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Bombesin and cholecystokinin differentially affect ingestive microstructural variables whether given alone or in
T H Moran1, T S Carrigan, G J Schwartz
1Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.
Behavioral Neuroscience
|October 1, 1996
Summary
Cholecystokinin (CCK) and bombesin both reduce glucose intake in rats. These peptides act through different mechanisms, affecting distinct aspects of feeding behavior without synergistic effects.
Area of Science:
- Neuroscience
- Behavioral Science
- Endocrinology
Background:
- Cholecystokinin (CCK) and bombesin are peptides known to influence feeding behavior.
- Understanding their individual and combined effects on ingestive behavior is crucial for appetite regulation research.
Purpose of the Study:
- To investigate the effects of combined cholecystokinin (CCK) and bombesin on liquid glucose intake in rats.
- To analyze how these peptide combinations impact the microstructural components of ingestive behavior.
Main Methods:
- Rats were administered dose combinations of CCK and bombesin 5 minutes prior to access to a liquid glucose solution.
- Ingestive behavior was analyzed by measuring intake and microstructural components such as burst size, burst number, cluster size, and cluster number.
Main Results:
- Both CCK and bombesin demonstrated dose-related inhibition of glucose intake.
- Combined peptide administration did not produce greater inhibition than the sum of individual peptide effects.
- CCK specifically reduced burst and cluster size, while bombesin reduced burst and cluster number.
- The effects of each peptide were independent of the presence of the other.
Conclusions:
- CCK and bombesin exhibit distinct mechanisms of action in inhibiting feeding behavior.
- These findings contribute to understanding the neurobiological basis of appetite control and the roles of specific peptides.