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https://www.readbyqxmd.com/read/28220122/nf-%C3%AE%C2%BAb-links-tlr2-and-par1-to-soluble-immunomodulator-factor-secretion-in-human-platelets
#1
Pauline Damien, Fabrice Cognasse, Bernard Payrastre, Sherry L Spinelli, Neil Blumberg, Charles-Antoine Arthaud, Marie-Ange Eyraud, Richard P Phipps, Archibald McNicol, Bruno Pozzetto, Olivier Garraud, Hind Hamzeh-Cognasse
The primary toll-like receptor (TLR)-mediated immune cell response pathway common for all TLRs is MyD88-dependent activation of NF-κB, a seminal transcription factor for many chemokines and cytokines. Remarkably, anucleate platelets express the NF-κB machinery, whose role in platelets remains poorly understood. Here, we investigated the contribution of NF-κB in the release of cytokines and serotonin by human platelets, following selective stimulation of TLR2 and protease activated receptor 1 (PAR1), a classical and non-classical pattern-recognition receptor, respectively, able to participate to the innate immune system...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28218620/endothelial-antigen-assembly-leads-to-thrombotic-complications-in-heparin-induced-thrombocytopenia
#2
Vincent Hayes, Ian Johnston, Gowthami M Arepally, Steven E McKenzie, Douglas B Cines, Lubica Rauova, Mortimer Poncz
Heparin-induced thrombocytopenia (HIT) is a prothrombotic disorder initiated by antibodies against complexes between human platelet factor 4 (hPF4) and heparin. A better understanding of the events that initiate the prothrombotic state may improve approaches to antithrombotic management. Here, we visualized thrombus formation in an in vivo murine model and an endothelialized microfluidic system that simulate the pathogenesis of HIT. hPF4 released from platelets predominantly bound to peri-injury endothelium and formed HIT antigenic complexes that were dissociated by heparin...
February 20, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28218242/protein-disulfide-isomerase-secretion-following-vascular-injury-initiates-a-regulatory-pathway-for-thrombus-formation
#3
Sheryl R Bowley, Chao Fang, Glenn Merrill-Skoloff, Barbara C Furie, Bruce Furie
Protein disulfide isomerase (PDI), secreted by platelets and endothelial cells on vascular injury, is required for thrombus formation. Using PDI variants that form mixed disulfide complexes with their substrates, we identify by kinetic trapping multiple substrate proteins, including vitronectin. Plasma vitronectin does not bind to αvβ3 or αIIbβ3 integrins on endothelial cells and platelets. The released PDI reduces disulfide bonds on plasma vitronectin, enabling vitronectin to bind to αVβ3 and αIIbβ3...
February 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28215042/platelet-mediated-modulation-of-fibrinolysis
#4
Claire S Whyte, Joanne L Mitchell, Nicola J Mutch
Platelets are crucial to the hemostatic response. Their role in coagulation is well documented and they have been considered for some time to promote resistance of thrombi to fibrinolysis. Platelets confer resistance to lysis by promoting clot retraction of the immediate fibrin network and through release of plasminogen activator inhibitor-1 from their α-granules. However, recent developments in the field indicate that the role of platelets in fibrinolysis is much more diverse. Indeed, novel studies suggest that platelets form different subpopulations upon activation that play varied roles in regulating hemostasis...
February 19, 2017: Seminars in Thrombosis and Hemostasis
https://www.readbyqxmd.com/read/28207887/platelet-monocyte-derived-and-tissue-factor-carrying-circulating-microparticles-are-related-to-acute-myocardial-infarction-severity
#5
Gemma Chiva-Blanch, Kristian Laake, Peder Myhre, Vibeke Bratseth, Harald Arnesen, Svein Solheim, Lina Badimon, Ingebjørg Seljeflot
OBJECTIVE: Circulating microparticles (cMPs) are phospholipid-rich vesicles released from cells when activated or injured, and contribute to the formation of intracoronary thrombi. Tissue factor (TF, CD142) is the main trigger of fibrin formation and TF-carrying cMPs are considered one of the most procoagulant cMPs. Similar types of atherosclerotic lesions may lead to different types of AMI, although the mechanisms behind are unresolved. Therefore, we aimed to investigate the phenotype of cMPs found in plasma of ACS patients and its relation to AMI severity and thrombotic burden...
2017: PloS One
https://www.readbyqxmd.com/read/28202370/to-evaluate-the-role-of-platelet-rich-plasma-in-healing-of-acute-diaphyseal-fractures-of-the-femur
#6
Roop Singh, Rajesh Rohilla, Jeetesh Gawande, Paramjit Kumar Sehgal
PURPOSE: New research is focusing on the use of autologous growth factors to increase the effect of bone fracture healing while decreasing the amount of healing time for the patient. Platelets have been demonstrated to be the natural storage vessel for several growth factors and cytokines that promote blood coagulation, tissue repair, and the process of bone mineralization. The present study aims to evaluate the role of platelet-rich plasma (PRP) in healing of acute femoral shaft fractures radiologically...
January 20, 2017: Chinese Journal of Traumatology, Zhonghua Chuang Shang za Zhi
https://www.readbyqxmd.com/read/28198453/doxorubicin-loaded-platelets-as-a-smart-drug-delivery-system-an-improved-therapy-for-lymphoma
#7
Peipei Xu, Huaqin Zuo, Bing Chen, Ruju Wang, Arsalan Ahmed, Yong Hu, Jian Ouyang
Chemotherapy is majorly used for the treatment of many cancers, including lymphoma. However, cytotoxic drugs, utilized in chemotherapy, can induce various side effects on normal tissues because of their non-specific distribution in the body. Natural platelets are used as drug carriers because of their biocompatibility and specific targeting to vascular disorders, such as cancer, inflammation, and thrombosis. In this work, doxorubicin (DOX) was loaded in natural platelets for treatment of lymphoma. Results showed that DOX was loaded into platelets with high drug loading and encapsulation efficiency...
February 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28194217/schisandra-chinensis-and-morus-alba-synergistically-inhibit-in-vivo-thrombus-formation-and-platelet-aggregation-by-impairing-the-glycoprotein-vi-pathway
#8
Dong-Seon Kim, Muhammad Irfan, Yoon-Young Sung, Seung Hyung Kim, Sun Haeng Park, Young Hyun Choi, Man Hee Rhee, Ho Kyoung Kim
Morus alba L. (MAL) extract has been used in traditional medicine for its cardioprotective and antiplatelet effects, while another herbal remedy, Schisandra chinensis (SCC), has been reported to have anti-inflammatory and antioxidant properties. We evaluated underlying cellular changes exerted by extracts of these plants on platelet function and effects of SCC + MAL on in vivo thrombus formation using AV shunt and tail thrombosis-length models in rats. In vitro platelet aggregation, granule secretion, and [Ca(2+)] i release assays were carried out...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28188927/xanthohumol-isolated-from-humulus-lupulus-prevents-thrombosis-without-increased-bleeding-risk-by-inhibiting-platelet-activation-and-mtdna-release
#9
Guang Xin, Zeliang Wei, Chengjie Ji, Huajie Zheng, Jun Gu, Limei Ma, Wenfang Huang, Susan L Morris-Natschke, Jwu-Lai Yeh, Rui Zhang, Chaoyi Qin, Li Wen, Zhihua Xing, Yu Cao, Qing Xia, Ke Li, Hai Niu, Kuo-Hsiung Lee, Wen Huang
AIM: As the global population has reached 7 billion and the baby boom generation reaches old age, thrombosis has become the major contributor to the global disease burden. It has been reported that, in moderate doses, beer may protect against thrombosis. Xanthohumol (XN), an antioxidant, is found at high concentrations in hop cones (Humulus lupulus L.) and is a common ingredient of beer. Here, the aim of the present work was to investigate the effects of XN on antithrombotic and antiplatelet activities, and study its mechanism...
February 7, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28188071/a-good-manufacturing-practice-grade-standard-protocol-for-exclusively-human-mesenchymal-stromal-cell-derived-extracellular-vesicles
#10
Karin Pachler, Thomas Lener, Doris Streif, Zsuzsanna A Dunai, Alexandre Desgeorges, Martina Feichtner, Michaela Öller, Katharina Schallmoser, Eva Rohde, Mario Gimona
BACKGROUND AIMS: Extracellular vesicles (EVs) released by mesenchymal stromal cells (MSCs) may contribute to biological processes such as tissue regeneration, immunomodulation and neuroprotection. Evaluation of their therapeutic potential and application in future clinical trials demands thorough characterization of EV content and production under defined medium conditions, devoid of xenogenic substances and serum-derived vesicles. Addressing the apparent need for such a growth medium, we have developed a medium formulation based on pooled human platelet lysate (pHPL), free from animal-derived xenogenic additives and depleted of EVs...
February 7, 2017: Cytotherapy
https://www.readbyqxmd.com/read/28186112/localization-of-short-chain-polyphosphate-enhances-its-ability-to-clot-flowing-blood-plasma
#11
Ju Hun Yeon, Nima Mazinani, Travis S Schlappi, Karen Y T Chan, James R Baylis, Stephanie A Smith, Alexander J Donovan, Damien Kudela, Galen D Stucky, Ying Liu, James H Morrissey, Christian J Kastrup
Short-chain polyphosphate (polyP) is released from platelets upon platelet activation, but it is not clear if it contributes to thrombosis. PolyP has increased propensity to clot blood with increased polymer length and when localized onto particles, but it is unknown whether spatial localization of short-chain polyP can accelerate clotting of flowing blood. Here, numerical simulations predicted the effect of localization of polyP on clotting under flow, and this was tested in vitro using microfluidics. Synthetic polyP was more effective at triggering clotting of flowing blood plasma when localized on a surface than when solubilized in solution or when localized as nanoparticles, accelerating clotting at 10-200 fold lower concentrations, particularly at low to sub-physiological shear rates typical of where thrombosis occurs in large veins or valves...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28183633/a-cytotoxicity-study-of-silicon-oxycarbide-nanowires-as-cell-scaffold-for-biomedical-applications
#12
P Lagonegro, F Rossi, C Galli, A Smerieri, R Alinovi, S Pinelli, T Rimoldi, G Attolini, G Macaluso, C Macaluso, S E Saddow, G Salviati
GOAL: Nanowires are promising biomaterials in multiple clinical applications. The goal of this study was to investigate the cytotoxicity of carbon-doped silica nanowires (SiOxCy NWs) on a fibroblastic cell line in vitro. MATERIALS AND METHODS: SiOxCy NWs were grown on Si substrates by CVD process. Murine L929 fibroblasts were cultured in complete DMEM and indirect and direct cytotoxicity tests were performed in agreement with ISO 19003-5, by quantitating cell viability at MTT and chemiluminescent assay...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28181366/molecular-phenotype-and-bleeding-risks-of-an-inherited-platelet-disorder-in-a-family-with-a-runx1-frameshift-mutation
#13
M S Badin, J K Iyer, M Chong, L Graf, G E Rivard, J S Waye, A D Paterson, G Pare, C P M Hayward
INTRODUCTION: Inherited defects in RUNX1 are important causes of platelet function disorders. AIM: Our goals were to evaluate RUNX1-related platelet disorders among individuals evaluated for uncharacterized, inherited platelet function disorders and test a proof of concept that bleeding risks could be quantitatively estimated for typical families with an inherited platelet function disorder. METHODS: Index cases with an uncharacterized inherited platelet function disorder were subjected to exome sequencing with confirmation of RUNX1 mutations by Sanger sequencing...
February 8, 2017: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/28181224/opening-new-horizons-in-regenerative-dermatology-using-platelet-based-autologous-therapies
#14
Eduardo Anitua, Ander Pino, Gorka Orive
Biological therapeutic therapies are gaining the attention of scientists and medical doctors. Accumulating evidence suggests that blood-derived autologous therapies are safe and effective treatments for skin repair and wound healing. The fibrin network formed after plasmatic activation and the autologous growth factors released when platelets degranulate constitute a real biological medicine that has been shown to promote cell recruitment, stimulate new blood vessel formation, reduce inflammation as well as protect from local infections...
March 2017: International Journal of Dermatology
https://www.readbyqxmd.com/read/28178976/advanced-glycation-end-products-induce-brain-derived-neurotrophic-factor-release-from-human-platelets-through-the-src-family-kinase-activation
#15
Kazuo Furukawa, Ichiro Fuse, Yuriko Iwakura, Hidekazu Sotoyama, Osamu Hanyu, Hiroyuki Nawa, Hirohito Sone, Nobuyuki Takei
BACKGROUND: Brain-derived neurotrophic factor (BDNF) exerts beneficial effects not only on diabetic neuropathies but also on cardiovascular injury. There is argument regarding the levels of serum BDNF in patients with diabetes mellitus (DM). Because BDNF in peripheral blood is rich in platelets, this may represent dysregulation of BDNF release from platelets. Here we focused on advanced glycation end products (AGEs), which are elevated in patients with DM and have adverse effects on cardiovascular functions...
February 8, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28178611/coaxial-electrospinning-multicomponent-functional-controlled-release-vascular-graft-optimization-of-graft-properties
#16
Anlin Yin, Rifang Luo, Jiukai Li, Xiumei Mo, Yunbing Wang, Xingdong Zhang
Small diameter vascular grafts possessing desirable biocompatibility and suitable mechanical properties have become an urgent clinic demand. Herein, heparin loaded fibrous grafts of collagen/chitosan/poly(l-lactic acid-co-ε-caprolactone) (PLCL) were successfully fabricated via coaxial electrospinning. By controlling the concentration of heparin and the ratio of collagen/chitosan/PLCL, most grafts had the heparin encapsulation efficiency higher than 70%, and the heparin presented sustained release for more than 45 days...
January 27, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28178387/transient-von-willebrand-factor-mediated-platelet-influx-stimulates-liver-regeneration-after-partial-hepatectomy-in-mice
#17
Marc Kirschbaum, Craig N Jenne, Zwanida J Veldhuis, Klaas A Sjollema, Peter J Lenting, Ben N G Giepmans, Robert J Porte, Paul Kubes, Cécile V Denis, Ton Lisman
BACKGROUND & AIMS: In addition to their function in thrombosis and hemostasis, platelets play an important role in the stimulation of liver regeneration. It has been suggested that platelets deliver mitogenic cargo to the regenerating liver, and accumulation of platelets in the regenerating liver has been demonstrated. We studied kinetics of platelet influx in the regenerating liver and investigated the signal that initiates platelet influx. METHODS: We visualized platelets in the liver remnant after partial hepatectomy in mice using intravital microscopy and assessed liver regeneration by examination of liver/body weight ratio and the number of proliferating hepatocytes examined by immunohistochemistry...
February 8, 2017: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/28176852/a-critical-role-of-platelet-tgf-%C3%AE-release-in-podoplanin-mediated-tumour-invasion-and-metastasis
#18
Ai Takemoto, Mina Okitaka, Satoshi Takagi, Miho Takami, Shigeo Sato, Makoto Nishio, Sakae Okumura, Naoya Fujita
The tumour microenvironment is critical for various characteristics of tumour malignancies. Platelets, as part of the tumour microenvironment, are associated with metastasis formation via increasing the rate of tumour embolus formation in microvasculature. However, the mechanisms underlying the ability of tumour cells to acquire invasiveness and extravasate into target organs at the site of embolization remain unclear. In this study, we reported that platelet aggregation-inducing factor podoplanin expressed on tumour cell surfaces were found to not only promote the formation of tumour-platelet aggregates via interaction with platelets, but also induced the epithelial-mesenchymal transition (EMT) of tumour cells by enhancing transforming growth factor-β (TGF-β) release from platelets...
February 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28170176/exosomes-derived-from-akt-modified-human-umbilical-cord-mesenchymal-stem-cells-improve-cardiac-regeneration-and-promote-angiogenesis-via-activating-platelet-derived-growth-factor-d
#19
Jie Ma, Yuanyuan Zhao, Li Sun, Xiaochun Sun, Xiaosu Zhao, Xiaoxian Sun, Hui Qian, Wenrong Xu, Wei Zhu
We have previously demonstrated the cardioprotective effects of exosomes derived from mesenchymal stem cells (MSCs). It is well known that the activation of Akt is involved in stem cell-induced cardioprotection. In the present study, we investigated whether exosomes released from Akt-overexpressing MSCs showed a beneficial effect on cardioprotection and angiogenesis. MSCs were collected from human umbilical cord (hucMSCs), and Akt was transfected into hucMSCs (Akt-hucMSCs) by using an adenovirus transfection system...
January 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28169391/an-anti-fouling-nanoplasmonic-sers-substrate-for-trapping-and-releasing-a-cationic-fluorescent-tag-from-human-blood-solution
#20
Kundan Sivashanmugan, Po-Chun Liu, Kai-Wei Tsai, Ying-Nien Chou, Chen-Hsueh Lin, Yung Chang, Ten-Chin Wen
In bioenvironmental detection, surface-enhanced Raman scattering (SERS) signals are greatly affected by anti-specific biomolecule adsorption, which generates strong background noise, reducing detection sensitivity and selectivity. It is thus necessary to modify the SERS substrate surface to make it anti-fouling to maintain excellent SERS signals. Herein, we propose a zwitterionic copolymer, namely poly(glycidyl methacrylate-co-sulfobetaine methacrylate) (poly(GMA-co-SBMA)), for the surface modification of SERS substrates, which were fabricated and characterized spectroscopically...
February 7, 2017: Nanoscale
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