Central bombesin inhibits food intake and the orexigenic effect of neuropeptide Y in the neonatal chick.
It is well known that central injection of bombesin (BN) suppresses feeding in mammalian and avian species, but the anorexigenic effect of central BN are still open with special reference to the chick. The dose response (0, 0.1 and 0.5 microg) of intracerebroventricular (ICV) injection of BN was examined in Experiment 1. ICV injection of BN inhibited food intake in a dose-dependent manner. Experiment 2 was done to determine whether BN interacts with the orexigenic effect of neuropeptide Y (NPY) in the neonatal chick. Central administration of NPY (2.5 microg) greatly enhanced food intake, but co-injection of BN (0.5 microg) suppressed food intake. The dose response of NPY (2.5 microg) co-injected with three levels of BN (0, 0.1 and 0.5 microg) was examined in Experiment 3. ICV injection of BN attenuated the hyperphagia by NPY in a dose-related fashion. It is suggested that central BN may interact with NPY for the regulation of feeding in the neonatal chick.
Bungo
T
T
Laboratory of Feed Science, Department of Animal Science, Division of Animal and Marine Bioresources Science, Graduate School of Bioresource and Bioenvironmental Science, Kyushu University, Fukuoka 812-8581, Japan.
Ando
R
R
Kawakami
S
S
Ohgushi
A
A
Shimojo
M
M
Masuda
Y
Y
Furuse
M
M
D000818:Animals; D000831:Animals, Newborn; D001069:Appetite Regulation / Q000187:drug effects / Q000502:physiology; D019167:Appetite Stimulants / Q000008:administration & dosage / Q000037:antagonists & inhibitors; D001522:Behavior, Animal / Q000187:drug effects / Q000502:physiology; D001839:Bombesin / Q000008:administration & dosage / Q000378:metabolism*; D002645:Chickens; D004305:Dose-Response Relationship, Drug; D004435:Eating / Q000187:drug effects* / Q000502:physiology; D007276:Injections, Intraventricular; D008297:Male; D009478:Neuropeptide Y / Q000008:administration & dosage / Q000037:antagonists & inhibitors* / Q000378:metabolism*
D019167:Appetite Stimulants; D009478:Neuropeptide Y; D001839:Bombesin