Decreased intestinal nutrient response in diet-induced obese rats: role of gut peptides and nutrient receptors.
Int J Obes (Lond)
; 37(3): 375-81, 2013 Mar.
Article
de En
| MEDLINE
| ID: mdl-22546775
ABSTRACT
BACKGROUND AND AIMS:
Diet-induced obesity (DIO) is an excellent model for examining human obesity comprising both genotypic and environmental (diet) factors. Decreased responsiveness to peripheral satiety signaling may be responsible for the hyperphagia in this model. In this study, we investigated responses to nutrient-induced satiation in outbred DIO and DIO-resistant (DR) rats fed a high-energy/high-fat (HE/HF) diet as well as intestinal satiety peptide content, intestinal nutrient-responsive receptor abundance and vagal anorectic receptor expression.METHODS:
Outbred DIO and DR rats fed a HE/HF diet were tested for short-term feeding responses following nutrient (glucose and intralipid (IL)) gastric loads. Gene and protein expressions of intestinal satiety peptides and fatty acid-responsive receptors were examined from isolated proximal intestinal epithelial cells and cholecystokinin-1 receptor (CCK-1R) and leptin receptor (LepR) mRNA from the nodose ganglia of DIO and DR animals.RESULTS:
DIO rats were less responsive to IL- (P<0.05) but not glucose-induced suppression of food intake compared with DR rats. DIO rats exhibited decreased CCK, peptide YY (PYY) and glucagon-like peptide-1 (GLP-1; P<0.05 for each) protein expression compared with DR rats. Also, DIO rats expressed more G-protein-coupled receptor 40 (GPR40; P<0.0001), GPR41 (P<0.001) and GPR120 (P<0.01) relative to DR rats. Finally, there were no differences in mRNA expression for CCK-1R and LepR in the nodose ganglia of DIO and DR rats.CONCLUSIONS:
Development of DIO may be partly due to decreased fat-induced satiation through low levels of endogenous satiety peptides, and changes in intestinal nutrient receptors.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Cellules réceptrices sensorielles
/
Satiété
/
Cellules entéroendocrines
/
Tube digestif
/
Muqueuse gastrique
/
Obésité
Type d'étude:
Prognostic_studies
Limites:
Animals
Langue:
En
Journal:
Int J Obes (Lond)
Sujet du journal:
METABOLISMO
Année:
2013
Type de document:
Article
Pays d'affiliation:
France