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Cond Med. 2019;2(4):142-151.

INDUCED PLURIPOTENT STEM CELLS FOR MODELLING ENERGETIC ALTERATIONS IN HYPERTROPHIC CARDIOMYOPATHY.

Conditioning medicine

Chrishan J A Ramachandra, K P Myu Mai Ja, Ying-Hsi Lin, Winston Shim, William A Boisvert, Derek J Hausenloy

Affiliations

  1. National Heart Research Institute Singapore, National Heart Centre Singapore, Singapore.
  2. Cardiovascular & Metabolic Disorders Program, Duke-National University of Singapore Medical School, Singapore.
  3. Health and Social Sciences Cluster, Singapore Institute of Technology, Singapore.
  4. Center for Cardiovascular Research, John A. Burns School of Medicine, University of Hawaii, USA.
  5. Yong Loo Lin School of Medicine, National University Singapore, Singapore.
  6. The Hatter Cardiovascular Institute, University College London, London, UK.
  7. The National Institute of Health Research University College London Hospitals Biomedical Research Centre, Research & Development, London, UK.
  8. Tecnologico de Monterrey, Centro de Biotecnologia-FEMSA, Nuevo Leon, Mexico.

PMID: 32457935 PMCID: PMC7250397

Abstract

Hypertrophic cardiomyopathy (HCM) is one of the most commonly inherited cardiac disorders that manifests with increased ventricular wall thickening, cardiomyocyte hypertrophy, disarrayed myofibers and interstitial fibrosis. The major pathophysiological features include, diastolic dysfunction, obstruction of the left ventricular outflow tract and cardiac arrhythmias. Mutations in genes that encode mostly for sarcomeric proteins have been associated with HCM but, despite the abundant research conducted to decipher the molecular mechanisms underlying the disease, it remains unclear as to how a primary defect in the sarcomere could lead to secondary phenotypes such as cellular hypertrophy. Mounting evidence suggests energy deficiency could be an important contributor of disease pathogenesis as well. Various animal models of HCM have been generated for gaining deeper insight into disease pathogenesis, however species variation between animals and humans, as well as the limited availability of human myocardial samples, has encouraged researchers to seek alternative 'humanized' models. Using induced pluripotent stem cells (iPSCs), human cardiomyocytes (CMs) have been generated from patients with HCM for investigating disease mechanisms. While these HCM-iPSC models demonstrate most of the phenotypic traits, it is important to ascertain if they recapitulate all pathophysiological features, especially that of energy deficiency. In this review we discuss the currently established HCM-iPSC models with emphasis on altered energetics.

Keywords: Hypertrophic cardiomyopathy (HCM); cardiomyocytes; disease modelling; energetics; induced pluripotent stem cells (iPSCs); metabolism

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