Infusion of CCK-8 into hepatic-portal vein fails to reduce food intake in rats.
If the putative satiating effect of endogenous cholecystokinin (CCK) is produced through a circulating hormonal mechanism, then administration of exogenous CCK into the hepatic-portal vein should decrease meal size. To test this, one form of endogenous CCK, the C-terminal octapeptide CCK-8, was infused intraportally in doses of 4 and 8 micrograms/kg just prior to a test meal. Neither dose decreased food intake after intraportal infusion even though intraperitoneal administration of 4 micrograms/kg CCK-8 decreased meal size approximately 50% in the same rats. The results suggest that if endogenous CCK-8 has a satiating effect, it acts primarily through a paracrine mechanism.
D000818:Animals; D004435:Eating / Q000187:drug effects*; D006503:Hepatic Veins / Q000502:physiology*; D007262:Infusions, Intravenous; D008297:Male; D011169:Portal Vein / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains; D012844:Sincalide / Q000008:administration & dosage* / Q000494:pharmacology
D012844:Sincalide