Substrate mechanics unveil early structural and functional pathology in iPSC micro-tissue models of hypertrophic cardiomyopathy

Jingxuan Guo, Huanzhu Jiang, David Schuftan, Jonathan D. Moreno, Ghiska Ramahdita, Lavanya Aryan, Druv Bhagavan, Jonathan Silva, Nathaniel Huebsch

Research output: Contribution to journalArticlepeer-review

Abstract

Hypertension is a major cause of morbidity and mortality in patients with hypertrophic cardiomyopathy (HCM), suggesting a potential role for mechanics in HCM pathogenesis. Here, we developed an in vitro physiological model to investigate how mechanics acts together with HCM-linked myosin binding protein C (MYBPC3) mutations to trigger disease. Micro-heart muscles (μHM) were engineered from induced pluripotent stem cell (iPSC)-derived cardiomyocytes bearing MYBPC3+/− mutations and challenged to contract against substrates of different elasticity. μHMs that worked against substrates with stiffness at or exceeding the stiffness of healthy adult heart muscle exhibited several hallmarks of HCM, including cellular hypertrophy, impaired contractile energetics, and maladaptive calcium handling. Remarkably, we discovered changes in troponin C and T localization in MYBPC3+/− μHM that were entirely absent in 2D culture. Pharmacologic studies suggested that excessive Ca2+ intake through membrane-embedded channels underlie the observed electrophysiological abnormalities. These results illustrate the power of physiologically relevant engineered tissue models to study inherited disease with iPSC technology.

Original languageEnglish
Article number109954
JournaliScience
Volume27
Issue number6
DOIs
StatePublished - Jun 21 2024

Keywords

  • Biological sciences
  • Mechanobiology
  • Stem cells research
  • Tissue engineering

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