Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/121092
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Type: Journal article
Title: Effects of intraduodenal infusion of the bitter tastant, quinine, on antropyloroduodenal motility, plasma cholecystokinin, and energy intake in healthy men
Author: Bitarafan, V.
Fitzgerald, P.C.
Little, T.J.
Meyerhof, W.
Wu, T.
Horowitz, M.
Feinle-Bisset, C.
Citation: Journal of Neurogastroenterology and Motility, 2019; 25(3):413-422
Publisher: Korean Society of Neurogastroenterology and Motility
Issue Date: 2019
ISSN: 2093-0879
2093-0887
Statement of
Responsibility: 
Vida Bitarafan, Penelope C E Fitzgerald, Tanya J Little, Wolfgang Meyerhof, Tongzhi Wu, Michael Horowitz and Christine Feinle-Bisset
Abstract: Background/Aims:Nutrient-induced gut hormone release (eg, cholecystokinin [CCK]) and the modulation of gut motility (particularly pyloric stimulation) contribute to the regulation of acute energy intake. Non-caloric bitter compounds, including quinine, have recently been shown in cell-line and animal studies to stimulate the release of gastrointestinal hormones by activating bitter taste receptors expressed throughout the gastrointestinal tract, and thus, may potentially suppress energy intake without providing additional calories. This study aims to evaluate the effects of intraduodenally administered quinine on antropyloroduodenal pressures, plasma CCK and energy intake. Methods:Fourteen healthy, lean men (25 ± 5 years; BMI: 22.5 ± 2.0 kg/m2) received on 4 separate occasions, in randomized, double-blind fashion, 60-minute intraduodenal infusions of quinine hydrochloride at doses totaling 37.5 mg ("Q37.5"), 75 mg ("Q75") or 225 mg ("Q225"), or control (all 300 mOsmol). Antropyloroduodenal pressures (high-resolution manometry), plasma CCK (radioimmunoassay), and appetite perceptions/gastrointestinal symptoms (visual analog questionnaires) were measured. Ad libitum energy intake (buffet-meal) was quantified immediately post-infusion. Oral quinine taste-thresholds were assessed on a separate occasion using 3-alternative forced-choice procedure. Results:All participants detected quinine orally (detection-threshold: 0.19 ± 0.07 mmol/L). Intraduodenal quinine did not affect antral, pyloric or duodenal pressures, plasma CCK (pmol/L [peak]; control: 3.6 ± 0.4, Q37.5: 3.6 ± 0.4, Q75: 3.7 ± 0.3, Q225: 3.9 ± 0.4), appetite perceptions, gastrointestinal symptoms or energy intake (kcal; control: 1088 ± 90, Q37.5: 1057 ± 69, Q75: 1029 ±7 0, Q225: 1077 ± 88). Conclusions:Quinine, administered intraduodenally over 60 minutes, even at moderately high doses, but low infusion rates, does not modulate appetite-related gastrointestinal functions or energy intake.
Keywords: Cholecystokinin; Energy intake; Gastrointestinal hormones; Pylorus; Quinine
Rights: © The Korean Society of Neurogastroenterology and Motility. All rights reserved. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
RMID: 0030099548
DOI: 10.5056/jnm19036
Grant ID: http://purl.org/au-research/grants/nhmrc/1103020
http://purl.org/au-research/grants/nhmrc/1022706
http://purl.org/au-research/grants/nhmrc/1078471
Appears in Collections:Medicine publications

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