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Am J Physiol Regul Integr Comp Physiol 279: R189-R195, 2000;
0363-6119/00 $5.00
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Vol. 279, Issue 1, R189-R195, July 2000

Interaction between CCK and a preload on reduction of food intake is mediated by CCK-A receptors in humans

Jean-Pierre Gutzwiller, Juergen Drewe, Silvia Ketterer, Pius Hildebrand, Alexandra Krautheim, and Christoph Beglinger

Division of Gastroenterology and Department of Research, University Hospital, CH-4031 Basel, Switzerland

Cholecystokinin (CCK) interacts with neural signals to induce satiety in several species, but the mechanisms are unclear. We therefore tested the hypothesis that alimentary CCK (CCK-A) receptors mediate the interaction of CCK with an appetizer on food intake in humans. CCK octapeptide (CCK-8, 0.75 µg infused over 10 min) or saline (placebo) with concomitant infusions of saline (placebo) or loxiglumide, a specific CCK-A antagonist, was infused into 16 healthy men with use of a double-blind, four-period design. All subjects received a standard 400-ml appetizer (amounting to 154 kcal) but were free to eat and drink thereafter as much as they wished. The effect of these infusions on feelings of hunger and satiety and on food intake was quantified. CCK-8 induced a reduction in calorie intake (P < 0.05) compared with saline. Furthermore, a decrease in hunger feelings (P < 0.05, saline-CCK-8 vs. all other treatments) and an increase in fullness were observed. These effects were antagonized for hunger and fullness by loxiglumide. We conclude that CCK-8 interacts with an appetizer to modulate satiety in humans. These effects are mediated by CCK-A receptors.

appetite; alimentary cholecystokinin receptors; loxiglumide


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