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Omecamtiv

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https://www.readbyqxmd.com/read/28775348/mechanistic-and-structural-basis-for-activation-of-cardiac-myosin-force-production-by-omecamtiv-mecarbil
#1
Vicente J Planelles-Herrero, James J Hartman, Julien Robert-Paganin, Fady I Malik, Anne Houdusse
Omecamtiv mecarbil is a selective, small-molecule activator of cardiac myosin that is being developed as a potential treatment for heart failure with reduced ejection fraction. Here we determine the crystal structure of cardiac myosin in the pre-powerstroke state, the most relevant state suggested by kinetic studies, both with (2.45 Å) and without (3.10 Å) omecamtiv mecarbil bound. Omecamtiv mecarbil does not change the motor mechanism nor does it influence myosin structure. Instead, omecamtiv mecarbil binds to an allosteric site that stabilizes the lever arm in a primed position resulting in accumulation of cardiac myosin in the primed state prior to onset of cardiac contraction, thus increasing the number of heads that can bind to the actin filament and undergo a powerstroke once the cardiac cycle starts...
August 4, 2017: Nature Communications
https://www.readbyqxmd.com/read/28506910/omecamtiv-mecarbil-activates-ryanodine-receptors-from-canine-cardiac-but-not-skeletal-muscle
#2
Péter Nánási, Marta Gaburjakova, Jana Gaburjakova, János Almássy
Due to the limited results achieved in the clinical treatment of heart failure, a new inotropic strategy of myosin motor activation has been developed. The lead molecule of myosin activator agents is omecamtiv mecarbil, which binds directly to the heavy chain of the cardiac β-myosin and enhances cardiac contractility by lengthening the lifetime of the acto-myosin complex and increasing the number of the active force-generating cross-bridges. In the absence of relevant data, the effect of omecamtiv mecarbil on canine cardiac ryanodine receptors (RyR 2) has been investigated in the present study by measuring the electrical activity of single RyR 2 channels incorporated into planar lipid bilayer...
May 13, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28375036/new-developments-in-the-pharmacotherapeutic-management-of-heart-failure-in-elderly-patients-concerns-and-considerations
#3
REVIEW
Elles M Screever, Wouter C Meijers, Dirk J van Veldhuisen, Rudolf A de Boer
Heart failure (HF) remains a major public health problem worldwide, affecting approximately 23 million patients, and is predominantly a disease of the elderly population. Elderly patients mostly suffer from HF with preserved ejection fraction (HFpEF), which often presents with multiple co-morbidities and they require multiple medical treatments. This, together with the heterogeneous phenotype of HFpEF, makes it a difficult syndrome to diagnose and treat. Areas covered: Although HF is most abundant in the elderly, this group is still underrepresented in clinical trials, which results in the lack of evidence-based medical regimens...
May 2017: Expert Opinion on Pharmacotherapy
https://www.readbyqxmd.com/read/28357714/the-role-for-cardiovascular-remodeling-in-cardiovascular-outcomes
#4
REVIEW
Nishant Krishna Sekaran, Anna Lisa Crowley, Fernanda Rodrigues de Souza, Elmiro Santos Resende, Sunil V Rao
PURPOSE OF REVIEW: Ischemic and non-ischemic injury to the heart causes deleterious changes in ventricular size, shape, and function. This adverse remodeling is mediated by neurohormonal and hemodynamic alterations and is reflected in non-invasive measures of left ventricular ejection fraction (LVEF), left ventricular end-systolic volume (LVESV), and left ventricular end-diastolic volume (LVEDV). These measures are closely linked to cardiovascular outcomes and have become key surrogate endpoints for evaluating the therapeutic efficacy of contemporary treatments for heart failure with reduced ejection fraction (HFrEF)...
May 2017: Current Atherosclerosis Reports
https://www.readbyqxmd.com/read/28315072/direct-myosin-activation-by-omecamtiv-mecarbil-for-heart-failure-with-reduced-ejection-fraction
#5
Mitchell A Psotka, John R Teerlink
Myosin is the indispensable molecular motor that utilizes chemical energy to produce force for contraction within the cardiac myocyte. Myosin activity is gated by intracellular calcium levels which are regulated by multiple upstream signaling cascades that can be altered for clinical utility using inotropic medications. In contrast to clinically available cardiac inotropes, omecamtiv mecarbil is a novel direct myosin activator developed to augment left ventricular systolic function without the undesirable secondary effects of altered calcium homeostasis...
March 18, 2017: Handbook of Experimental Pharmacology
https://www.readbyqxmd.com/read/28223517/heart-failure-drug-changes-the-mechanoenzymology-of-the-cardiac-myosin-powerstroke
#6
John A Rohde, David D Thomas, Joseph M Muretta
Omecamtiv mecarbil (OM), a putative heart failure therapeutic, increases cardiac contractility. We hypothesize that it does this by changing the structural kinetics of the myosin powerstroke. We tested this directly by performing transient time-resolved FRET on a ventricular cardiac myosin biosensor. Our results demonstrate that OM stabilizes myosin's prepowerstroke structural state, supporting previous measurements showing that the drug shifts the equilibrium constant for myosin-catalyzed ATP hydrolysis toward the posthydrolysis biochemical state...
March 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27974808/heart-failure-phase-ii-trial-results-of-omecamtiv-mecarbil
#7
Gregory B Lim
No abstract text is available yet for this article.
February 2017: Nature Reviews. Cardiology
https://www.readbyqxmd.com/read/27914656/chronic-oral-study-of-myosin-activation-to-increase-contractility-in-heart-failure-cosmic-hf-a-phase-2-pharmacokinetic-randomised-placebo-controlled-trial
#8
RANDOMIZED CONTROLLED TRIAL
John R Teerlink, G Michael Felker, John J V McMurray, Scott D Solomon, Kirkwood F Adams, John G F Cleland, Justin A Ezekowitz, Assen Goudev, Peter Macdonald, Marco Metra, Veselin Mitrovic, Piotr Ponikowski, Pranas Serpytis, Jindrich Spinar, János Tomcsányi, Hans J Vandekerckhove, Adriaan A Voors, Maria Laura Monsalvo, James Johnston, Fady I Malik, Narimon Honarpour
BACKGROUND: Impaired contractility is a feature of heart failure with reduced ejection fraction. We assessed the pharmacokinetics and effects on cardiac function and structure of the cardiac myosin activator, omecamtiv mecarbil. METHODS: In this randomised, double-blind study, done at 87 sites in 13 countries, we recruited patients with stable, symptomatic chronic heart failure and left ventricular ejection fraction 40% or lower. Patients were randomly assigned equally, via an interactive web response system, to receive 25 mg oral omecamtiv mecarbil twice daily (fixed-dose group), 25 mg twice daily titrated to 50 mg twice daily guided by pharmacokinetics (pharmacokinetic-titration group), or placebo for 20 weeks...
December 10, 2016: Lancet
https://www.readbyqxmd.com/read/27779469/dose-dependent-electrophysiological-effects-of-the-myosin-activator-omecamtiv-mecarbil-in-canine-ventricular-cardiomyocytes
#9
N Szentandrassy, B Horvath, K Vaczi, K Kistamas, L Masuda, J Magyar, T Banyasz, Z Papp, P P Nanasi
Omecamtiv mecarbil (OM) is a myosin activator agent recently developed for treatment of heart failure. Although its action on extending systolic ejection time and increasing left ventricular ejection fraction is well documented, no data is available regarding its possible side-effects on cardiac ion channels. Therefore, the present study was designed to investigate the effects of OM on action potential morphology and the underlying ion currents in isolated canine ventricular myocytes using sharp microelectrodes, conventional patch clamp, and action potential voltage clamp techniques...
August 2016: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/27769970/evolving-therapies-for-the-management-of-chronic-and-acute-decompensated-heart-failure
#10
Jennifer C Cook, Richard H Tran, J Herbert Patterson, Jo E Rodgers
PURPOSE: The pharmacology, clinical efficacy, and safety profiles of evolving therapies for the management of chronic heart failure (HF) and acute decompensated heart failure (ADHF) are described. SUMMARY: HF confers a significant financial burden despite the widespread use of traditional guideline-directed medical therapies such as angiotensin-converting enzyme inhibitors, angiotensin receptor blockers, β-blockers, and aldosterone receptor antagonists, and the rates of HF-related mortality and hospitalization have remained unacceptably high...
November 1, 2016: American Journal of Health-system Pharmacy: AJHP
https://www.readbyqxmd.com/read/27629389/incorporating-development-of-a-patient-reported-outcome-instrument-in-a-clinical-drug-development-program-examples-from-a-heart-failure-program
#11
Ingela Wiklund, Milena Anatchkova, Hafiz Oko-Osi, Robyn von Maltzahn, Dina Chau, Fady I Malik, Donald L Patrick, John Spertus, John R Teerlink
BACKGROUND: Patient-reported outcome (PRO) measures can be used to support label claims if they adhere to US Food & Drug Administration guidance. The process of developing a new PRO measure is expensive and time-consuming. We report the results of qualitative studies to develop new PRO measures for use in clinical trials of omecamtiv mecarbil (a selective, small molecule activator of cardiac myosin) for patients with heart failure (HF), as well as the lessons learned from the development process...
September 15, 2016: Health and Quality of Life Outcomes
https://www.readbyqxmd.com/read/27568794/cardiac-myosin-activators-in-systolic-heart-failure-more-friend-than-foe
#12
REVIEW
Danyaal S Moin, Julia Sackheim, Carine E Hamo, Javed Butler
Despite the rising prevalence of HF, new evidence-based novel therapies for patients with worsening HF remain lacking, e.g., safe inotropic therapies. Traditional inotropes increase contractility by altering intracellular calcium flux, a pathway that may be responsible for the multitude of adverse effects associated with current options. Omecamtiv mecarbil, a direct myosin activator, increases contractility through a distinct pathway by increasing the proportion of myosin heads that are bound to actin in a high-affinity state...
October 2016: Current Cardiology Reports
https://www.readbyqxmd.com/read/27545139/novel-therapies-for-heart-failure%C3%A3-where-do-they-stand
#13
REVIEW
Barry Greenberg
Despite advances in therapy, patients with heart failure (HF) continue to experience unacceptably high rates of hospitalization and death, as well as poor quality of life. As a consequence, there is an urgent need for new treatments that can improve the clinical course of the growing worldwide population of HF patients. Serelaxin and ularatide, both based on naturally occurring peptides, have potent vasodilatory as well as other effects on the heart and kidneys. For both agents, phase 3 studies that are designed to determine whether they improve outcomes in patients with acute HF have completed enrollment...
August 25, 2016: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/27322915/the-myosin-activator-omecamtiv-mecarbil-a-promising-new-inotropic-agent
#14
Péter Nánási, Krisztina Váczi, Zoltán Papp
Heart failure became a leading cause of mortality in the past few decades with a progressively increasing prevalence. Its current therapy is restricted largely to the suppression of the sympathetic activity and the renin-angiotensin system in combination with diuretics. This restrictive strategy is due to the potential long-term adverse effects of inotropic agents despite their effective influence on cardiac function when employed for short durations. Positive inotropes include inhibitors of the Na(+)/K(+) pump, β-receptor agonists, and phosphodiesterase inhibitors...
October 2016: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/27199119/a-myosin-activator-improves-actin-assembly-and-sarcomere-function-of-human-induced-pluripotent-stem-cell-derived-cardiomyocytes-with-a-troponin-t-point-mutation
#15
K M Broughton, J Li, E Sarmah, C M Warren, Y-H Lin, M P Henze, V Sanchez-Freire, R J Solaro, B Russell
We have investigated cardiac myocytes derived from human-induced pluripotent stem cells (iPSC-CMs) from two normal control and two family members expressing a mutant cardiac troponin T (cTnT-R173W) linked to dilated cardiomyopathy (DCM). cTnT is a regulatory protein of the sarcomeric thin filament. The loss of this basic charge, which is strategically located to control tension, has consequences leading to progressive DCM. iPSC-CMs serve as a valuable platform for understanding clinically relevant mutations in sarcomeric proteins; however, there are important questions to be addressed with regard to myocyte adaptation that we model here by plating iPSC-CMs on softer substrates (100 kPa) to create a more physiologic environment during recovery and maturation of iPSC-CMs after thawing from cryopreservation...
July 1, 2016: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/27104862/potential-new-drug-treatments-for-congestive-heart-failure
#16
REVIEW
Hao A Tran, Felice Lin, Barry H Greenberg
INTRODUCTION: The prevalence of heart failure (HF) has increased globally in recent decades. Advances in our understanding of underlying pathophysiologic mechanisms have given rise to new therapies for treating the growing HF population. Nonetheless, morbidity and mortality associated with HF and its financial implications are daunting. Thus, novel therapies that can improve the natural history of HF patients are urgently needed. AREAS COVERED: This article reviews new investigational drugs being developed for the treatment of both acute decompensated heart failure (ADHF) and chronic heart failure with reduced ejection fraction (HFrEF)...
July 2016: Expert Opinion on Investigational Drugs
https://www.readbyqxmd.com/read/27012405/acute-treatment-with-omecamtiv-mecarbil-to-increase-contractility-in-acute-heart-failure-the-atomic-ahf-study
#17
RANDOMIZED CONTROLLED TRIAL
John R Teerlink, G Michael Felker, John J V McMurray, Piotr Ponikowski, Marco Metra, Gerasimos S Filippatos, Justin A Ezekowitz, Kenneth Dickstein, John G F Cleland, Jae B Kim, Lei Lei, Beat Knusel, Andrew A Wolff, Fady I Malik, Scott M Wasserman
BACKGROUND: Omecamtiv mecarbil (OM) is a selective cardiac myosin activator that increases myocardial function in healthy volunteers and in patients with chronic heart failure. OBJECTIVES: This study evaluated the pharmacokinetics, pharmacodynamics, tolerability, safety, and efficacy of OM in patients with acute heart failure (AHF). METHODS: Patients admitted for AHF with left ventricular ejection fraction ≤40%, dyspnea, and elevated plasma concentrations of natriuretic peptides were randomized to receive a double-blind, 48-h intravenous infusion of placebo or OM in 3 sequential, escalating-dose cohorts...
March 29, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/26709596/relative-bioavailability-food-effect-and-safety-of-the-single-dose-pharmacokinetics-of-omecamtiv-mecarbil-following-administration-of-different-modified-release-formulations-in-healthy-subjects
#18
RANDOMIZED CONTROLLED TRIAL
Rameshraja Palaparthy, Christopher Banfield, Paco Alvarez, Lucy Yan, Brian Smith, Jessica Johnson, Maria Laura Monsalvo, Fady Malik
OBJECTIVE: Omecamtiv mecarbil is a novel small molecule that directly activates cardiac myosin and increases cardiac contractility without increasing cardiac myocyte intracellular calcium. This study evaluated the relative bioavailability, food effect, and safety of several modified-release (MR) formulations of omecamtiv mecarbil. METHODS: This was a phase 1, randomized, open-label, 4-way crossover, incomplete block-design study evaluating 5 MR formulations of omecamtiv mecarbil vs...
March 2016: International Journal of Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/26708829/manufacturing-of-14-c-labeled-drug-substance-and-drug-product-utilized-in-clinical-research-a-case-study-of-omecamtiv-mecarbil
#19
REVIEW
Scott W Roberts, Jeroen M Bezemer, Michael T Kennedy, Tiffany L Correll, Raju Subramanian, Shawn D Walker
This mini-review describes the Chemistry, Manufacturing and Control activities associated with the manufacture of [(14)C]-labeled drug substance and subsequent drug compounding activities to generate clinical trial material utilized in human absorption, distribution, metabolism, and excretion clinical studies. Due to the unstable nature and increased decomposition rates observed with [(14)C]-labeled compounds, the manufacture, testing, release, formulation, and regulatory filings are uniquely challenging. A case study of the cardiac myosin activator AMG 423 (omecamtiv mercarbil), utilized in a dual oral/intravenous infusion clinical study is presented...
2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/26690127/use-of-inotropic-agents-in-treatment-of-systolic-heart-failure
#20
REVIEW
Sohaib Tariq, Wilbert S Aronow
The most common use of inotropes is among hospitalized patients with acute decompensated heart failure, with reduced left ventricular ejection fraction and with signs of end-organ dysfunction in the setting of a low cardiac output. Inotropes can be used in patients with severe systolic heart failure awaiting heart transplant to maintain hemodynamic stability or as a bridge to decision. In cases where patients are unable to be weaned off inotropes, these agents can be used until a definite or escalated supportive therapy is planned, which can include coronary revascularization or mechanical circulatory support (intra-aortic balloon pump, extracorporeal membrane oxygenation, impella, left ventricular assist device, etc...
December 4, 2015: International Journal of Molecular Sciences
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