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- W2000591868 abstract "In response to fat intake, enteroendocrine K cells release the hormone glucose-dependent insulinotropic polypeptide (GIP). GIP acts on adipocytes to increase lipid uptake and enhance adipokine secretion, promoting weight gain and insulin resistance. Modulation of intestinal GIP release could therefore represent a therapeutic strategy for the treatment and prevention of obesity and diabetes. However, the prospects of using drugs to effectively target specific enteroendocrine cell types have been tempered by the realization that these cells share similar transcriptional programs and frequently employ common mechanisms of hormone secretion. To gain novel insights into the regulation of GIP release, we generated knock-in mice expressing green fluorescent protein (GFP) under the control of the endogenous GIP promoter that enable the isolation of a purified population of small intestine K cells. Using RNA sequencing, we comprehensively characterized the transcriptomes of GIP(GFP) cells as well as the entire enteroendocrine lineage derived from Neurogenin3-expressing progenitors. Among the genes differentially expressed in GIP(GFP) cells, we identified and validated fatty acid-binding protein 5 (FABP5) as a highly expressed marker of GIP-producing cells that is absent in other enteroendocrine cell types. FABP5 promotes intracellular transport and inactivation of endocannabinoids, including anandamide, which inhibits GIP release. Remarkably, we found that circulating levels of GIP were significantly decreased in FABP5-deficient mice in the fasting state and in response to acute, oral fat diet administration. Our findings highlight the power of RNA sequencing to uncover molecular signatures of specific enteroendocrine cell types that can potentially be exploited for therapeutic purposes in the treatment of metabolic disorders." @default.
- W2000591868 created "2016-06-24" @default.
- W2000591868 creator A5039496277 @default.
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- W2000591868 date "2014-11-01" @default.
- W2000591868 modified "2023-09-29" @default.
- W2000591868 title "RNA-Seq Analysis of Enteroendocrine Cells Reveals a Role for FABP5 in the Control of GIP Secretion" @default.
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- W2000591868 doi "https://doi.org/10.1210/me.2014-1194" @default.
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