[HTML][HTML] Dual gene therapy with SERCA1 and Kir2. 1 abbreviates excitation without suppressing contractility

IL Ennis, RA Li, AM Murphy, E Marbán… - The Journal of clinical …, 2002 - Am Soc Clin Investig
The Journal of clinical investigation, 2002Am Soc Clin Investig
Heart failure is characterized by depressed contractility and delayed repolarization. The
latter feature predisposes the failing heart to ventricular arrhythmias and represents a logical
target for gene therapy. Unfortunately, unopposed correction of the delay in repolarization
will decrease the time available for calcium cycling during each heartbeat, potentially
aggravating the depression of contractility. Here we describe the development and
application of a novel gene therapy strategy designed to abbreviate excitation without …
Heart failure is characterized by depressed contractility and delayed repolarization. The latter feature predisposes the failing heart to ventricular arrhythmias and represents a logical target for gene therapy. Unfortunately, unopposed correction of the delay in repolarization will decrease the time available for calcium cycling during each heartbeat, potentially aggravating the depression of contractility. Here we describe the development and application of a novel gene therapy strategy designed to abbreviate excitation without depressing contraction. The calcium ATPase SERCA1 was coexpressed with the potassium channel Kir2.1 in guinea pig hearts. Myocytes from the hearts had bigger calcium transients and shorter action potentials. In vivo, repolarization was abbreviated, but contractile function remained unimpaired. Dual gene therapy of the sort described here can be generalized to exploit opposing or synergistic therapeutic principles to achieve a tailored phenotype.
The Journal of Clinical Investigation