Journal
NUTRITION
Volume 39-40, Issue -, Pages 82-91Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.nut.2017.01.002
Keywords
Catch-up growth; Insulin resistance; Intestinal L cell; Glucagon-like peptide-1
Categories
Funding
- National Natural Science Foundation of China
Ask authors/readers for more resources
Objective: The aim of this study was to investigate whether insulin resistance can result in impaired glucagon-like peptide (GLP)-1 secretion and to determine whether insulin-sensitizing drugs could improve the secretion of GLP-1 in catch-up growth rats. Methods: Male Sprague Dawley rats were used to establish a catch-up growth model. At the end of weeks 6 and 14, these rats were euthanized to measure energy intake, body weight, plasma triacylglycerol, and nonesterified fatty acid. Fat mass percentage was analyzed by dual-energy x-ray absorptiometry scan. The GLP-1 concentrations were measured by enzyme-linked immunosorbent assay, the glucose infusion rates were measured by hyperinsulinemic-glucose clamp experiment. Quantification of the GLP-1 positive cells in distal ileum was done by immunohistochemical staining method. The L cell line NCI-H716 cells were treated in vitro with palmitate acid, the cells' viability, the carnitine palmitoyl transferase-1, and the insulin signaling pathway were detected. Results: Rats fed a high-fat diet rats had rapidly developed insulin resistance, impaired incretin effect, and a reduction in the number of intestinal L cells. The insulin sensitizers, metformin and pioglitazone, improved insulin resistance and the concentration of circulating GLP-1, increased the relative number of intestinal L cells to a certain degree. In vitro, the NCI-H716 cell viability was decreased and impaired insulin signaling pathway with palmitate acid treatment, metformin treatment could reverse these effects, whereas pioglitazone could not. Conclusions: Insulin resistance caused by a high-fat diet could result in reduced GLP-1 secretion; the insulin sensitizing drugs were able to improve the incretin effect in catch-up growth rats. (C) 2017 Published by Elsevier Inc.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available