3.8 Article

iPS Cell-Derived Cardiogenicity is Hindered by Sustained Integration of Reprogramming Transgenes

Journal

CIRCULATION-CARDIOVASCULAR GENETICS
Volume 7, Issue 5, Pages 667-676

Publisher

LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCGENETICS.113.000298

Keywords

induced pluripotent stem cells; nuclear reprogramming; regeneration; regenerative medicine; stem cells

Funding

  1. National Institutes of Health
  2. American Heart Association
  3. Fondation Leducq (Paris, France)
  4. Marriott Heart Disease Research Program
  5. Todd and Karen Wanek Family Program for Hypoplastic Left Heart Syndrome
  6. Mayo Clinic Center for Regenerative Medicine

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Background Nuclear reprogramming inculcates pluripotent capacity by which de novo tissue differentiation is enabled. Yet, introduction of ectopic reprogramming factors may desynchronize natural developmental schedules. This study aims to evaluate the effect of imposed transgene load on the cardiogenic competency of induced pluripotent stem (iPS) cells. Methods and Results Targeted inclusion and exclusion of reprogramming transgenes (c-MYC, KLF4, OCT4, and SOX2) was achieved using a drug-inducible and removable cassette according to the piggyBac transposon/transposase system. Pulsed transgene overexpression, before iPS cell differentiation, hindered cardiogenic outcomes. Delayed in counterparts with maintained integrated transgenes, transgene removal enabled proficient differentiation of iPS cells into functional cardiac tissue. Transgene-free iPS cells generated reproducible beating activity with robust expression of cardiac -actinin, connexin 43, myosin light chain 2a, /-myosin heavy chain, and troponin I. Although operational excitation-contraction coupling was demonstrable in the presence or absence of transgenes, factor-free derivatives exhibited an expedited maturing phenotype with canonical responsiveness to adrenergic stimulation. Conclusions A disproportionate stemness load, caused by integrated transgenes, affects the cardiogenic competency of iPS cells. Offload of transgenes in engineered iPS cells ensures integrity of cardiac developmental programs, underscoring the value of nonintegrative nuclear reprogramming for derivation of competent cardiogenic regenerative biologics.

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