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Related Experiment Videos

Vasoactive intestinal peptide: cardiovascular effects.

R J Henning1, D R Sawmiller

  • 1Department of Medicine, University of South Florida College of Medicine and the James A. Haley Hospital, Tampa, FL 33612, USA.

Cardiovascular Research
|December 21, 2000
PubMed
Summary
This summary is machine-generated.

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Vasoactive intestinal peptide (VIP) is a potent vasodilator and neuromodulator found in the nervous system. This peptide significantly impacts cardiovascular function by increasing coronary blood flow, enhancing cardiac contractility, and elevating heart rate.

Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Pharmacology

Background:

  • Vasoactive intestinal peptide (VIP) acts as a neurotransmitter/neuromodulator in both peripheral and central nervous systems.
  • VIP is found in significant concentrations across various organs, including the heart, and is a potent vasodilator.
  • Its release is stimulated by nerve stimulation and various agonists, acting via adenylyl cyclase activation.

Purpose of the Study:

  • To investigate the role and effects of VIP in cardiovascular regulation.
  • To examine VIP's influence on coronary blood flow, cardiac contractility, and heart rate.

Main Methods:

  • Review of existing literature on VIP distribution and function in cardiovascular tissues.
  • Analysis of studies involving exogenous VIP administration in animal models and humans.

Related Experiment Videos

  • Examination of VIP's effects during conditions like coronary artery occlusion and reperfusion.

    • Main Results:

    • VIP significantly increases coronary artery cross-sectional area and blood flow while decreasing vascular resistance.
    • VIP administration enhances atrial and ventricular contractility and has a potent positive inotropic effect.
    • Endogenous or exogenous VIP administration increases heart rate, with a more potent effect than norepinephrine.

    Conclusions:

    • VIP plays a crucial role in regulating coronary blood flow, cardiac contraction, and heart rate.
    • VIP's presence and effects in the heart suggest its importance in overall cardiovascular function.
    • Further research is ongoing to fully define VIP's physiological role in cardiovascular regulation.