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Cardiac function in neuropeptide Y Y4 receptor-knockout mice
Margaret A Smith-White1, Herbert Herzog, Erica K Potter
1Prince of Wales Medical Research Institute, University of New South Wales, Barker St., Randwick, 2031 Sydney, Australia. m.smith-white@unsw.edu.au
Regulatory Peptides
|December 7, 2002
Summary
Neuropeptide Y Y4 receptor knockout mice exhibit disrupted autonomic balance, showing slower heart rates and reduced blood pressure responses to NPY, indicating altered cardiovascular control.
Area of Science:
- Cardiovascular Physiology
- Neuroendocrinology
- Autonomic Nervous System Research
Background:
- Neuropeptide Y (NPY) plays a role in cardiovascular regulation.
- The Y4 receptor's specific function in autonomic control is not fully elucidated.
- Understanding NPY receptor roles is crucial for cardiovascular health.
Purpose of the Study:
- To investigate the role of the NPY Y4 receptor in autonomic control of cardiovascular function.
- To compare cardiovascular responses in Y4 receptor-knockout mice versus wild-type controls.
- To assess the impact of NPY and pancreatic polypeptide (PP) on heart rate and blood pressure.
Main Methods:
- Utilized Y4 receptor-knockout mice and control littermates.
- Administered NPY, PP, and receptor-specific antagonists.
- Measured heart rate (pulse interval) and blood pressure under anesthesia.
- Performed vagotomy to assess vagal nerve influence.
Main Results:
- Y4 receptor-knockout mice displayed significantly lower heart rate and blood pressure.
- NPY-induced pressor response and vagal inhibitory activity were reduced in knockout mice.
- Pancreatic polypeptide (PP) had no significant effect on cardiovascular parameters.
- Evidence suggests the effects are not mediated by Y1 receptors or a specific NPY fragment.
Conclusions:
- Y4 receptor deletion disrupts the autonomic balance within the cardiovascular system.
- Reduced vasoconstrictor and vagal activity in knockout mice may stem from altered sympathetic activity.
- The NPY Y4 receptor is a key modulator of cardiovascular autonomic control.