A Novel Intragastric Satiety-Inducing Device to Inhibit Weight Gain in Juvenile Pigs: a Pilot Study.
BACKGROUND AND AIMS
Minimally invasive therapies for obesity are a bridge between lifestyle interventions and bariatric surgery. We developed a novel device to reduce weight gain rate and evaluated its safety and efficacy in juvenile pigs.


METHODS
The intragastric satiety-inducing device (ISD) comprises a self-expandable esophageal metal stent connected to a star-shaped disc placed in the stomach fundus. Eight juvenile pigs were randomized into ISD (n = 5) and control (n = 3) groups. Body weight and serum ghrelin hormone were monitored weekly for 6 weeks. One pig was followed up for 4 additional weeks (rebound pig) after ISD removal. Histological examination and immunohistochemistry for the interstitial cells of Cajal (ICCs) were performed.


RESULTS
ISD placement was successful in all pigs. Two ISDs (40%) migrated at 4 and 5 weeks after placement. Weight gain rates were significantly lower in the ISD group than in the control group from week 1 to 6 but were higher in the rebound pig than in a control pig from week 7 to 10. Mean ghrelin hormone level was higher in the control group than in the ISD group from week 1 to 6. ISD induced reversible inflammatory changes in the esophagus and stomach fundus. The number of ICCs was lesser in ISD pigs than in control and rebound pigs.


CONCLUSIONS
ISD placement is feasible and safe in juvenile pigs. It decreases weight gain rate but induces reversible inflammatory reaction and tissue hyperplasia. Its mechanism may be related to pressure exertion on the stomach fundus or gastric motility alteration.
['Bakheet|Nader|N|', 'Na|Hee Kyong|HK|', 'Park|Jung-Hoon|JH|', 'Ryu|Dae Sung|DS|', 'Jeon|Jae Yong|JY|', 'Khashab|Mouen A|MA|', 'Kumbhari|Vivek|V|', 'Tsauo|Jiaywei|J|', 'Song|Ho-Young|HY|', 'Hu|Hong Tao|HT|', 'Kim|Do Hoon|DH|', 'Jung|Hwoon-Yong|HY|http://orcid.org/0000-0003-1281-5859']
D000818:Animals D050110:Bariatric Surgery D009767:Obesity, Morbid D010865:Pilot Projects D012527:Satiation D015607:Stents D013552:Swine D015430:Weight Gain
Obesity Interstitial cells of Cajal Self-expandable metallic stents