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Left ventricular function and beta-adrenoceptors in rabbit failing heart
N Gilson1, N el Houda Bouanani, A Corsin
1Institut National de la Santé et de la Recherche Médicale U. 2, Hôpital Léon Bernard, Limeil-Brevannes, France.
The American Journal of Physiology
|March 1, 1990
Summary
A new rabbit model of heart failure (HF) shows significant left ventricular (LV) dysfunction and decreased beta-adrenergic receptor density. This model aids in studying HF pathophysiology and potential drug therapies.
Area of Science:
- Cardiovascular Physiology
- Pharmacology
- Animal Models of Disease
Background:
- Limited availability of reliable heart failure (HF) models for research.
- Need for models that mimic human HF pathophysiology for drug development.
Purpose of the Study:
- To develop and characterize a novel rabbit model of chronic heart failure (HF).
- To investigate left ventricular (LV) function and beta-adrenergic receptor (β-AR) status in this HF model.
Main Methods:
- Induction of pressure plus volume overload in rabbits to create a chronic HF model.
- In vivo assessment of LV function using pressure catheters and ultrasonic crystals.
- Quantification of β-AR density on cardiac membranes using radioligand binding assays ([3H]CGP 12177).
Main Results:
- HF rabbits exhibited significant increases in LV weight and end-diastolic diameter.
- Marked reduction in LV systolic shortening and impaired chronotropic response to isoproterenol in HF rabbits.
- HF rabbits showed decreased ventricular β-AR density without changes in receptor affinity.
Conclusions:
- The developed rabbit model demonstrates chronic HF with cardiac hypertrophy, dilation, and impaired LV function.
- This model is associated with reduced cardiac responsiveness to catecholamines and lower β-AR density.
- This HF model provides a valuable tool for physiological and pharmacological studies.