Key result
Cardiomyocyte CXCR4 knockout triggers progressive cardiac dysfunction with a ~2.5-fold decline in EF.
Why the study?
To determine the structural and functional consequences of CXCR4 myocardial knockout in the absence of exogenous stress.
Does cardiomyocyte-specific CXCR4 knockout lead to progressive cardiomyopathy and heart failure in mice?
Population
Cardiomyocyte specific-CXCR4 knockout mice and wild-type littermate controls
Comparison
Cardiomyocyte specific-CXCR4 knockout vs wild-type littermates
Design
Preclinical animal study
Follow-up
12-months of age
Authors
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Should not yet change practice; supports essential adult role for cardiomyocyte CXCR4 and leaves open therapeutic targeting in human HF.
Does cardiomyocyte-specific CXCR4 knockout lead to progressive cardiomyopathy and heart failure in mice?
Effect estimate: ≥2.5-fold decline
p-value: p=<0.01
Cardiomyocyte-specific deletion of CXCR4 in mice leads to progressive cardiomyopathy and clinical heart failure by 12 months of age, demonstrating that CXCR4 plays a critical, non-developmental role in regulating baseline cardiac function and β-adrenergic responses.
LaRocca et al. (2019) studied Cardiomyopathy. Cardiac specific CXCR4 knockout vs. Wild-type littermate controls was evaluated on Ejection fraction at 12 months (≥2.5-fold decline, p=<0.01). Cardiomyocyte-specific CXCR4 knockout in mice led to progressive cardiac dysfunction, characterized by a 50% increase in heart weight to body weight ratio and a ≥2.5-fold decline in ejection fraction by 12 months of age.
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