April 1, 1994Circulation Research
Alpha-skeletal actin is associated with increased contractility in the mouse heart.
Why the study?
Does overexpression of alpha-skeletal actin increase cardiac contractility in a murine model?
Population
BALB/c mice (n=15) using the isolated perfused work-performing murine heart model
Design
Preclinical
Authors
Discussion
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Member takes
Implication
Hypothesis-generating in mice; leaves open whether alpha-skeletal actin overexpression causally enhances contractility or translates clinically.
Key Points
- This study aims to evaluate how overexpression of alpha-skeletal actin influences cardiac contractile function in mice.
- Used the isolated perfused work-performing murine heart model to assess cardiac function.
- Measured maximum rate of contraction (+dP/dt) and relaxation (-dP/dt) of left intraventricular pressure.
- Quantified actin isoform expression using dot blots of total RNA.
- Increased levels of alpha-skeletal actin mRNA correlated with improved contractility (r = 0.80, n = 15, P < 0.001).
- Alpha-skeletal actin was associated with a significant increase in maximum contraction rates compared to alpha-cardiac actin.
- The findings suggest that alpha-skeletal actin contributes to enhanced cardiac contractile function.
Structured PICO
Does overexpression of alpha-skeletal actin increase cardiac contractility in a murine model?
P
Population
BALB/c mice (n=15) using the isolated perfused work-performing murine heart model
I
Intervention
Overexpression of alpha-skeletal actin isoform
O
Outcome
Myocardial contractility (maximum rate of contraction [+dP/dt], time to peak pressure, relaxation [-dP/dt], and time to half relaxation of left intraventricular pressure)surrogate
In a murine model, increased expression of alpha-skeletal actin is significantly correlated with enhanced cardiac contractile function.
Cite This Study
Hewett et al. (1994) studied this question.