March 3, 2003Circulation
Expression and Function of a Biological Pacemaker in Canine Heart
Why the study?
Does localized overexpression of HCN2 in the canine left atrium create a functional biological pacemaker?
Population
Canine models (dogs), n=7
Comparison
Adenoviral constructs of mouse HCN2 and green… vs Adenoviral constructs of GFP alone injected into…
Design
Preclinical
Follow-up
3 to 4 days
Authors
Discussion
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Implication
Supports HCN2 overexpression as biological pacemaker in canine LA; hypothesis-generating for human gene therapy in bradyarrhythmias.
Key Points
- This study aims to evaluate the effectiveness of HCN2 overexpression as a biological pacemaker in canine hearts.
- Adenoviral constructs of mouse HCN2 and GFP were injected into the left atrium of dogs.
- Terminal studies were conducted 3 to 4 days post-injection to assess pacemaker current.
- Rhythmic responses and myocyte examination were performed to compare expression outcomes.
- Spontaneous left atrial rhythms were observed in all 4 HCN2+GFP dogs compared to 0 of 3 GFP-only dogs (P<0.05).
- The expressed pacemaker current (I(HCN2)) in HCN2+GFP LA was significantly higher at 3823+/-713 pA at -125 mV.
- Native I(f) in non-expressed myocytes was low at 7+/-4 pA at -130 mV.
Structured PICO
Does localized overexpression of HCN2 in the canine left atrium create a functional biological pacemaker?
P
Population
Canine models (dogs), n=7
I
Intervention
Adenoviral constructs of mouse HCN2 and green fluorescent protein (GFP) injected into the left atrium
C
Comparator
Adenoviral constructs of GFP alone injected into the left atrium
O
Outcome
Spontaneous left atrial rhythms after vagal stimulation-induced sinus arrest and expressed pacemaker current (I(f))surrogate
Localized overexpression of HCN2 in the canine left atrium functions as a biological pacemaker, offering a potential gene therapy approach for pacemaker disease.
Cite This Study
Qu et al. (2003) studied this question.