Effects of bombesin on behavior

Area of Science:

• Neuroscience
• Pharmacology
• Animal Behavior

Background:

• Bombesin is a peptide with diverse physiological effects.
• Its influence on gross behavior across different species is not fully understood.

Purpose of the Study:

• To investigate the behavioral effects of bombesin administration in various vertebrate species.
• To determine the dose-response relationship and routes of administration for bombesin-induced behaviors in mammals.

Main Methods:

• Bombesin was administered centrally (intracerebroventricular and intrathecal) and peripherally to goldfish, frogs, mice, rats, guinea pigs, rabbits, chicks, pigeons, and monkeys.
• Behavioral responses, including scratching and grooming, were observed and quantified.
• Bombesin receptor antagonists (Spantide and a Substance P analog) were used in rats to explore antagonism.

Main Results:

• Goldfish, frogs, chicks, and pigeons showed no significant behavioral changes.
• Mice, rats, guinea pigs, rabbits, and monkeys exhibited behaviors indicative of altered skin sensation, primarily scratching and grooming, following central bombesin administration.
• In mice, central administration was significantly more potent than peripheral administration for inducing scratching.
• Bombesin-induced behaviors in rats differed qualitatively from those induced by ACTH and TRH.
• Tested bombesin receptor antagonists did not significantly alter bombesin-induced scratching or hypothermia in rats.

Conclusions:

• Bombesin induces species-specific behavioral responses, primarily affecting somatosensory perception in mammals.
• Central administration of bombesin is more effective in eliciting behavioral changes in mammals compared to peripheral routes.
• Further research is needed to elucidate the precise mechanisms and receptor interactions underlying bombesin's effects on behavior.