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Effects of growth hormone and insulin-like growth factor I in experimental heart failure
1Department of Medicine, University of California at San Diego, La Jolla 92093-0613, USA.
Insights
Growth hormone (GH) and insulin-like growth factor I (IGF-I) show beneficial effects on heart failure, improving cardiac function. Further research is needed to fully understand mechanisms, long-term impacts, and potential side effects.
Area of Science:
- Cardiology
- Endocrinology
- Physiology
Background:
- Heart failure is characterized by severely depressed cardiac function.
- Growth hormone (GH) and insulin-like growth factor I (IGF-I) are investigated for their potential therapeutic roles.
Purpose of the Study:
- To evaluate the favorable effects of GH and IGF-I on the failing heart.
- To explore the mechanisms underlying GH's inotropic and trophic effects.
- To investigate GH's vascular actions and potential impact on skeletal muscle.
Main Methods:
- Review of existing studies on GH and IGF-I in heart failure models.
- Analysis of cardiac contractility, hypertrophy, and vascular responses.
- Consideration of interactions with ACE inhibitors and angiotensin II receptor blockers.
Main Results:
- GH and IGF-I demonstrate generally favorable effects on the failing heart.
- The heart shows responsiveness to the trophic and inotropic effects of GH.
- Potential for GH to enhance skeletal muscle mass and strength observed.
Conclusions:
- GH and IGF-I hold promise for treating heart failure.
- Further research is required to elucidate mechanisms, hypertrophy characterization, vascular actions, and long-term clinical outcomes.
- Investigating interactions with cardiovascular medications and potential side effects is crucial.
Abstract:
These studies suggest that IGF-I and GH have generally favourable effects on the failing heart. They further demonstrate the ability of the severely depressed and failing heart to respond to the trophic and inotropic effects of GH. There is, however, a need for a better understanding of the mechanism of the contractility effect, the character of the hypertrophy observed (whether it is a more favourable type than that secondary to mechanical overload) and the vascular actions, both trophic and vasodilatory. In addition, the degree to which high-dose ACE inhibition or angiotensin II receptor blockade may inhibit some of these effects requires further study. Finally, it is clear that additional experimental studies and clinical trials are needed to investigate the long-term effects of GH on morbidity and mortality in heart failure, as well as the possible side-effects and other actions, such as the potential of GH to enhance skeletal muscle size and strength.