A Small Molecule Inhibitor of Sarcomere Contractility Acutely Relieves Left Ventricular Outflow Tract Obstruction in Feline Hypertrophic Cardiomyopathy
Publication Date
December 14, 2016
Authors
Joshua A. Stern, Svetlana Markova, Yu Ueda, Jae B. Kim, et al
Volume
11
Issue
12
Pages
e0168407
DOI
https://dx.plos.org/10.1371/journal.pone.0168407
Publisher URL
http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0168407
Scopus
85006149781
Mendeley
http://www.mendeley.com/research/small-molecule-inhibitor-sarcomere-contractility-acutely-relieves-left-ventricular-outflow-tract-obs
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Mendeley | Further Information

{"title"=>"A small molecule inhibitor of sarcomere contractility acutely relieves left ventricular outflow tract obstruction in feline hypertrophic cardiomyopathy", "type"=>"journal", "authors"=>[{"first_name"=>"Joshua A.", "last_name"=>"Stern", "scopus_author_id"=>"23091969700"}, {"first_name"=>"Svetlana", "last_name"=>"Markova", "scopus_author_id"=>"57192393855"}, {"first_name"=>"Yu", "last_name"=>"Ueda", "scopus_author_id"=>"56645532500"}, {"first_name"=>"Jae B.", "last_name"=>"Kim", "scopus_author_id"=>"57192392085"}, {"first_name"=>"Peter J.", "last_name"=>"Pascoe", "scopus_author_id"=>"7005213541"}, {"first_name"=>"Marc J.", "last_name"=>"Evanchik", "scopus_author_id"=>"24775551000"}, {"first_name"=>"Eric M.", "last_name"=>"Green", "scopus_author_id"=>"57102665500"}, {"first_name"=>"Samantha P.", "last_name"=>"Harris", "scopus_author_id"=>"7403484501"}], "year"=>2016, "source"=>"PLoS ONE", "identifiers"=>{"doi"=>"10.1371/journal.pone.0168407", "sgr"=>"85006149781", "isbn"=>"1932-6203 (Electronic) 1932-6203 (Linking)", "scopus"=>"2-s2.0-85006149781", "pui"=>"613668910", "issn"=>"19326203", "pmid"=>"27973580"}, "id"=>"e363eaee-5f5f-3722-911b-5de1f8712845", "abstract"=>"Hypertrophic cardiomyopathy (HCM) is an inherited disease of the heart muscle characterized by otherwise unexplained thickening of the left ventricle. Left ventricular outflow tract (LVOT) obstruction is present in approximately two-thirds of patients and substantially increases the risk of disease complications. Invasive treatment with septal myectomy or alcohol septal ablation can improve symptoms and functional status, but currently available drugs for reducing obstruction have pleiotropic effects and variable therapeutic responses. New medical treatments with more targeted pharmacology are needed, but the lack of preclinical animal models for HCM with LVOT obstruction has limited their development. HCM is a common cause of heart failure in cats, and a subset exhibit systolic anterior motion of the mitral valve leading to LVOT obstruction. MYK-461 is a recently-described, mechanistically novel small molecule that acts at the sarcomere to specifically inhibit contractility that has been proposed as a treatment for HCM. Here, we use MYK-461 to test whether direct reduction in contractility is sufficient to relieve LVOT obstruction in feline HCM. We evaluated mixed-breed cats in a research colony derived from a Maine Coon/mixed-breed founder with naturally-occurring HCM. By echocardiography, we identified five cats that developed systolic anterior motion of the mitral valve and LVOT obstruction both at rest and under anesthesia when provoked with an adrenergic agonist. An IV MYK-461 infusion and echocardiography protocol was developed to serially assess contractility and LVOT gradient at multiple MYK-461 concentrations. Treatment with MYK-461 reduced contractility, eliminated systolic anterior motion of the mitral valve and relieved LVOT pressure gradients in an exposure-dependent manner. Our findings provide proof of principle that acute reduction in contractility with MYK-461 is sufficient to relieve LVOT obstruction. Further, these studies suggest that feline HCM will be a valuable translational model for the study of disease pathology, particularly LVOT obstruction.", "link"=>"http://www.mendeley.com/research/small-molecule-inhibitor-sarcomere-contractility-acutely-relieves-left-ventricular-outflow-tract-obs", "reader_count"=>38, "reader_count_by_academic_status"=>{"Unspecified"=>5, "Professor > Associate Professor"=>1, "Researcher"=>5, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>6, "Student > Postgraduate"=>4, "Student > Master"=>4, "Other"=>4, "Student > Bachelor"=>5, "Lecturer"=>1, "Professor"=>2}, "reader_count_by_user_role"=>{"Unspecified"=>5, "Professor > Associate Professor"=>1, "Researcher"=>5, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>6, "Student > Postgraduate"=>4, "Student > Master"=>4, "Other"=>4, "Student > Bachelor"=>5, "Lecturer"=>1, "Professor"=>2}, "reader_count_by_subject_area"=>{"Unspecified"=>7, "Engineering"=>1, "Biochemistry, Genetics and Molecular Biology"=>3, "Nursing and Health Professions"=>1, "Agricultural and Biological Sciences"=>6, "Medicine and Dentistry"=>8, "Business, Management and Accounting"=>1, "Veterinary Science and Veterinary Medicine"=>8, "Chemistry"=>1, "Psychology"=>1, "Social Sciences"=>1}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>1}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>8}, "Chemistry"=>{"Chemistry"=>1}, "Social Sciences"=>{"Social Sciences"=>1}, "Psychology"=>{"Psychology"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>6}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>1}, "Business, Management and Accounting"=>{"Business, Management and Accounting"=>1}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>3}, "Unspecified"=>{"Unspecified"=>7}, "Veterinary Science and Veterinary Medicine"=>{"Veterinary Science and Veterinary Medicine"=>8}}, "group_count"=>4}

Scopus | Further Information

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