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https://www.readbyqxmd.com/read/29339919/effect-of-oral-tranexamic-acid-on-macular-edema-associated-with-retinal-vein-occlusion-or-diabetes
#1
Masayuki Takeyama, Fumio Takeuchi, Masahiko Gosho, Keijiro Sugita, Masahiro Zako, Masayoshi Iwaki, Motohiro Kamei
Purpose: Tranexamic acid (TXA) is a widely used antifibrinolytic agent that can also cause a decrease in vascular permeability. We hypothesized that TXA could improve macular edema (ME) that is caused by an increase in retinal vascular permeability. The aim of this study is to evaluate the efficacy of oral TXA for ME associated with retinal vein occlusion (RVO) or diabetic ME (DME). Patients and methods: Oral TXA (1,500 mg daily for 2 weeks) was administered to patients with persistent ME secondary to RVO (7 eyes) and DME (7 eyes)...
2018: Clinical Ophthalmology
https://www.readbyqxmd.com/read/29324486/fibrinolysis-and-antifibrinolytic-treatment-in-the-trauma-patient
#2
Lewis S Gall, Ross A Davenport
PURPOSE OF REVIEW: The role of antifibrinolytics in trauma haemorrhage and early coagulopathy remains controversial with respect to patient selection, dosage, timing of treatment, and risk of thrombotic complications. This review presents our current understanding of the mechanisms of fibrinolysis in trauma, diagnostic evaluation, and the evidence base for treatment. RECENT FINDINGS: Excessive fibrinolysis following severe injury is a major component of acute traumatic coagulopathy and contributes to the high mortality from trauma haemorrhage...
January 10, 2018: Current Opinion in Anaesthesiology
https://www.readbyqxmd.com/read/29324332/impaired-plasminogen-binding-in-patients-with-venous-thromboembolism-association-with-protein-carbonylation
#3
Jakub Siudut, Joanna Natorska, Michal Zabczyk, Dorota Zajac, Karolina Seweryn, Maria Rąpała-Kozik, Anetta Undas
INTRODUCTION: Venous thromboembolism (VTE) is associated with hypofibrinolysis. Its mechanisms are poorly understood. We investigated plasminogen-fibrin interaction and its association with fibrinolytic capacity and protein oxidation/carbonylation in VTE patients. MATERIALS AND METHODS: Plasma-purified plasminogen conversion to plasmin and surface plasmon resonance employed for plasminogen-fibrin interactions were individually evaluated in all healthy controls and non-anticoagulated patients following VTE, 10-23months since the event...
January 5, 2018: Thrombosis Research
https://www.readbyqxmd.com/read/29322934/computational-analysis-reveals-the-coupling-between-bistability-and-the-sign-of-a-feedback-loop-in-a-tgf-%C3%AE-1-activation-model
#4
Huipeng Li, Lakshmi Venkatraman, Balakrishnan Chakrapani Narmada, Jacob K White, Hanry Yu, Lisa Tucker-Kellogg
BACKGROUND: Bistable behaviors are prevalent in cell signaling and can be modeled by ordinary differential equations (ODEs) with kinetic parameters. A bistable switch has recently been found to regulate the activation of transforming growth factor-β1 (TGF-β1) in the context of liver fibrosis, and an ordinary differential equation (ODE) model was published showing that the net activation of TGF-β1 depends on the balance between two antagonistic sub-pathways. RESULTS: Through modeling the effects of perturbations that affect both sub-pathways, we revealed that bistability is coupled with the signs of feedback loops in the model...
December 21, 2017: BMC Systems Biology
https://www.readbyqxmd.com/read/29321425/elevation-of-plasmin-%C3%AE-2-plasmin-inhibitor-complexes-in-patients-with-al-amyloidosis
#5
Kanji Miyazaki, Kenshi Suzuki
No abstract text is available yet for this article.
January 11, 2018: Internal Medicine
https://www.readbyqxmd.com/read/29318541/biotin-chasing-assay-to-evaluate-upar-stability-and-cleavage-on-the%C3%A2-surface-of-cells
#6
Vladimir Leksa, Herbert B Schiller, Hannes Stockinger
The plasminogen activation system, i.e., the fibrinolytic system, is one of the major plasma proteolytic pathways. The proteolytic conversion of the zymogen plasminogen to the active serine protease plasmin is on the cell surface catalyzed by the serine protease urokinase-type plasminogen activator (urokinase, uPA). Upon binding to the urokinase receptor (uPAR, CD87), single-chain pro-uPA is processed to double-chain uPA which in turn specifically converts cell-bound plasminogen to plasmin. Plasmin is harnessed in many physiological processes, e...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29306228/emergency-coronary-bypass-surgery-in-patients-under-the-influence-of-dualantiplatelet-therapy-effects-of-tranexamic-acid-and-desmopressin-acetate
#7
Gökalp Altun, Doğuş Hemşinli, Zerrin Pulathan, Ali Civelek
Background/aim: Bleeding in patients undergoing coronary artery bypass grafting (CABG) while using dual antiplatelet therapy (DAPT) is a cause of significant morbidity and mortality. The aim of this study is to examine the perioperative hemostatic effects of tranexamic acid (TnX-A) and desmopressin acetate (Des) in these patients. Materials and methods: This clinical study was planned in a prospective and randomized manner. Fifty-four patients were enrolled and classified into 4 different groups. They were compared in terms of various bleeding and transfusion parameters...
December 19, 2017: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/29305116/urine-albumin-is-a-superior-predictor-of-preeclampsia-compared-to-urine-plasminogen-in-type-i-diabetes-patients
#8
Lise Hald Nielsen, Boye L Jensen, Jens Fuglsang, Lise Lotte Torvin Andersen, Dorte Møller Jensen, Jan Stener Jørgensen, Gitte Kitlen, Per Ovesen
Pregnant women with type I diabetes mellitus (T1DM) are at increased risk of developing preeclampsia (PE). Plasminogen is aberrantly filtrated from plasma into tubular fluid in PE patients and activated to plasmin. Plasmin activates the epithelial sodium channel in the collecting ducts potentially causing impaired sodium excretion, suppression of the renin-angiotensin-aldosterone system, and hypertension in PE. The objective of the study was to test whether urinary total plasmin(ogen)/creatinine ratio and plasma concentration of aldosterone were better predictors of PE in pregnant women with T1DM compared with urine albumin and haemoglobin A1C...
December 13, 2017: Journal of the American Society of Hypertension: JASH
https://www.readbyqxmd.com/read/29304073/tissue-type-plasminogen-activator-contributes-to-remodeling-of-the-rat-ductus-arteriosus
#9
Junichi Saito, Utako Yokoyama, Naoki Nicho, Yun-Wen Zheng, Yasuhiro Ichikawa, Satoko Ito, Masanari Umemura, Takayuki Fujita, Shuichi Ito, Hideki Taniguchi, Toshihide Asou, Munetaka Masuda, Yoshihiro Ishikawa
AIMS: The ductus arteriosus (DA) closes after birth to adapt to the robust changes in hemodynamics, which require intimal thickening (IT) to occur. The smooth muscle cells of the DA have been reported to play important roles in IT formation. However, the roles of the endothelial cells (ECs) have not been fully investigated. We herein focused on tissue-type plasminogen activator (t-PA), which is a DA EC dominant gene, and investigated its contribution to IT formation in the DA. METHODS AND RESULTS: ECs from the DA and aorta were isolated from fetal rats using fluorescence-activated cell sorting...
2018: PloS One
https://www.readbyqxmd.com/read/29296957/%C3%AE-iib%C3%AE-3-binding-to-a-fibrinogen-fragment-lacking-the-%C3%AE-chain-dodecapeptide-is-activation-dependent-and-edta-inducible
#10
Hina Zafar, Yi Shang, Jihong Li, George A David, Joseph P Fernandez, Henrik Molina, Marta Filizola, Barry S Coller
Platelet integrin receptor αIIbβ3 supports platelet aggregation by binding fibrinogen. The interaction between the fibrinogen C-terminal γ-chain peptide composed of residues γ-404-411 (GAKQAGDV) and the Arg-Gly-Asp (RGD) binding pocket on αIIbβ3 is required for fibrinogen-mediated platelet aggregation, but data suggest that other ancillary binding sites on both fibrinogen and αIIbβ3 may lead to higher-affinity fibrinogen binding and clot retraction. To identify additional sites, we analyzed the ability of platelets and cells expressing normal and mutant αIIbβ3 to adhere to an immobilized fibrinogen plasmin fragment that lacks intact γ-404-411 ('D98')...
February 28, 2017: Blood Advances
https://www.readbyqxmd.com/read/29296720/x-ray-crystal-structure-of-plasmin-with-tranexamic-acid-derived-active-site-inhibitors
#11
Ruby H P Law, Guojie Wu, Eleanor W W Leung, Koushi Hidaka, Adam J Quek, Tom T Caradoc-Davies, Devadharshini Jeevarajah, Paul J Conroy, Nigel M Kirby, Raymond S Norton, Yuko Tsuda, James C Whisstock
The zymogen protease plasminogen and its active form plasmin perform key roles in blood clot dissolution, tissue remodeling, cell migration, and bacterial pathogenesis. Dysregulation of the plasminogen/plasmin system results in life-threatening hemorrhagic disorders or thrombotic vascular occlusion. Accordingly, inhibitors of this system are clinically important. Currently, tranexamic acid (TXA), a molecule that prevents plasminogen activation through blocking recruitment to target substrates, is the most widely used inhibitor for the plasminogen/plasmin system in therapeutics...
May 9, 2017: Blood Advances
https://www.readbyqxmd.com/read/29288468/interactions-between-bradykinin-and-plasmin-in-the-endothelial-ca2-response
#12
Yukako Obata, Kazuhiko Takeuchi, Jiazhang Wei, Akio Hakamata, Keiichi Odagiri, Yoshiki Nakajima, Hiroshi Watanabe
Plasmin is a fibrinolytic factor and a serine protease that activates protease-activated receptors (PARs) to produce endothelium-derived relaxing factors such as nitric oxide and prostacyclin. Nitric oxide and prostacyclin production is regulated, at least in part, by the intracellular Ca2+ concentration in various blood vessel types. Bradykinin and plasmin stimulate vascular endothelial cells and work simultaneously in pathophysiological conditions such as thrombosis and inflammation. Here, we explored the interactions between bradykinin and plasmin in the endothelial Ca2+ response using the fluorescent indicator, Fura-2/AM, in primary cultures of porcine aortic endothelial cells (PAECs)...
December 29, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29261568/platelet-drop-and-fibrinolytic-shutdown-in-patients-with-sepsis
#13
Fabrizio Semeraro, Mario Colucci, Pietro Caironi, Serge Masson, Concetta T Ammollo, Roberto Teli, Nicola Semeraro, Michela Magnoli, Giovanni Salati, Michele Isetta, Mauro Panigada, Tommaso Tonetti, Gianni Tognoni, Roberto Latini, Antonio Pesenti, Luciano Gattinoni
OBJECTIVE: Thrombocytopenia is the most common hemostatic disorder during sepsis and is associated with high mortality. We examined whether fibrinolytic changes precede incident thrombocytopenia and predict outcome in patients with severe sepsis. DESIGN: Nested study from the multicenter, randomized, controlled trial on the efficacy of albumin replacement in severe sepsis or septic shock (the Albumin Italian Outcome Sepsis trial). SETTING: Forty ICUs in Italy...
December 19, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/29249727/expression-purification-and-biological-characterization-of-anaplasma-phagocytophilum-enolase
#14
Xiaoge Gao, Chen Zheng, Xiangye Liu
The obligate intracellular bacteria Anaplasma phagocytophilum is the etiological agent of human granulocytic anaplasmosis (HGA), an acute febrile tick-borne disease. A. phagocytophilum has a complex lifecycle within both vertebrate reservoirs and tick vectors, and employs a range of different molecules to infect and multiply within the host cells. Enolase is an essential glycolytic enzyme in intracellular glucose metabolism, but is also a multifunctional protein expressed on the pathogen surface, that binds to and promotes plasminogen conversion to plasmin...
December 17, 2017: Bioscience Trends
https://www.readbyqxmd.com/read/29247447/relationships-of-oxidized-hdl-with-blood-coagulation-and-fibrinolysis-in-patients-with-type-2-diabetes-mellitus
#15
Shigeyuki Ebara, Mikio Marumo, Jun Mukai, Makoto Ohki, Kagehiro Uchida, Ichiro Wakabayashi
Although oxidization of LDL is known to be a crucial step for atherosclerotic progression, the significance of oxidized HDL remains to be clarified. The purpose of this study was to determine the relationships of oxidized HDL with blood coagulation and fibrinolysis in patients with diabetes. The subjects were outpatients with type 2 diabetes (n = 163; median hemoglobin A1c, 6.9%). Activities of blood coagulation and fibrinolysis were evaluated by levels of thrombin-anti-thrombin complex (TAT) and plasmin-α2 plasmin inhibitor complex (PIC), respectively...
December 15, 2017: Journal of Thrombosis and Thrombolysis
https://www.readbyqxmd.com/read/29237166/kallikrein-cleaves-c3-and-activates-complement
#16
Sarah Irmscher, Nadia Döring, Luke D Halder, Emeraldo A H Jo, Isabell Kopka, Christine Dunker, Ilse D Jacobsen, Shanshan Luo, Hortense Slevogt, Stefan Lorkowski, Niklas Beyersdorf, Peter F Zipfel, Christine Skerka
The human plasma contact system is an immune surveillance system activated by the negatively charged surfaces of bacteria and fungi and includes the kallikrein-kinin, the coagulation, and the fibrinolytic systems. Previous work shows that the contact system also activates complement, and that plasma enzymes like kallikrein, plasmin, thrombin, and FXII are involved in the activation process. Here, we show for the first time that kallikrein cleaves the central complement component C3 directly to yield active components C3b and C3a...
December 14, 2017: Journal of Innate Immunity
https://www.readbyqxmd.com/read/29236656/secondary-syphilis-associated-with-membranous-nephropathy-and-acute-hepatitis-in-a-patient-with-hiv-a-case-report
#17
Zhou Zhang, Aviv Hever, Nitin Bhasin, Dean A Kujubu
INTRODUCTION: We present a case of membranous nephropathy associated with a secondary syphilis infection in a patient with HIV. CASE PRESENTATION: A 37-year-old white man with HIV who was receiving highly active antiretroviral therapy presented to the Emergency Department with 6 weeks of rectal pain. He had a CD3-CD4 count of 656 cells/mm3 and an undetectable viral load. On admission, he was found to have an anal ulcer, a serum creatinine of 1.4 mg/dL (baseline 0...
2017: Permanente Journal
https://www.readbyqxmd.com/read/29228282/proteolytic-inactivation-of-adamts13-by-plasmin-in-human-plasma-risk-of-thrombotic-thrombocytopenic-purpura
#18
Yongchol Shin, Haruki Miyake, Kenshi Togashi, Ryuichi Hiratsuka, Kana Endou-Ohnishi, Yasutada Imamura
Thrombotic thrombocytopenic purpura (TTP) is caused by inactivation of a von Willebrand factor (VWF)-cleaving enzyme, ADAMTS13, which leads to platelet-rich thrombi comprising unusually large VWF multimers. We have found that ADAMTS13 can bind to the inactivated form of plasmin. In addition, plasmin cleaves purified ADAMTS13 into several fragments and inactivates it. Hence, we hypothesized that activation of plasminogen to plasmin becomes a new-onset factor for TTP due to ADAMTS13 inactivation. Plasmin was added exogenously or activated from plasminogen by streprokinase addition in HP...
December 7, 2017: Journal of Biochemistry
https://www.readbyqxmd.com/read/29217666/epac1-regulates-endothelial-annexin-a2-cell-surface-translocation-and-plasminogen-activation
#19
Wenli Yang, Fang C Mei, Xiaodong Cheng
Annexins, a family of highly conserved calcium- and phospholipid-binding proteins, play important roles in a wide range of physiologic functions. Among the 12 known annexins in humans, annexin A2 (AnxA2) is one of the most extensively studied and has been implicated in various human diseases. AnxA2 can exist as a monomer or a heterotetrameric complex with S100A10 (P11) and plays a critical role in many cellular processes, including exocytosis, endocytosis, and membrane organization. At the endothelial cell surface, the (AnxA2·P11)2 tetramer-acting as a coreceptor for plasminogen and tissue plasminogen activator (tPA)-accelerates tPA-dependent activation of the fibrinolytic protease, plasmin, the enzyme that is responsible for thrombus dissolution and the degradation of fibrin...
December 7, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29206190/direct-fibrinolytic-snake-venom-metalloproteinases-affecting-hemostasis-structural-biochemical-features-and-therapeutic-potential
#20
REVIEW
Eladio F Sanchez, Renzo J Flores-Ortiz, Valeria G Alvarenga, Johannes A Eble
Snake venom metalloproteinases (SVMPs) are predominant in viperid venoms, which provoke hemorrhage and affect hemostasis and thrombosis. P-I class enzymes consist only of a single metalloproteinase domain. Despite sharing high sequence homology, only some of them induce hemorrhage. They have direct fibrin(ogen)olytic activity. Their main biological substrate is fibrin(ogen), whose Aα-chain is degraded rapidly and independently of activation of plasminogen. It is important to understand their biochemical and physiological mechanisms, as well as their applications, to study the etiology of some human diseases and to identify sites of potential intervention...
December 5, 2017: Toxins
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