Engineered bacterial voltage-gated sodium channels delivered via AAV significantly enhanced excitability and conduction in cardiomyocytes and reduced reentrant arrhythmias in fibrotic cardiac cultures.
Does engineered bacterial voltage-gated sodium channel (BacNav) gene therapy enhance electrical excitability and reduce arrhythmias in cardiac models?
Engineered prokaryotic sodium channels delivered via AAV can stably enhance cardiac excitability and conduction without adverse effects, offering a potential gene therapy platform for cardiac conduction disorders.
Abstract Therapies for cardiac arrhythmias could greatly benefit from approaches to enhance electrical excitability and action potential conduction in the heart by stably overexpressing mammalian voltage-gated sodium channels. However, the large size of these channels precludes their incorporation into therapeutic viral vectors. Here, we report a platform utilizing small-size, codon-optimized engineered prokaryotic sodium channels (BacNa v ) driven by muscle-specific promoters that significantly enhance excitability and conduction in rat and human cardiomyocytes in vitro and adult cardiac tissues from multiple species in silico. We also show that the expression of BacNa v significantly reduces occurrence of conduction block and reentrant arrhythmias in fibrotic cardiac cultures. Moreover, functional BacNa v channels are stably expressed in healthy mouse hearts six weeks following intravenous injection of self-complementary adeno-associated virus (scAAV) without causing any adverse effects on cardiac electrophysiology. The large diversity of prokaryotic sodium channels and experimental-computational platform reported in this study should facilitate the development and evaluation of BacNa v -based gene therapies for cardiac conduction disorders.
Nguyen et al. (Wed,) conducted a other in Cardiac arrhythmias (preclinical models). BacNav (h2SheP) gene therapy via scAAV9 vs. GFP control or non-transduced was evaluated on Conduction velocity and incidence of reentrant arrhythmias. Engineered bacterial voltage-gated sodium channels delivered via AAV significantly enhanced excitability and conduction in cardiomyocytes and reduced reentrant arrhythmias in fibrotic cardiac cultures.