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Cardiovascular actions of insulin in humans. Implications for insulin sensitivity and vascular tone
1Indiana University School of Medicine, Department of Medicine 46202-5124.
Abstract:
Insulin has a plethora of actions, most of which are initiated after interaction with its specific cell surface receptor on classical target tissues. Prominent among these actions is its ability to increase cellular permeability to glucose in muscle and fat. Heretofore, the cardiovascular actions of insulin in humans have received little attention. The effects of insulin on the cardiovascular system and, in particular, on skeletal muscle vasculature are physiological, specific, co-ordinated and appear to play an integral part in its overall action to promote the disposal of glucose and probably other substrates. The vascular actions of insulin should be added to the long list of actions initiated by this hormone, and are important to consider in the study of in vivo metabolism in health and disease.
Insights
Insulin significantly impacts cardiovascular function, particularly in skeletal muscle vasculature. These vascular effects are crucial for glucose uptake and overall metabolism in both health and disease.
Area of Science:
- Endocrinology
- Cardiovascular Physiology
- Metabolism
Background:
- Insulin is a key metabolic hormone regulating glucose uptake in muscle and fat.
- Insulin's cardiovascular effects, especially on skeletal muscle vasculature, are not well-understood.
- Classical insulin actions involve cell surface receptor interaction.
Purpose of the Study:
- To investigate the physiological effects of insulin on the cardiovascular system, focusing on skeletal muscle vasculature.
- To highlight the importance of insulin's vascular actions in overall glucose metabolism.
Main Methods:
- This study is a review of existing literature on insulin's cardiovascular effects.
- Analysis of physiological data concerning insulin's impact on vascular permeability and blood flow.
Main Results:
- Insulin exerts specific, coordinated physiological effects on the cardiovascular system.
- Insulin enhances cellular permeability to glucose in muscle and fat tissues.
- Insulin's actions on skeletal muscle vasculature are integral to glucose disposal.
Conclusions:
- Insulin's vascular actions are a significant, yet underappreciated, aspect of its function.
- Understanding insulin's cardiovascular effects is vital for studying in vivo metabolism in health and disease.
- These vascular effects should be integrated into the known actions of insulin.