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Human galanin reduces plasma norepinephrine levels in man
E C degli Uberti1, M R Ambrosio, M Bondanelli
1Chair of Endocrinology, University of Ferrara, Italy.
The Journal of Clinical Endocrinology and Metabolism
|June 1, 1995
Summary
Human galanin (GAL) impacts the sympathetic nervous system by reducing norepinephrine release and altering heart rate and blood pressure responses. This suggests GAL plays a role in regulating the human cardiovascular and autonomic nervous systems.
Area of Science:
- Neuroscience
- Cardiovascular Physiology
- Autonomic Nervous System Research
Background:
- Galanin (GAL), a neuropeptide, is found in both the central and peripheral nervous systems, often alongside catecholamines.
- Understanding GAL's role in human sympathetic nervous system activity is crucial for comprehending autonomic regulation.
Purpose of the Study:
- To investigate the effects of human galanin (hGAL) infusion on sympathetic nervous system markers in healthy volunteers.
- To elucidate the impact of hGAL on norepinephrine and epinephrine levels, heart rate, and blood pressure.
Main Methods:
- Infusion of human galanin (hGAL) or saline in eight healthy male volunteers for 60 minutes.
- Measurement of plasma norepinephrine and epinephrine, heart rate, and blood pressure in supine and upright positions.
Main Results:
- hGAL significantly decreased supine and upright-stimulated norepinephrine release.
- hGAL increased heart rate in both supine and upright positions.
- hGAL blunted blood pressure responses upon assuming the upright posture but enhanced epinephrine release.
Conclusions:
- Human galanin (hGAL) appears to exert an inhibitory modulation on sympathetic outflow in humans.
- hGAL is involved in the regulation of the cardiovascular and autonomic nervous systems, influencing heart rate and blood pressure dynamics.