Document Detail

Disassociation between preprandial gut peptide release and food-anticipatory activity.
MedLine Citation:
PMID:  22128024     Owner:  NLM     Status:  MEDLINE    
Animals learn to anticipate a meal as evidenced by increases in premeal activity. This learned response appears to be independent of the nutrient status of an animal because food-anticipatory activity (FAA) can be seen after entrainment by a highly palatable food when rats remain ad libitum on chow. Mealtime feeding not only induces an increase in activity but also appears to entrain the secretion of various peptides prior to a meal including insulin, ghrelin, and glucagon-like peptide-1 (GLP-1). It is not clear whether these meal-anticipatory changes in peptides are causally associated with FAA. To assess whether FAA and preprandial peptide changes co-occur with meal entrainment using different diets, rats were conditioned to receive a 6-h chow meal, 6-h high-fat meal, or 2 h access of chocolate while ad libitum on chow in the middle of the light cycle. FAA was measured for 4 h prior to mealtime. Rats were then killed at 90, 60, and 30 min prior to mealtime and plasma was collected. Although the chocolate-entrained rats showed comparable FAA with the nonchocolate-entrained animals, they did not show anticipatory increases in the ghrelin or GLP-1. All entrainment conditions induced a decrease in insulin and an increase in glucose prior to mealtime. These data suggest that separate mechanisms may underlie the preprandial increases in ghrelin and GLP-1 and changes in FAA, insulin, and glucose.
Megan J Dailey; Katherine C Stingl; Timothy H Moran
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2011-11-29
Journal Detail:
Title:  Endocrinology     Volume:  153     ISSN:  1945-7170     ISO Abbreviation:  Endocrinology     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2011-12-23     Completed Date:  2012-03-05     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  0375040     Medline TA:  Endocrinology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  132-42     Citation Subset:  AIM; IM    
Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, 720 Rutland Avenue, Ross 618, Baltimore, Maryland 21205, USA.
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MeSH Terms
Anticipation, Psychological / physiology
Biological Clocks / physiology
Blood Glucose / metabolism
Body Weight / physiology
Conditioning (Psychology) / physiology
Digestive System / secretion
Eating / physiology
Feeding Behavior / physiology*,  psychology*
Gastrointestinal Hormones / blood,  secretion*
Ghrelin / blood,  secretion
Glucagon-Like Peptide 1 / blood,  secretion
Insulin / blood,  secretion
Rats, Sprague-Dawley
Grant Support
Reg. No./Substance:
0/Blood Glucose; 0/Gastrointestinal Hormones; 0/Ghrelin; 0/Insulin; 89750-14-1/Glucagon-Like Peptide 1

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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