Why the study?
Does gender influence left ventricular functional and molecular adaptation to pressure overload in rats?
Population
Male and female Wistar rats undergoing ascending aortic stenosis, and gender-matched control rats
Comparison
Ascending aortic stenosis (pressure overload) vs Gender-matched control rats without ascending…
Design
Preclinical
Follow-up
6 weeks after banding
Key result
Male rats with pressure overload hypertrophy demonstrated depressed contractile reserve and altered gene expression compared to female rats, which preserved contractile reserve despite similar hypertrophy.
Authors
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Sex differences in rat hypertrophic contractile reserve warrant no clinical change; leaves open estrogen-linked mechanisms for human studies.
Does gender influence left ventricular functional and molecular adaptation to pressure overload in rats?
There are significant gender differences in left ventricular adaptation and gene expression in response to pressure overload in rats, which may be related to estrogen signaling.
Weinberg et al. (1999) studied Left ventricular pressure overload hypertrophy (n=30). Ascending aortic stenosis (pressure overload) vs. Gender-matched control rats was evaluated on Left ventricular contractile reserve and cardiac gene expression. Male rats with pressure overload hypertrophy demonstrated depressed contractile reserve and altered gene expression compared to female rats, which preserved contractile reserve despite similar hypertrophy.