Intracerebroventricular neuropeptide Y increases gastric and pancreatic secretion in the dog.
BACKGROUND
Neuropeptide Y (NPY), a centrally located neurotransmitter, is known to increase appetite in fasted and satiated animals. In addition to evaluating NPY's effect on eating behavior, this study was intended to determine whether intracerebroventricular (ICV) NPY would have an effect on canine gastric and pancreatic secretion.


METHODS
Four dogs were prepared with cerebroventricular guides and gastric and pancreatic fistulas. ICV and intravenous NPY was administered during intragastric titration of a glucose and peptone meal. During this study, gastric and pancreatic secretion was measured, as well as insulin levels and pancreatic polypeptide (PP). An additional set of four dogs were prepared with esophageal fistulas and cerebroventricular guides, and the effect of ICV NPY on sham feeding was studied.


RESULTS
ICV NPY significantly increased sham feeding, meal-stimulated gastric and pancreatic secretion, basal gastric acid, pancreatic bicarbonate, insulin levels, and PP. Vagotomy blocked the effect of ICV NPY on gastric acid secretion in a urethane-anesthetized rat model with acute gastric fistula.


CONCLUSIONS
ICV NPY increased sham feeding, gastric and pancreatic secretion, insulin levels, and PP in the dogs. NPY's effect on gastric secretion was blocked by vagotomy in a rat model. NPY should be considered a candidate mediator of cephalic phase secretion.
Geoghegan
J G
JG
Department of Surgery, Duke University Medical Center, Durham, North Carolina.
Lawson
D C
DC
Cheng
C A
CA
Opara
E
E
Taylor
I L
IL
Pappas
T N
TN
D000704:Analysis of Variance; D000818:Animals; D001639:Bicarbonates / Q000378:metabolism; D004195:Disease Models, Animal; D004285:Dogs; D004435:Eating / Q000187:drug effects* / Q000502:physiology; D005260:Female; D005744:Gastric Acid / Q000378:metabolism; D005745:Gastric Acidity Determination; D005747:Gastric Fistula / Q000378:metabolism; D005753:Gastric Mucosa / Q000378:metabolism*; D005947:Glucose / Q000008:administration & dosage; D007275:Injections, Intravenous; D007276:Injections, Intraventricular; D007328:Insulin / Q000378:metabolism; D000078790:Insulin Secretion; D008297:Male; D009478:Neuropeptide Y / Q000008:administration & dosage* / Q000494:pharmacology*; D010179:Pancreas / Q000378:metabolism*; D010191:Pancreatic Polypeptide / Q000378:metabolism; D010461:Peptones / Q000008:administration & dosage; D051381:Rats; D017207:Rats, Sprague-Dawley; D014630:Vagus Nerve / Q000502:physiology
D001639:Bicarbonates; D007328:Insulin; D009478:Neuropeptide Y; D010461:Peptones; D010191:Pancreatic Polypeptide; D005947:Glucose