2. Academic Validation
  3. A small-molecule inhibitor of sarcomere contractility suppresses hypertrophic cardiomyopathy in mice

A small-molecule inhibitor of sarcomere contractility suppresses hypertrophic cardiomyopathy in mice

  • Science. 2016 Feb 5;351(6273):617-21. doi: 10.1126/science.aad3456.
Eric M Green 1,  Hiroko Wakimoto 2,  Robert L Anderson 1,  Marc J Evanchik 1,  Joshua M Gorham 2,  Brooke C Harrison 3,  Marcus Henze 1,  Raja Kawas 1,  Johan D Oslob 1,  Hector M Rodriguez 1,  Yonghong Song 1,  William Wan 3,  Leslie A Leinwand 3,  James A Spudich 4,  Robert S McDowell 5,  J G Seidman 2,  Christine E Seidman 6
Affiliations

Affiliations

  • 1 MyoKardia, South San Francisco, CA 94080, USA.
  • 2 Department of Genetics, Harvard Medical School, Boston, MA 02115, USA.
  • 3 Department of Molecular, Cellular, and Developmental Biology and BioFrontiers Institute, University of Colorado, Boulder, CO 80309, USA.
  • 4 Department of Biochemistry, Stanford University School of Medicine, Stanford, CA 94305, USA.
  • 5 MyoKardia, South San Francisco, CA 94080, USA. cseidman@genetics.harvard.edu rmcdowell@myokardia.com.
  • 6 Department of Genetics, Harvard Medical School, Boston, MA 02115, USA. Division of Cardiovascular Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA. Howard Hughes Medical Institute, Chevy Chase, MD 20815, USA. cseidman@genetics.harvard.edu rmcdowell@myokardia.com.
PMID: 26912705 DOI: 10.1126/science.aad3456
Abstract

Hypertrophic cardiomyopathy (HCM) is an inherited disease of heart muscle that can be caused by mutations in sarcomere proteins. Clinical diagnosis depends on an abnormal thickening of the heart, but the earliest signs of disease are hyperdynamic contraction and impaired relaxation. Whereas some in vitro studies of power generation by mutant and wild-type sarcomere proteins are consistent with mutant sarcomeres exhibiting enhanced contractile power, Others are not. We identified a small molecule, MYK-461, that reduces contractility by decreasing the adenosine triphosphatase activity of the cardiac Myosin heavy chain. Here we demonstrate that early, chronic administration of MYK-461 suppresses the development of ventricular hypertrophy, cardiomyocyte disarray, and myocardial fibrosis and attenuates hypertrophic and profibrotic gene expression in mice harboring heterozygous human mutations in the Myosin heavy chain. These data indicate that hyperdynamic contraction is essential for HCM pathobiology and that inhibitors of sarcomere contraction may be a valuable therapeutic approach for HCM.

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