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- W2023274721 abstract "Gastric inhibitory polypeptide (GIP) is an incretin secreted from enteroendocrine K cells in response to meal ingestion. Recently free fatty acid receptor G protein-coupled receptor (GPR) 120 was identified as a lipid sensor involved in glucagon-like peptide-1 secretion. However, Gpr 120 gene expression and its role in K cells remain unclear, partly due to difficulties in separation of K cells from other intestinal epithelial cells. In this study, we purified K cells using GIP-green fluorescent protein (GFP) knock-in mice, in which K cells can be visualized by GFP fluorescence. GFP-positive cells (K cells) were observed in the small intestine but not in the stomach and colon. K cell number and GIP content in K cells were significantly higher in the upper small intestine than those in the lower small intestine. We also examined the expression levels of several free fatty acid receptors in K cells. Among free fatty acid receptors, GPR120 was highly expressed in the K cells of the upper small intestine compared with the lower small intestine. To clarify the role of GPR120 on K cells in vivo, we used GPR120-deficient mice (GPR120−/−). GPR120−/− exhibited significantly lower GIP secretion (75% reduction, P < .01) after lard oil ingestion compared with that in wild-type mice. Consistently, pharmacological inhibition of GPR120 with grifolic acid methyl ether in wild-type mice significantly attenuated lard oil-induced GIP secretion. In conclusion, GPR120 is expressed abundantly in K cells of the upper small intestine and plays a critical role in lipid-induced GIP secretion." @default.
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- W2023274721 date "2015-03-01" @default.
- W2023274721 modified "2023-10-14" @default.
- W2023274721 title "Free Fatty Acid Receptor GPR120 Is Highly Expressed in Enteroendocrine K Cells of the Upper Small Intestine and Has a Critical Role in GIP Secretion After Fat Ingestion" @default.
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- W2023274721 doi "https://doi.org/10.1210/en.2014-1653" @default.
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