Gene transfer of a synthetic pacemaker channel into the heart: A novel strategy for biological pacing

Yuji Kashiwakura, Hee Cheol Cho, Andreas S. Barth, Ezana Azene, Eduardo Marbán

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND - One key element of natural pacemakers is the pacemaker current encoded by the hyperpolarization-activated nucleotide-gated channel (HCN) gene family. Although HCN gene transfer has been used to engineer biological pacemakers, this strategy may be confounded by unpredictable consequences of heteromultimerization with endogenous HCN family members and limited flexibility with regard to frequency tuning of the engineered pacemaker. METHODS AND RESULTS - To circumvent these limitations, we converted a depolarization- activated potassium-selective channel, Kv1.4, into a hyperpolarization-activated nonselective channel by site-directed mutagenesis (R447N, L448A, and R453I in S4 and G528S in the pore). Gene transfer into ventricular myocardium demonstrated the ability of this construct to induce pacemaker activity with spontaneous action potential oscillations in adult ventricular myocytes and idioventricular rhythms by in vivo electrocardiography. CONCLUSIONS - Given the sparse expression of Kv1 family channels in the human ventricle, gene transfer of a synthetic pacemaker channel based on the Kv1 family has novel therapeutic potential as a biological alternative to electronic pacemakers.

Original languageEnglish (US)
Pages (from-to)1682-1686
Number of pages5
JournalCirculation
Volume114
Issue number16
DOIs
StatePublished - Oct 2006

Keywords

  • Gene therapy
  • Ion channels
  • Pacing

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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