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Obesity Surgery
Published in: Obesity Surgery 12/2017

01-12-2017 | Original Contributions

An Optimized IES Method and Its Inhibitory Effects and Mechanisms on Food Intake and Body Weight in Diet-Induced Obese Rats: IES for Obesity

Authors: Xinyue Wan, Jieyun Yin, Robert Foreman, Jiande D. Z. Chen

Published in: Obesity Surgery | Issue 12/2017

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Abstract

Purpose

This paper aims to optimize stimulation parameters and durations for intestinal electrical stimulation (IES) and to explore the effects and mechanisms of chronic IES with optimized methodology in obesity rats.

Materials and Methods

Sixteen diet-induced obese (DIO) rats were tested for food intake with four different sets of IES parameters each lasting 1 week. Then, another 12 DIO rats were used to test the effect of IES on food intake with different stimulation durations. Finally, 16 DIO rats were treated with IES or sham-IES for 4 weeks. Meal patterns, food intake, and body weight were observed. Mechanisms involving gastrointestinal motility, ghrelin, and glucagon-like peptide-1 (GLP-1) were studied.

Results

(1) Acute IES with different parameters showed different inhibitory effects on food intake, and the most effective parameters were 0.6 s on, 0.9 s off, 80 Hz, 2 ms, and 4 mA with which 26.3% decrease in food intake was noted (p < 0.001). (2) IES with daily treatment of 12 h was most effective in suppressing food intake compared with 1 or 6 h. (3) Four-week IES reduced net weight by 10.9% (p < 0.05 vs. sham-IES) and epididymal fat pad weight by 13.9% (p < 0.001). (4) IES delayed gastric emptying (p < 0.001) and accelerated intestinal transit (p < 0.05). (5) IES increased both fasting and postprandial plasma levels of GLP-1 but not ghrelin.

Conclusion

Twelve-hour daily IES using optimized stimulation parameters reduces food intake and body weight in DIO rats by altering gastrointestinal motility and GLP-1. The IES methodology derived in this study may have a therapeutic potential for obesity.
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Metadata
Title
An Optimized IES Method and Its Inhibitory Effects and Mechanisms on Food Intake and Body Weight in Diet-Induced Obese Rats: IES for Obesity
Authors
Xinyue Wan
Jieyun Yin
Robert Foreman
Jiande D. Z. Chen
Publication date
01-12-2017
Publisher
Springer US
Published in
Obesity Surgery / Issue 12/2017
Print ISSN: 0960-8923
Electronic ISSN: 1708-0428
DOI
https://doi.org/10.1007/s11695-017-2743-1

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