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Rodent Working Heart Model for the Study of Myocardial Performance and Oxygen Consumption

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Functional beta3-adrenoceptor in the human heart

C Gauthier¹, G Tavernier, F Charpentier

¹Laboratoire de Physiopathologie et Pharmacologie Cellulaires et Moléculaires, CHU de Nantes, France.

The Journal of Clinical Investigation

|July 15, 1996

Summary

The human heart contains functional beta3-adrenoceptors, which cause negative inotropic effects and may contribute to heart failure. These findings reveal a new role for beta3-adrenoceptors in cardiac function.

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Area of Science:

Cardiology
Pharmacology
Molecular Biology

Background:

Beta3-adrenoceptors are known for roles in metabolism and vasodilation.
Their presence and function in the human heart remain undocumented.
Understanding cardiac beta-adrenoceptor subtypes is crucial for cardiovascular research.

Purpose of the Study:

To investigate the existence and functional role of beta3-adrenoceptors in the human heart.
To determine the effects of beta3-adrenoceptor agonists on human ventricular contractility and action potentials.
To explore the potential involvement of beta3-adrenoceptors in cardiac pathophysiology.

Main Methods:

Utilized beta-adrenoceptor agonists and antagonists on human ventricular endomyocardial biopsies.
Assessed mechanical properties and action potential characteristics.
Employed polymerase chain reaction to detect beta3-adrenoceptor transcripts.

Main Results:

Beta3-adrenoceptor agonists induced negative inotropic effects, reducing myocardial contractility.
The potency order for agonists was BRL 37344 > SR 58611 ≈ CL 316243 > CGP 12177.
Agonists also reduced action potential amplitude and accelerated repolarization; beta3-adrenoceptor transcripts were detected.

Conclusions:

Beta3-adrenoceptors are present and functional in the human heart.
These receptors mediate negative inotropic effects, explaining unexpected catecholamine actions.
Beta3-adrenoceptors may play a role in the pathophysiology of heart failure.