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https://www.readbyqxmd.com/read/28641286/effect-of-bexarotene-on-platelet-activation-and-apoptosis
#1
Hang Cao, Rosi Bissinger, Anja T Umbach, Meinrad Gawaz, Florian Lang
BACKGROUND/AIMS: The retinoid X receptor (RXRs) stimulator Bexarotene ((4-[1-(3,5,5,8,8-pentamethyl-5,6,7,8-tetrahydro-2-naphthyl)ethynyl] benzoic acid) is used for the treatment of several malignancies. Bexarotene is at least in part effective by stimulation of apoptosis of tumor cells. Moreover, Bexarotene triggers eryptosis, the suicidal death of erythrocytes. Similar to erythrocytes, blood platelets lack nuclei but are nevertheless able to enter an apoptosis-like phenotype, characterized by caspase activation, cell shrinkage and cell membrane scrambling with phospha-tidylserine translocation to the cell surface...
June 23, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28641140/effect-of-c1-inh-on-ischemia-reperfusion-injury-in-a-porcine-limb-ex-vivo-perfusion-model
#2
Mai M Abdelhafez, Jane Shaw, Damian Sutter, Jonas Schnider, Yara Banz, Hansjörg Jenni, Esther Voegelin, Mihai A Constantinescu, Robert Rieben
Revascularization of an amputated limb within 4-6h is essential to avoid extensive ischemia/reperfusion (I/R) injury leading to vascular leakage, edema and tissue necrosis. I/R injury is a pathological inflammatory condition that occurs during reperfusion of an organ or tissue after prolonged ischemia. It is characterized by a complex crosstalk between endothelial cell activation and the activation of plasma cascades. Vasculoprotective pharmacological intervention to prevent I/R injury might be an option to prolong the time window between limb amputation and successful replantation...
June 19, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28636010/engineering-multi-functional-bacterial-outer-membrane-vesicles-as-modular-nanodevices-for-biosensing-and-bioimaging
#3
Qi Chen, Sharon Rozovsky, Wilfred Chen
Outer membrane vesicles (OMVs) are proteoliposomes derived from the outer membrane and periplasmic space of many Gram-negative bacteria including E. coli as part of their natural growth cycle. Inspired by the natural ability of E. coli to sort proteins to both the exterior and interior of OMVs, we reported here a one-pot synthesis approach to engineer multi-functionalized OMV-based sensors for both antigen binding and signal generation. SlyB, a native lipoprotein, was used a fusion partner to package nanoluciferase (Nluc) within OMVs, while a previously developed INP-Scaf3 surface scaffold was fused to the Z-domain for antibody recruiting...
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28635328/dietary-implications-for-patients-receiving-long-term-oral-anticoagulation-therapy-for-treatment-and-prevention-of-thromboembolic-disease
#4
Emmanouela Kampouraki, Farhad Kamali
The effectiveness of oral anticoagulation therapy with warfarin (a vitamin K antagonist) in the treatment of thromboembolic disease, including stroke prophylaxis in patients with atrial fibrillation is well recognised. However, warfarin has a narrow therapeutic window and an unpredictable anticoagulation response, which make it difficult to achieve and maintain optimal anticoagulation. Various dietary factors, including sudden changes in eating patterns, can significantly alter anticoagulation control, thereby potentially exposing patients to the risk of bleeding or thromboembolic complications...
June 21, 2017: Expert Review of Clinical Pharmacology
https://www.readbyqxmd.com/read/28632925/a-kallikrein-targeting-rna-aptamer-inhibits-the-intrinsic-pathway-of-coagulation-and-reduces-bradykinin-release
#5
K-A Steen-Burrell, J Layzer, B A Sullenger
BACKGROUND: Plasma kallikrein is a serine protease that plays an integral role in many biological processes including coagulation, inflammation, and fibrinolysis. The main function of kallikrein in coagulation is the amplification of activated factor XIIa (FXIIa) generation which ultimately leads to thrombin generation and fibrin clot formation. Kallikrein is generated by FXIIa-mediated cleavage of the zymogen, prekallikrein which is usually complexed with the nonenzymatic cofactor, high-molecular-weight kininogen (HK)...
June 20, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/28632410/correlation-between-interleukin-6-and-thrombin-antithrombin-iii-complex-levels-in-retinal-diseases
#6
Rita Ehrlich, Alon Zahavi, Ruth Axer-Siegel, Ivan Budnik, Ayelet Dreznik, Mor Dahbash, Yael Nisgav, Elinor Megiddo, Gili Kenet, Dov Weinberger, Tami Livnat
PURPOSE: This study aims to evaluate and correlate the levels of interleukin-6 (IL-6) and thrombin-antithrombin III complex (TAT) in the vitreous of patients with different vitreoretinal pathologies. METHODS: Vitreous samples were collected from 78 patients scheduled for pars plana vitrectomy at a tertiary medical center. Patients were divided by the underlying vitreoretinal pathophysiology, as follows: macular hole (MH)/epiretinal membrane (ERM) (n = 26); rhegmatogenous retinal detachment (RRD) (n = 32); and proliferative diabetic retinopathy (PDR) (n = 20)...
June 20, 2017: Current Eye Research
https://www.readbyqxmd.com/read/28631887/thymic-stromal-lymphopoietin-is-expressed-in-human-corneal-stromal-cells-and-secreted-upon-protease-activated-receptor-1-activation
#7
Hongbo Yin, Yan Tian, Rongying Luo, Yingping Deng
Thymic stromal lymphopoietin (TSLP) is an interleukin-7 (IL-7) like cytokine that triggers inflammatory responses through activating dendritic cell. It is demonstrated to be involved in a number of disorders, including cancer, gastrointestinal diseases, and autoimmune diseases. In addition, TSLP is also found to be able to induce itch sensation by directly activating the itch sensory neurons. The expression of human TSLP is detected in various tissues such as heart, liver, testis, and prostate. In this study, we report that TSLP was expressed in the human corneal stromal cells, the highly specialized cells that are critical for the function of the cornea...
June 20, 2017: IUBMB Life
https://www.readbyqxmd.com/read/28629364/changes-in-concentrations-of-haemostatic-and-inflammatory-biomarkers-in-synovial-fluid-after-intra-articular-injection-of-lipopolysaccharide-in-horses
#8
Stine Mandrup Andreassen, Anne Mette Lindberg Vinther, Søren Saxmose Nielsen, Pia Haubro Andersen, Aziz Tnibar, Annemarie T Kristensen, Stine Jacobsen
BACKGROUND: Septic arthritis is a common and potentially devastating disease characterized by severe intra-articular (IA) inflammation and fibrin deposition. Research into equine joint pathologies has focused on inflammation, but recent research in humans suggests that both haemostatic and inflammatory pathways are activated in the joint compartment in arthritic conditions. The aim of this study was to characterize the IA haemostatic and inflammatory responses in horses with experimental lipopolysaccharide (LPS)-induced joint inflammation...
June 19, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28629055/a-novel-kind-of-polysulfone-material-with-excellent-biocompatibility-modified-by-the-sulfonated-hydroxypropyl-chitosan
#9
Tian-Ming Liu, Jing-Jie Xu, Yun-Ren Qiu
In order to ameliorate the biocompatibility of polysulfone (PSf), sulfonated hydroxypropyl chitosan (SHPCS) was grafted from PSf membrane material by Schiff-Base reaction. The original and modified membranes were characterized by attenuated total reflectance-Fourier transform infrared spectroscope (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), water contact angle (WCA) measurement, tensile strength test and antibacterial test in vitro, and the results indicated that the PSf modified by SHPCS (PSf-SHPCS) was synthesized successfully, the hydrophilicity of PSf-SHPCS membrane was improved to a great extent, all the membranes possessed good stability in physiological condition and the PSf-SHPCS membrane had good antibacterial property...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28625680/plant-made-potyvirus-like-particles-used-for-log-increasing-antibody-sensing-capacity
#10
Ivonne González-Gamboa, Pilar Manrique, Flora Sánchez, Fernando Ponz
Deployment of the elongated flexuous virions of Turnip mosaic virus (TuMV), a potyvirus, for peptide display on their external surface has been previously reported by us. Nonetheless, both in TuMV and other potyviruses some peptides hinder the ability of the virus to infect host plants. We found that a peptide derived from the human thrombin receptor (TR) inhibited TuMV infectivity. In an effort to get around this problem, TuMV virus-like particles (VLPs) were produced in plants by transient high-level expression of wild-type or recombinant coat protein (CP)...
June 15, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/28622642/highly-sensitive-electrochemical-thrombin-aptasensor-based-on-peptide-enhanced-electrocatalysis-of-hemin-g-quadruplex-and-nanocomposite-as-nanocarrier
#11
Yongmei Wu, Lina Zou, Sheng Lei, Qian Yu, Baoxian Ye
In this work, we first conjugated a short peptide to thrombin binding aptamer (TBA) and bond hemin to the hybrid, effectively rendering hemin/G4-peptide more active over the original hemin/G4, so that a highly sensitive electrochemical thrombin (TB) aptasensor was developed based on it and PtNTs@rGO nanocomposite. It was the first report on the application of hemin/G4-peptide in electrochemical aptasensor. PtNTs@rGO with large surface area served as excellent nanocarrier for high loading of hemin/G4-peptide hybrids, resulting in the formation of hemin/G4-peptide-PtNTs@rGO bioconjugate as the secondary aptamer and further signal enhancement...
June 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28615442/the-heterotrimeric-g-protein-g%C3%AE-1-interacts-with-the-catalytic-subunit-of-protein-phosphatase-1-and-modulates-g-protein-coupled-receptor-signaling-in-platelets
#12
Subhashree Pradhan, Tanvir Khatlani, Angus C Nairn, K Vinod Vijayan
Thrombosis is caused by the activation of platelets at the site of ruptured atherosclerotic plaques. This activation involves engagement of G protein coupled receptors (GPCR) on platelets that promotes their aggregation. Although it is known that protein kinases and phosphatases modulate GPCR signaling, how serine/threonine phosphatases integrate with G protein signaling pathways is less understood. Since the subcellular localization and substrate specificity of the catalytic subunit of protein phosphatase 1 (PP1c) is dictated by PP1c-interacting proteins, here we sought to identify new PP1c interactors...
June 14, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28614772/inhibition-of-blood-platelet-adhesion-by-phenolics-rich-fraction-of-hippophae-rhamnoides-l-fruits
#13
B Olas, B Kontek, M Szczesna, L Grabarczyk, A Stochmal, J Zuchowski
Beneficial influence of fruits on human health may be their ability to prevent the hyperactivation of blood platelets and cardiovascular disorders. Effects of the phenolic fraction from Hippophae rhamnoides fruit on different stages of blood platelet activation (platelet adhesion and aggregation) were studied in vitro. We also examined effects of the H. rhamnoides fraction on metabolism of thiol groups, which plays an important role in platelet functions. The effects of the H. rhamnoides fraction on adhesion of blood platelets to collagen and fibrinogen were determined with Tuszynski's and Murphy's method...
April 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28612952/a-nanoparticle-decorated-biomolecule-responsive-polymer-enables-robust-signaling-cascade-for-biosensing
#14
Zuan-Tao Lin, Jianhua Gu, Chien-Hung Li, T Randall Lee, Lixin Xie, Shuo Chen, Piao-Yang Cao, Shan Jiang, Yulin Yuan, Xia Hong, Hongting Wang, Dezhi Wang, Xifan Wang, Gang-Biao Jiang, Mikala Heon, Tianfu Wu
To meet the increasing demands for ultrasensitivity in monitoring trace amounts of low-abundance early biomarkers or environmental toxins, the development of a robust sensing system is urgently needed. Here, a novel signal cascade strategy is reported via an ultrasensitive polymeric sensing system (UPSS) composed of gold nanoparticle (gNP)-decorated polymer, which enables gNP aggregation in polymeric network and electrical conductance change upon specific aptamer-based biomolecular recognition. Ultralow concentrations of thrombin (10(-18) m) as well as a low molecular weight anatoxin (165 Da, 10(-14) m) are detected selectively and reproducibly...
June 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28611098/ticagrelor-and-eptifibatide-bolus-versus-ticagrelor-and-eptifibatide-bolus-with-2-hour-infusion-in-high-risk-acute-coronary-syndromes-patients-undergoing-early-percutaneous-coronary-intervention
#15
Moazez J Marian, Oluseun Alli, Firas Al Solaiman, Brigitta C Brott, Mark Sasse, Tara Leesar, Sumanth D Prabhu, Massoud A Leesar
BACKGROUND: In patients with non-ST-segment elevation acute coronary syndromes, inhibition of platelet aggregation (IPA) with a potent P2Y12 inhibitor, ticagrelor, was inferior to tirofiban infusion at 2 hours, indicating that glycoprotein IIb/IIIa inhibitors are still needed. Ticagrelor and eptifibatide bolus only may maximally inhibit platelet aggregation and decrease bleeding, but IPA with ticagrelor and eptifibatide bolus versus 2-hour infusion is unknown. METHODS AND RESULTS: A total of 70 P2Y12-naïve patients, with high-risk non-ST-segment elevation acute coronary syndromes, were randomized to ticagrelor and eptifibatide bolus (group 1) versus ticagrelor and eptifibatide bolus with 2-hour infusion (group 2)...
June 13, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/28609719/near-infrared-photoluminescence-biosensing-platform-with-gold-nanorods-over-gallium-arsenide-nanohorn-array
#16
Yiming Zhang, Tao Jiang, Longhua Tang
The near-infrared (NIR) optical detection of biomolecules with high sensitivity and reliability have been expected, however, it is still a challenge. In this work, we present a gold nanorods (AuNRs)-over-gallium arsenide nanohorn-like array (GaAs NHA) system that can be used for the ultrasensitive and specific NIR photoluminescence (PL) detection of DNA and proteins. The fabrication of GaAs NHA involved the technique of colloidal lithography and inductively coupled plasma dry etching, yielding large-area and well-defined nanostructural array, and exhibiting an improved PL emission compared to the planar GaAs substrate...
June 7, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28605659/trimester-specific-coagulation-and-anticoagulation-reference-intervals-for-healthy-pregnancy
#17
Chanjuan Cui, Shuo Yang, Jie Zhang, Guojing Wang, Shengkai Huang, Aiwei Li, Yuncong Zhang, Rui Qiao
BACKGROUND: Due to the normal physiological need of pregnancy and childbirth, the haemostatic system of pregnant women is different from that of healthy non-pregnant women. The aim of this study was to establish trimester-specific reference intervals of coagulation screening tests and thrombophilia markers in pregnancies without complications of females with Han ethnicity from North China. METHODS: In total 744 Han healthy pregnant women (first trimester 207 cases, second trimester 222 cases and third trimester 315 cases) and 121 healthy non-pregnant women were recruited in North China...
May 24, 2017: Thrombosis Research
https://www.readbyqxmd.com/read/28605123/in-vitro-effects-of-dalteparin-on-thrombin-generation-in-canine-plasma
#18
Carolyn Gara-Boivin, Jérôme R E Del Castillo, Marilyn E Dunn, Christian Bédard
BACKGROUND: The calibrated automated thrombogram (CAT) is a functional thrombin generation (TG) assay that may provide a new approach for monitoring anticoagulant therapy in dogs. The effects of dalteparin on TG variables in dogs are unknown. OBJECTIVES: Objectives were to establish normal TG variable ranges in dogs and measure the in vitro TG variables in canine pooled platelet-poor plasma (PPP) spiked with different dalteparin concentrations. METHODS: In the first experiment, plasma samples from 25 adult healthy Beagle dogs and 11 client-owned healthy dogs of multiple breeds was measured individually for obtaining normal TG values...
June 12, 2017: Veterinary Clinical Pathology
https://www.readbyqxmd.com/read/28604566/novel-oral-anticoagulants-in-the-peri-endoscopic-period
#19
Michael Genualdi, William H Frishman
Millions of patients in the United States are currently prescribed some form of anticoagulation therapy. Recently, novel oral anticoagulants (NOACs), including direct thrombin inhibitors and direct factor Xa inhibitors, have begun to replace warfarin as the drugs of choice for anticoagulation. As the use of these medications becomes more widespread, it is increasingly important for gastroenterologists to understand the risks associated with performing endoscopic procedures on patients who are taking NOACs. In this review, we provide an overview of the NOACs, as well as current guidelines from international societies regarding the management of patients scheduled to undergo endoscopic procedures who are prescribed these medications...
April 6, 2017: Cardiology in Review
https://www.readbyqxmd.com/read/28603040/a-real-time-control-system-of-gene-expression-using-ligand-bound-nucleic-acid-aptamer-for-metabolic-engineering
#20
Jing Wang, Xun Cui, Le Yang, Zhe Zhang, Liping Lv, Haoyuan Wang, Zhenmin Zhao, Ningzi Guan, Lichun Dong, Rachel Chen
Artificial control of bio-functions through regulating gene expression is one of the most important and attractive technologies to build novel living systems that are useful in the areas of chemical synthesis, nanotechnology, pharmacology, cell biology. Here, we present a novel real-time control system of gene regulation that includes an enhancement element by introducing duplex DNA aptamers upstream promoter and a repression element by introducing a RNA aptamer upstream ribosome binding site. With the presence of ligands corresponding to the DNA aptamers, the expression of the target gene can be potentially enhanced at the transcriptional level by strengthening the recognition capability of RNAP to the recognition region and speeding up the separation efficiency of the unwinding region due to the induced DNA bubble around the thrombin-bound aptamers; while with the presence of RNA aptamer ligand, the gene expression can be repressed at the translational level by weakening the recognition capability of ribosome to RBS due to the shielding of RBS by the formed aptamer-ligand complex upstream RBS...
June 8, 2017: Metabolic Engineering
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