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Troponin I

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https://www.readbyqxmd.com/read/28545521/clinical-serological-and-echocardiographic-examination-of-healthy-field-dogs-before-and-after-vaccination-with-a-commercial-tetravalent-leptospirosis-vaccine
#1
Andrea M Spiri, Sabrina Rodriguez-Campos, José M Matos, Tony M Glaus, Barbara Riond, Claudia E Reusch, Regina Hofmann-Lehmann, Barbara Willi
BACKGROUND: Leptospirosis is a re-emerging bacterial zoonosis caused by spirochetes of the genus Leptospira. Severe disease has been reported in dogs in Europe despite vaccination with bivalent Leptospira vaccines. Recently, a tetravalent canine Leptospira vaccine (Nobivac® L4) was licenced in Europe. The goal of this study was to investigate clinical signs, microscopic agglutination test (MAT) titres, haematology, blood biochemistry, cardiac (c) Troponin I levels and echocardiography before and after vaccination with this tetravalent vaccine...
May 25, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28545334/head-to-head-comparison-of-cardiac-troponin-t-and-troponin-i-in-patients-without-acute-coronary-syndrome-a-systematic-review
#2
Ásthildur Árnadóttir, Christine Falk-Klein, Kasper Iversen
BACKGROUND: Cardiac specific troponin T (cTnT) and troponin I (cTnI) are considered diagnostically equal in patients with acute coronary syndrome (ACS). The aim of this systematic review was to compare the prevalence and prognostic strength of elevations of cTnT and cTnI in patients with other conditions than ACS. METHODS: A systemic review was conducted in concordance with the PRISMA guidelines. The studies were identified by searching PubMed, EMBASE and Cochrane Central Register, through May to August 2016...
May 26, 2017: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://www.readbyqxmd.com/read/28544782/rationale-and-design-of-amphilimus-sirolimus-eluting-stents-versus-zotarolimus-eluting-stents-in-all-comers-requiring-percutaneous-coronary-intervention-recre8-a-multicenter-randomized-clinical-trial
#3
Rik Rozemeijer, Mèra Stein, Peter Frambach, Michiel Voskuil, Adriaan O Kraaijeveld, Ramón Rodríguez-Olivares, Leo Timmers, Bruno Pereira, Saskia Z Rittersma, Pierfrancesco Agostoni, Pieter A Doevendans, Pieter R Stella
BACKGROUND: Amphilimus sirolimus-eluting stents (A-SES) represent a novel elution technology in the current era of drug-eluting stents with promising results in patients with diabetes mellitus. At present no large trial has been designed to evaluate clinical outcomes of A-SES as compared to new-generation drug-eluting stents in unselected patients. Accordingly, we designed this trial to evaluate clinical noninferiority of A-SES as compared with zotarolimus-eluting stents (ZES) in a real-world, all-comers setting...
May 22, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28543763/7-8-3-trihydroxyflavone-protects-h-r-induced-apoptosis-and-induces-in-vivo-growth-of-human-embryonic-stem-cell-derived-cardiomyocytes
#4
Jiaxiang Li, Cuiping Wang, Bao Zhang Baiyun Tang
BACKGROUND: Cellular therapy of human embryonic stem cell-derived cardiomyocytes (hES-CMs) holds great promise for regenerating infarcted cardiac tissues. Yet, the major challenge remains as little cells survived after grafting. In this study, we examined whether treating hES-CMs with 7, 8, 3'-Trihydroxyflavone (THF) may improve hES-CMs developments both in vitro and in vivo. METHOD: HES-CMs were differentiated in vitro, and treated with 5 μ59M THF for 24 h...
May 20, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28543396/functional-and-structural-assessment-of-the-effect-of-human-umbilical-cord-blood-mesenchymal-stem-cells-in-doxorubicin-induced-cardiotoxicity
#5
Somia H Abd Allah, Samia Hussein, Mai M Hasan, Raghda H A Deraz, Wafaa F Hussein, Laila M E Sabik
Cardiomyopathy induced by doxorubicin (DOX) was recognized at an early stage and also several years after drug administration. Mesenchymal stem cells (MSCs) have many properties that make them suitable for preventive and/ or regenerative therapies. In this study, we evaluated the effect of MSCs in the functional and the structural improvement of DOX-induced cardiomyopathy in rats. Ninety adult male albino rats were randomly divided into three equal groups of thirty rats each: Group I (control): rats received normal saline...
May 25, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28542299/preoperative-cardiac-troponin-level-is-associated-with-all-cause-mortality-of-liver-transplantation-recipients
#6
Jungchan Park, Seung Hwa Lee, Sangbin Han, Hyun Sook Jee, Suk-Koo Lee, Gyu-Seong Choi, Gaab Soo Kim
This study was aimed to evaluate the association between preoperative high-sensitivity cardiac troponin I (hs-cTnI) level and mortality in patients undergoing liver transplantation (LT). From January 2011 to May 2016, preoperative hs-cTnI level was measured in consecutive 487 patients scheduled for LT. Patients with elevated preoperative hs-cTnI were compared with those who had normal level. The primary outcome was all-cause death in follow-up period of 30 days to 1 year after operation. Of the 487 patients, 58 (11...
2017: PloS One
https://www.readbyqxmd.com/read/28542130/activation-of-transient-receptor-potential-vanilloid-4-involves-in-hypoxia-reoxygenation-injury-in-cardiomyocytes
#7
Qiong-Feng Wu, Cheng Qian, Ning Zhao, Qian Dong, Jing Li, Bin-Bin Wang, Lei Chen, Lixiu Yu, Bing Han, Yi-Mei Du, Yu-Hua Liao
Transient receptor potential vanilloid 4 (TRPV4) is highly expressed in heart and vessels and can be activated during myocardial ischemia/reperfusion (I/R). Recently, we found that treatment with a selective TRPV4 antagonist HC-067047 significantly reduced infarct size, decreased troponin T levels and improved cardiac function in murine model myocardial I/R. This study was undertaken to investigate the mechanism underlying TRPV4-mediated myocardial I/R injury. To mimic myocardial I/R injury, we established a hypoxia/reoxygenation (H/R) model in H9C2 cells and neonatal rat ventricle myocytes (NRVMs) in vitro...
May 25, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28540577/cooperativity-of-myosin-interaction-with-thin-filaments-is-enhanced-by-stabilizing-substitutions-in-tropomyosin
#8
Daniil V Shchepkin, Salavat R Nabiev, Galina V Kopylova, Alexander M Matyushenko, Dmitrii I Levitsky, Sergey Y Bershitsky, Andrey K Tsaturyan
Muscle contraction is powered by myosin interaction with actin-based thin filaments containing Ca(2+)-regulatory proteins, tropomyosin and troponin. Coiled-coil tropomyosin molecules form a long helical strand that winds around actin filament and either shields actin from myosin binding or opens it. Non-canonical residues G126 and D137 in the central part of tropomyosin destabilize its coiled-coil structure. Their substitutions for canonical ones, G126R and D137L, increase structural stability and the velocity of sliding of reconstructed thin filaments along myosin coated surface...
May 24, 2017: Journal of Muscle Research and Cell Motility
https://www.readbyqxmd.com/read/28535620/a-case-of-false-positive-troponin-i-in-a-patient-affected-by-cryoglobulinemic-vasculitis
#9
M Bellan, M Pirisi, G Bellomo, P P Sainaghi
Troponin I (TnI) false positive results have been reported in patients affected by immune disorders. We report the case of a 74-year-old woman affected by cryoglobulinemic vasculitis, admitted to the Emergency Room because of a lipotimic episode. A marked elevation of TnI plasma concentration was confirmed in multiple determinations, despite the absence of symptoms or electrocardiogram findings suggesting myocardial infarction. TnI plasma concentration was reported normal after re-testing with a different commercial kit...
May 22, 2017: Reumatismo
https://www.readbyqxmd.com/read/28533752/protocatechuic-acid-a-phenolic-from-sansevieria-roxburghiana-leaves-suppresses-diabetic-cardiomyopathy-via-stimulating-glucose-metabolism-ameliorating-oxidative-stress-and-inhibiting-inflammation
#10
Niloy Bhattacharjee, Tarun K Dua, Ritu Khanra, Swarnalata Joardar, Ashis Nandy, Achintya Saha, Vincenzo De Feo, Saikat Dewanjee
Persistent hyperglycemia, impairment of redox status and establishment of inflammatory pathophysiology integrally play important role in the pathogenesis of diabetic cardiomyopathy (DC). Present study examined the therapeutic potential of protocatechuic acid isolated from the Sansevieria roxburghiana rhizomes against DC employing rodent model of type 2 diabetes (T2D). T2D was induced by high fat diet + a low-single dose of streptozotocin (35 mg/kg, i.p.). T2D rats exhibited significantly (p < 0.01) high fasting blood glucose level...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28533433/changes-in-the-dynamics-of-the-cardiac-troponin-c-molecule-explain-the-effects-of-ca-2-sensitizing-mutations
#11
Charles M Stevens, Kaveh Rayani, Gurpreet Singh, Bairam Lotfalisalmasi, D Peter Tieleman, Glen F Tibbits
Cardiac troponin C (cTnC) is the regulatory protein that initiates cardiac contraction in response to Ca(2+) TnC binding Ca(2+) initiates a cascade of protein-protein interactions that begins with the opening of the N-terminal domain of cTnC, followed by cTnC binding the Troponin I switch peptide (TnISW). We have evaluated, through isothermal titration calorimetry (ITC) and MD simulation, the effect of several clinically relevant mutations (A8V, L29Q, A31S, L48Q, Q50R and C84Y) on the Ca(2+) affinity, structural dynamics, and calculated interaction strengths between cTnC and each of Ca(2+) and TnISW Surprisingly the Ca(2+) affinity measured by ITC was only significantly affected by half of these mutations, with the exceptions of the L48Q, Q50R and C84Y mutants, which had an affinity 10-fold, 3-fold and 3-fold higher than wild-type, respectively...
May 22, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28533194/mortality-in-cardiac-surgery-myriad-a-randomized-controlled-trial-of-volatile-anesthetics-rationale-and-design
#12
Giovanni Landoni, Vladimir Lomivorotov, Antonio Pisano, Caetano Nigro Neto, Umberto Benedetto, Giuseppe Biondi Zoccai, Marco Gemma, Samuele Frassoni, Felice Eugenio Agrò, Massimo Baiocchi, Filomena R Barbosa Gomes Galas, Andrei Bautin, Nikola Bradic, Cristiana Carollo, Giuseppe Crescenzi, Abeer Elnakera, Mohamed R El-Tahan, Evgeny Fominskiy, Ahmed G Farag, Gordana Gazivoda, Stefano Gianni, Evgeny Grigoryev, Fabio Guarracino, Sidik Hanafi, Weiqing Huang, Gudrun Kunst, Jan Kunstyr, Chong Lei, Rosalba Lembo, Zhi-Jian Li, Valery Likhvantsev, Andrey Lozovskiy, Jun Ma, Fabrizio Monaco, Paolo Navalesi, Bukamal Nazar, Vadim Pasyuga, Elena Porteri, Colin Royse, Laura Ruggeri, Hynek Ryha, Fernanda Santos Silva, Luca Severi, Vladimir Shmyrev, Nikolay Uvaliev, Cheng Bin Wang, Chew-Yin Wang, Dario Winterton, Chow-Yen Yong, Jingui Yu, Rinaldo Bellomo, Alberto Zangrillo
OBJECTIVE: There is initial evidence that the use of volatile anesthetics can reduce the postoperative release of cardiac troponin I, the need for inotropic support, and the number of patients requiring prolonged hospitalization following coronary artery bypass graft (CABG) surgery. Nevertheless, small Randomized Controlled Trials have failed to demonstrate a survival advantage. Thus, whether volatile anesthetics improve the postoperative outcome of cardiac surgical patients remains uncertain...
May 19, 2017: Contemporary Clinical Trials
https://www.readbyqxmd.com/read/28533142/evaluation-of-plasma-sphingosine-1-phosphate-hepcidin-and-cardiovascular-damage-biomarkers-cardiac-troponin-i-and-homocysteine-in-rats-infected-with-brucellosis-and-vaccinated-rev-1-rb-51
#13
Kaveh Azimzadeh, Reza Nasrollahi Nargesabad, Nasim Vousooghi
Brucellosis is known as one of important zoonosis. Studying the histological and biochemical effects of the disease could help to increase our knowledge about it. The aim of the present study was to evaluate changes of plasma parameters after intraperitoneal injection of two species of Brucella (Brucella melitensis and Brucella abortus) and two vaccines (Rev-1, RB-51) in the rat. Forty male rats were divided into five groups (n = 8 in each group). Two groups received suspensions of Brucella abortus and Brucella melitensis and two other groups were injected intraperitoneally with two mentioned vaccines and the last group received only distilled water...
May 19, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28530094/troponin-c-mutations-partially-stabilize-the-active-state-of-regulated-actin-and-fully-stabilize-the-active-state-when-paired-with-%C3%AE-14-tnt
#14
Tamatha Baxley, Dylan Johnson, Jose Renato Pinto, Joseph Michael Chalovich
Striated muscle contraction is regulated by the actin associated proteins tropomyosin and troponin. Activation of myosin ATPase activity is lowest in the absence of both Ca2+ and activating crossbridges (i.e. S1-ADP or rigor S1). Binding of activating species of myosin to actin at saturating Ca2+ stabilizes the most active state (M state) of actin-tropomyosin-troponin (regulated actin). Ca2+ binding alone produces partial stabilization of the active state. The extent of stabilization at saturating Ca2+ depends on the isoform of the troponin subunits, the phosphorylation state of troponin and, in the case of cardiac muscle, the presence of hypertrophic cardiomyopathy producing mutants of troponin T and troponin I...
May 22, 2017: Biochemistry
https://www.readbyqxmd.com/read/28528953/composite-poly-lactic-acid-chitosan-nanofibrous-scaffolds-for-cardiac-tissue-engineering
#15
Yaowen Liu, Shuyao Wang, Rong Zhang
Fibrous scaffolds with different ratios of poly (lactic acid) (PLA) and chitosan were fabricated by conventional electrospinning. After crosslinking by the glutaraldehyde vapor, the structure, mechanical properties, hydrophilicity, and in-fiber chemical interactions of the scaffolds were investigated. We found that the fiber diameter decreased with the concentration of chitosan, while mechanical properties and hydrophilicity improved. In addition, we found that scaffolds with aligned fibers have higher mechanical strength and biocompatibility than scaffolds with randomly oriented fibers...
May 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28528430/risk-classification-of-highly-sensitive-troponin-i-predict-presence-of-vulnerable-plaque-assessed-by-dual-source-coronary-computed-tomography-angiography
#16
Ting Liu, Guan Wang, Peiling Li, Xu Dai
Patients presenting to the emergency department with acute chest pain, negative conventional troponin and electrocardiogram require serial testing to rule out acute coronary syndrome (ACS). We studied the association of highly sensitive troponin (hsTn) I with vulnerable plaque features as detected by coronary dual source computed tomography angiography (DSCTA) and determined whether hsTn I at the time of presentation combined with early DSCTA could improve classification of patients as high-risk or low risk for ACS...
May 20, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28525735/structure-based-rational-design-of-self-inhibitory-peptides-to-disrupt-the-intermolecular-interaction-between-the-troponin-subunits-c-and-i-in-neuropathic-pain
#17
Junmin Yu, Shilei Wang, Junjie Yu, Chuansheng Liu, Fenghe Xu, Shijie Wang, Yusheng Yi, Yanwei Yin
The troponin (Tn) is a ternary complex consisting of three subunits TnC, TnI and TnT; molecular disruption of the Tn complex has been recognized as an attractive strategy against neuropathic pain. Here, a self-inhibitory peptide is stripped from the switch region of TnI interaction interface with TnC, which is considered as a lead molecular entity and then used to generate potential peptide disruptors of TnC-TnI interaction based on a rational molecular design protocol. The region is a helical peptide segment capped by N- and C-terminal disorders...
May 3, 2017: Bioorganic Chemistry
https://www.readbyqxmd.com/read/28523165/plasma-levels-of-matrix-metalloproteinase-9-in-patients-undergoing-off-pump-coronary-artery-bypass-grafting
#18
Haiqing Li, Zhize Yuan, Sen Li, Quan Qi, Jun Liu, Mi Zhou, Junfeng Cai, Anqing Chen, Zhe Wang, Xiaofeng Ye, Qiang Zhao
BACKGROUND: Matrix metalloproteinase 9 (MMP9) has recently emerged as a risk predictor in patients with cardiovascular diseases. However, little is known about the significance of increased plasma MMP9 in patients with perioperative myocardial injury. We aimed to investigate the role of MMP9 in the occurrence of myocardial injury during off-pump coronary artery bypass grafting (OPCAB). METHODS: A total of 34 consecutive patients with coronary artery diseases (CAD) were recruited in this prospective, observational study...
April 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28516829/factors-associated-with-failure-of-emergency-wait-time-targets-for-high-acuity-discharges-and-intensive-care-unit-admissions
#19
Ivy Cheng, Merrick Zwarenstein, Alex Kiss, Maaret Castren, Mats Brommels, Michael Schull
OBJECTIVE: Ontario established emergency department length-of-stay (EDLOS) targets but has difficulty achieving them. We sought to determine predictors of target time failure for discharged high acuity patients and intensive care unit (ICU) admissions. METHODS: This was a retrospective, observational study of 2012 Sunnybrook Hospital emergency department data. The main outcome measure was failing to meet government EDLOS targets for high acuity discharges and ICU emergency admissions...
May 18, 2017: CJEM
https://www.readbyqxmd.com/read/28513852/effect-of-pentoxifylline-in-ameliorating-myocardial-injury-in-patients-with-myocardial-infarction-undergoing-thrombolytic-therapy-a-pilot-randomized-clinical-trial
#20
Hossein Namdar, Rasoul Zohori, Naser Aslanabadi, Taher Entezari-Maleki
Cell death following acute myocardial infarction (MI) is the hallmark pathology of cardiovascular disease, leading to considerable mortality and morbidity. Platelet and neutrophil activation and inflammatory cytokines, prominently TNF-α, play an important role in the development of cell death. Because pentoxifylline inhibits platelet and neutrophil activation and reduces TNF-α, this study was performed to assess the potential benefit of pentoxifylline in the reduction of myocardial injury following acute MI...
May 17, 2017: Journal of Clinical Pharmacology
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