Chronic high-fat feeding increases GIP and GLP-1 secretion without altering body weight. Am J Physiol Gastrointest Liver Physiol 2015 Nov 15;309(10):G807-15
Date
09/05/2015Pubmed ID
26336929Pubmed Central ID
PMC4652142DOI
10.1152/ajpgi.00351.2013Scopus ID
2-s2.0-84947268056 (requires institutional sign-in at Scopus site) 20 CitationsAbstract
The incretin hormones, glucose-dependent insulinotropic polypeptide (GIP) and glucagon-like peptide-1 (GLP-1), enhance postprandial insulin secretion, promote adipogenesis, and regulate gastrointestinal motility and food intake. To date, a consensus on how the incretin response is altered in obesity is lacking. We investigated the effects of chronic high-fat (HF) feeding on incretin secretion in the lymph fistula rat model. Male Sprague-Dawley rats (8 wk) were provided a semipurified AIN93M HF or low-fat (LF) diet ad libitum for 3 or 13 wk; a HF pair-fed (HF-PF) group was included as a control during the 3-wk feeding trial. Energy intake, body weight, and body composition were regularly monitored. At the culmination of the feeding period, an intestinal lymphatic duct cannula and duodenal infusion tube were installed. All animals were challenged with a 3-ml Ensure bolus (3.125 kcal/animal) to measure lymphatic incretin secretion. Despite a significantly higher energy intake, both the 3-wk and 13-wk HF-fed animals did not have an increase in body weight and only a slight increase in body fat compared with LF-fed rats. Following the duodenal Ensure challenge, the 3-wk and 13-wk HF-fed rats had significantly greater lymphatic GIP and GLP-1 secretion than the LF-fed animals. Additionally, the HF-PF group displayed a secretion profile similar to the HF-fed animals for GIP but a similar pattern to the LF-fed animals for GLP-1. The HF-PF data suggest that the increased GIP secretion is driven by the greater percentage of fat intake, whereas the increased GLP-1 secretion is driven by the excess caloric intake.
Author List
Wang F, Yoder SM, Yang Q, Kohan AB, Kindel TL, Wang J, Tso PAuthor
Tammy Lyn Kindel MD, PhD Associate Professor in the Surgery department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
AdipogenesisAnimals
Body Composition
Body Weight
Diet, High-Fat
Dietary Fats
Disease Models, Animal
Gastric Inhibitory Polypeptide
Gastrointestinal Motility
Glucagon-Like Peptide 1
Incretins
Insulin
Male
Obesity
Postprandial Period
Rats
Rats, Sprague-Dawley