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The role of norepinephrine in feeding behavior
Neuroscience and Biobehavioral Reviews
|January 1, 1982
Summary
Inhibiting dopamine-beta-hydroxylase with FLA-63 disrupts feeding behavior in rats by reducing meal size. Norepinephrine (NE) systems are crucial for maintaining feeding responses, as shown by reinstated feeding after NE precursor or direct NE administration.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Pharmacology
Background:
- Dopamine-beta-hydroxylase (DBH) is a key enzyme in norepinephrine (NE) synthesis.
- NE plays a significant role in regulating feeding behavior.
- Understanding the neurochemical basis of feeding is crucial for addressing eating disorders.
Purpose of the Study:
- To investigate the role of norepinephrine in regulating feeding behavior.
- To examine the effects of dopamine-beta-hydroxylase inhibition on feeding in rats.
- To elucidate the neurochemical mechanisms underlying feeding regulation.
Main Methods:
- Administration of FLA-63 (a DBH inhibitor) and RO4-1284 (a vesicular reuptake inhibitor) to satiated and starved rats.
- Measurement of feeding behavior, including meal size and frequency.
- Assessment of norepinephrine depletion.
- Reinstatement of feeding using NE precursors (dl-threo-DOPs) or direct hypothalamic NE injections.
Main Results:
- FLA-63 alone reduced meal size in satiated rats but had minimal effect in starved rats.
- Combined FLA-63 and RO4-1284 significantly reduced feeding and depleted NE by 99%.
- Feeding was restored by administering NE precursors or direct hypothalamic NE.
Conclusions:
- Norepinephrine systems are essential for maintaining the consummatory response in feeding.
- Disruption of NE transmission leads to feeding inhibition.
- The findings highlight the role of NE in feeding behavior, particularly in relation to other neurochemical systems.