Effect of bombesin on feeding behavior

Area of Science:

• Neuroendocrinology
• Gastrointestinal Physiology
• Appetite Regulation

Background:

• Bombesin and gastrin-releasing peptide are known to influence physiological processes.
• Previous research suggests a role for these peptides in modulating feeding behavior.
• The precise mechanisms underlying their effects on food intake are not fully elucidated.

Purpose of the Study:

• To investigate the effects of peripherally administered bombesin and gastrin-releasing peptide on food intake.
• To explore the potential mechanisms responsible for the observed reductions in food intake.

Main Methods:

• Administration of bombesin and gastrin-releasing peptide in rats, mice, baboons, and humans.
• Evaluation of food intake following peripheral injections and intravenous infusions.
• Assessment of the effects of various surgical and pharmacological interventions (vagotomy, ablations, lesions) on peptide-induced appetite suppression.

Main Results:

• Peripherally administered bombesin and gastrin-releasing peptide caused potent, dose-related reductions in food intake across species.
• These effects on meal size were consistent in rats, mice, baboons, and humans.
• The anorectic effect of bombesin was not abolished by subdiaphragmatic vagotomy, peripheral endocrine/neural ablations, or lesions of the area postrema/hypothalamus.
• Central hypothalamic injections of bombesin induced modest but specific reductions in food intake.

Conclusions:

• Peripherally administered bombesin and gastrin-releasing peptide are potent regulators of meal size.
• The mechanism of peripheral action is not dependent on vagal, peripheral neural, or specific central pathways like the area postrema or hypothalamus.
• Bombesin and related peptides may play a significant role in the physiological regulation of appetite and meal termination.