Key result
Adenoviral gene delivery of KCNE3 in guinea pigs significantly reduced the corrected QT interval from 158 ms to 143 ms.
Why the study?
Does ectopic expression of KCNE3 abbreviate action potential duration and QT interval in cardiac myocytes?
Population
Chinese hamster ovary cells, isolated rabbit left ventricular myocytes, and female guinea pigs
Comparison
Adenovirus-mediated ectopic expression of KCNE3… vs Control cells/animals
Design
Preclinical
Follow-up
72 hours (in vivo)
Authors
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Suggests KCNE3 gene therapy potential for long QT syndrome; leaves open translation from guinea pig models to patients.
Does ectopic expression of KCNE3 abbreviate action potential duration and QT interval in cardiac myocytes?
Absolute Event Rate: 143% vs 158%
p-value: p=<0.05
Ectopic expression of KCNE3 accelerates cardiac repolarization and shortens the QT interval, suggesting a potential gene therapy approach for long QT syndrome if homogeneous expression can be achieved.
Mazhari et al. (2002) studied Long QT syndrome (preclinical model) (n=8). Adenovirus-expressed KCNE3 (AdCGI-KCNE3) vs. Baseline was evaluated on Corrected QT interval (QTc) in milliseconds (p=<0.05). Adenoviral gene delivery of KCNE3 in guinea pigs significantly reduced the corrected QT interval from 158 ms to 143 ms.
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