterase-3-inhibitor-cilostazol-and-antioxidants-enzymatically-modified-isoquercitrin-and-%C3%AE-lipoic-acid-reduce-dextran-sulphate-sodium-induced-colorectal-mucosal-injury-in-mice
#9
Yumi Kangawa, Toshinori Yoshida, Hajime Abe, Yoshiki Seto, Taishi Miyashita, Michi Nakamura, Tohru Kihara, Shim-Mo Hayashi, Makoto Shibutani
Developing effective treatments and preventing inflammatory bowel disease (IBD) are urgent challenges in improving patients' health. It has been suggested that platelet activation and reactive oxidative species generation are involved in the pathogenesis of IBD. We examined the inhibitory effects of a selective phosphodiesterase-3 inhibitor, cilostazol (CZ), and two antioxidants, enzymatically modified isoquercitrin (EMIQ) and α-lipoic acid (ALA), against dextran sulphate sodium (DSS)-induced colitis. BALB/c mice were treated with 0...
January 12, 2017: Experimental and Toxicologic Pathology: Official Journal of the Gesellschaft Für Toxikologische Pathologie
https://www.readbyqxmd.com/read/28087247/activity-of-von-willebrand-factor-and-levels-of-vwf-cleaving-protease-adamts13-in-preterm-and-full-term-neonates
#10
T Strauss, N Elisha, B Ravid, N Rosenberg, A Lubetsky, S Levy-Mendelovich, I Morag, U Nowak Göttl, G Kenet
Von Willebrand Factor (VWF) has a central role in primary hemostasis. Its biological activity is related to the size of VWF multimers, spontaneously binding to platelets and inducing circulating microthrombi formation. This process is down-regulated by the VWF cleaving protease ADAMTS13 (A Disintegrin and Metalloprotease with ThromboSpondin motif). To date, information regarding the levels of ADAMTS13 in neonates and preterm infants is scarce. Our aim was to study ADAMTS13, VWF antigen (Ag) and Ristocetin cofactor (RiCof) activity in neonates and evaluate potential correlations with perinatal complications...
December 29, 2016: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/28086790/rna-sequencing-for-global-gene-expression-associated-with-muscle-growth-in-a-single-male-modern-broiler-line-compared-to-a-foundational-barred-plymouth-rock-chicken-line
#11
Byung-Whi Kong, Nicholas Hudson, Dongwon Seo, Seok Lee, Bhuwan Khatri, Kentu Lassiter, Devin Cook, Alissa Piekarski, Sami Dridi, Nicholas Anthony, Walter Bottje
BACKGROUND: Modern broiler chickens exhibit very rapid growth and high feed efficiency compared to unselected chicken breeds. The improved production efficiency in modern broiler chickens was achieved by the intensive genetic selection for meat production. This study was designed to investigate the genetic alterations accumulated in modern broiler breeder lines during selective breeding conducted over several decades. METHODS: To identify genes important in determining muscle growth and feed efficiency in broilers, RNA sequencing (RNAseq) was conducted with breast muscle in modern pedigree male (PeM) broilers (n = 6 per group), and with an unselected foundation broiler line (Barred Plymouth Rock; BPR)...
January 13, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28081293/role-of-pyridoxal-5-phosphate-at-the-titanium-implant-interface-in-vivo-increased-hemophilicity-inactive-platelet-adhesion-and-osteointegration
#12
Jung Seung Lee, Kyuri Kim, Joseph P Park, Seung-Woo Cho, Haeshin Lee
Titanium is the most biocompatible inorganic biomaterial with a long history of use in orthopedic and dental implants. However, promoting rapid and effective bone formation and integration onto etched, rough TiO2 surfaces has been a challenging topic. Here, 21 commercially available molecules are examined that met the following criteria: (1) contain phosphonic acid for stable immobilization onto TiO2 surfaces and (2) have a molecular weight less than 500 Da for negligible coating thickness. Of these molecules, the surface immobilization of pyridoxal 5'-phosphate (PLP), an active form of vitamin B6 , dramatically increases the hemophilic property of the surface and accelerated osteointegration in vivo...
January 12, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28079789/the-impact-of-irrigating-fluid-absorption-on-blood-coagulation-in-patients-undergoing-transurethral-resection-of-the-prostate-a-prospective-observational-study-using-rotational-thromboelastometry
#13
Hyun-Jung Shin, Hyo-Seok Na, Young-Tae Jeon, Hee-Pyoung Park, Sun-Woo Nam, Jung-Won Hwang
Although endoscopic transurethral resection of the prostate (TURP) is a well-established procedure as a treatment for benign prostatic hyperplasia, its complications remain a concern. Among these, coagulopathy may be caused by the absorption of irrigating fluid. This study aimed to evaluate such phenomenon using a rotational thromboelastometry (ROTEM).A total of 20 patients undergoing TURP participated in this study. A mixture of 2.7% sorbitol-0.54% mannitol solution and 1% ethanol was used as an irrigating fluid, and fluid absorption was measured via the ethanol concentration in expired breath...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28078954/nanovesicle-delivery-to-the-liver-via-retinol-binding-protein-and-platelet-derived-growth-factor-receptors-how-targeting-ligands-affect-biodistribution
#14
Ching-Yun Hsu, Chun-Han Chen, Ibrahim A Aljuffali, You-Shan Dai, Jia-You Fang
AIM: Nanovesicles (NVs) conjugating ligands can deliver to the specific nidus. We designed a nanosystem targeting the injectable niosomes to liver for examining biodistribution. METHODOLOGY: Vitamin A and antiplatelet-derived growth factor receptor antibody were employed as the ligands to be taken by hepatic stellate cells. The biodistribution in rats was visualized by bioimaging. RESULTS: A significant liver accumulation was detected for antibody-embedded NVs at 2 h after dosing...
January 12, 2017: Nanomedicine
https://www.readbyqxmd.com/read/28078347/alterations-of-the-platelet-proteome-in-type-i-glanzmann-thrombasthenia-caused-by-different-homozygous-delg-frameshift-mutations-in-itga2b
#15
Stefan Loroch, Katharina Trabold, Stepan Gambaryan, Cora Reiß, Kathrin Schwierczek, Ingrid Fleming, Albert Sickmann, Wolfgang Behnisch, Barbara Zieger, René P Zahedi, Ulrich Walter, Kerstin Jurk
Glanzmann thrombasthenia (GT) is one of the best characterized inherited platelet function disorders but global platelet proteome has not been determined in these patients. We investigated the proteome and function of platelets from two patients with type I GT, caused by different homozygous ITGA2b mutations, from family members and unrelated controls. The global proteome of highly purified washed platelets was quantified by liquid chromatography-mass spectrometry (LC-MS) and targeted MS-methods. Platelet function was analysed by flow cytometry, light transmission aggregometry and flow-based assays...
January 12, 2017: Thrombosis and Haemostasis
https://www.readbyqxmd.com/read/28077574/platelet-activating-factor-mediates-endotoxin-tolerance-by-regulating-indoleamine-2-3-dioxygenase-dependent-expression-of-the-suppressor-of-cytokine-signaling-3
#16
Kyung Tae Noh, In Duk Jung, Gil Sun Cha, Myung-Kwan Han, Yeong-Min Park
Indoleamine 2, 3-dioxygenase (IDO) mediates immune tolerance, and suppressor of cytokine signaling 3 (SOCS3) negatively regulates the JAK/STAT signal transduction pathway. We previously determined plateletactivating factor (PAF) protects mice against lipopolysaccharide (LPS)-induced endotoxic shock, but its detailed mechanism of action was unknown. We performed survival experiments in IDO+/+ and IDO-/- mice using an LPSinduced endotoxemia model and rated organ injury (neutrophil infiltration, and liver function)...
January 11, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28077534/reduced-mortality-by-meeting-guideline-criteria-before-using-recombinant-activated-factor-vii-in-severe-trauma-patients-with-massive-bleeding
#17
J-F Payen, M Berthet, C Genty, P Declety, D Garrigue-Huet, N Morel, P Bouzat, B Riou, J-L Bosson
BACKGROUND: Management of trauma patients with severe bleeding has led to criteria before considering use of recombinant activated factor VII (rFVIIa), including haemoglobin >8 g dl(-1), serum fibrinogen ≥1.0 g l(-1), platelets >50,000 x 10(9) l(-1), arterial pH ≥ 7.20, and body temperature ≥34 °C. We hypothesized that meeting these criteria is associated with improved outcomes. METHODS: In this prospective cohort study of 26 French trauma centres, subjects were included if they received rFVIIa for persistent massive bleeding despite appropriate care after severe blunt and/or penetrating trauma...
October 2016: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28076816/mutation-g1629e-increases-von-willebrand-factor-cleavage-via-a-cooperative-destabilization-mechanism
#18
Camilo Aponte-Santamaría, Svenja Lippok, Judith J Mittag, Tobias Obser, Reinhard Schneppenheim, Carsten Baldauf, Frauke Gräter, Ulrich Budde, Joachim O Rädler
The large multimeric glycoprotein von Willebrand Factor (VWF) plays a pivotal adhesive role during primary hemostasis. VWF is cleaved by the protease ADAMTS13 as a down-regulatory mechanism to prevent excessive VWF-mediated platelet aggregation. For each VWF monomer, the ADAMTS13 cleavage site is located deeply buried inside the VWF A2 domain. External forces in vivo or denaturants in vitro trigger the unfolding of this domain, thereby leaving the cleavage site solvent-exposed and ready for cleavage. Mutations in the VWF A2 domain, facilitating the cleavage process, cause a distinct form of von Willebrand disease (VWD), VWD type 2A...
January 10, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28076805/regulation-of-active-icam-4-on-normal-and-sickle-cell-disease-rbcs-via-akaps-is-revealed-by-afm
#19
Jing Zhang, Krithika Abiraman, Sasia-Marie Jones, George Lykotrafitis, Biree Andemariam
Human healthy (wild-type (WT)) and homozygous sickle (SS) red blood cells (RBCs) express a large number of surface receptors that mediate cell adhesion between RBCs, and between RBCs and white blood cells, platelets, and the endothelium. In sickle cell disease (SCD), abnormal adhesion of RBCs to endothelial cells is mediated by the intercellular adhesion molecule-4 (ICAM-4), which appears on the RBC membrane and binds to the endothelial αvβ3 integrin. This is a key factor in the initiation of vaso-occlusive episodes, the hallmark of SCD...
January 10, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28076433/enhanced-rb-e2f-and-tsc-mtor-pathways-induce-synergistic-inhibition-in-pdgf-induced-proliferation-in-vascular-smooth-muscle-cells
#20
Yue Li, Xuan Li, Jie Liu, Wei Guo, Hongchao Zhang, Jianchang Wang
Platelet-derived growth factor (PDGF) plays an essential role in proliferation of vascular smooth muscle cells (VSMCs). The Rb/E2F and TSC/mTOR pathways contribute to the proliferation of VSMCs, but its exact roles in PDGF-induced proliferation are unclear. In this study, we demonstrated the roles of Rb/E2F and TSC/mTOR pathways in PDGF-induced proliferation in VSMCs. We found that PDGF stimulates the activity of E2F and mTOR pathways, and knockdown of either Rb or TSC2 increases PDGF-induced proliferation in VSMCs...
2017: PloS One
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