Cholecystokinin does not mediate glucose's cytoprotective effects.
Cold restraint stress produces acute gastric mucosal injury in association with altered gastric motility. Enteral nutrients prevent this injury in conjunction with inhibition of gastric emptying. Because cholecystokinin (CCK) is released by nutrients known to be cytoprotective and is thought to inhibit gastric emptying, we performed three experiments to see if CCK contributes to the gastric mucosal protection afforded by enteral nutrients. Our data show that enteral glucose protects the gastric mucosa and increases gastric volume, gastric luminal pH, and gastric mucin. Neither physiologic nor pharmacologic doses of CCK protected the mucosa. None of the other significant effects of glucose on gastric function during cold restraint were affected by exogenous CCK. Furthermore, antagonism of CCK receptors with L-364,718 did not have any independent effects, nor did it diminish the protection associated with enteral glucose. We conclude that enteral glucose protects the gastric mucosa from cold restraint injury in association with a number of potentially beneficial effects on gastric physiology, but none of the effects of glucose in this model appear to be mediated by CCK.
Ephgrave
K S
KS
Department of Surgery, University of Iowa College of Medicine, Iowa City 52246.
Kleiman-Wexler
R L
RL
Adair
C G
CG
Skaar
L M
LM
D000818:Animals; D001570:Benzodiazepinones / Q000494:pharmacology; D002766:Cholecystokinin / Q000502:physiology*; D003080:Cold Temperature; D020109:Devazepide; D005753:Gastric Mucosa / Q000166:cytology / Q000378:metabolism* / Q000503:physiopathology; D005947:Glucose / Q000502:physiology*; D008297:Male; D051381:Rats; D017208:Rats, Wistar
D001570:Benzodiazepinones; D002766:Cholecystokinin; D005947:Glucose; D020109:Devazepide