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Gastroenterology. 2011 Mar;140(3):903-12. doi: 10.1053/j.gastro.2010.10.012. Epub 2010 Oct 16.

The G-protein-coupled receptor GPR40 directly mediates long-chain fatty acid-induced secretion of cholecystokinin.

Author information

1
Digestive Diseases Branch, National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.

Abstract

BACKGROUND & AIMS:

Long-chain fatty acid receptors G-protein-coupled receptor 40 (GPR40) (FFAR1) and GPR120 have been implicated in the chemosensation of dietary fats. I cells in the intestine secrete cholecystokinin (CCK), a peptide hormone that stimulates digestion of fat and protein, but these cells are rare and hard to identify. We sought to determine whether dietary fat-induced secretion of CCK is directly mediated by GPR40 expressed on I cells.

METHODS:

We used fluorescence-activated cell sorting to isolate a pure population of I cells from duodenal mucosa in transgenic mice that expressed green fluorescent protein under the control of the CCK promoter (CCK-enhanced green fluorescent protein [eGFP] bacterial artificial chromosome mice). CCK-eGFP cells were evaluated for GPR40 expression by quantitative reverse transcription polymerase chain reaction and immunostaining. GPR40(-/-) mice were bred with CCK-eGFP mice to evaluate functional relevance of GPR40 on long-chain fatty acid-stimulated increases in [Ca(2+)]i and CCK secretion in isolated CCK-eGFP cells. Plasma levels of CCK after olive oil gavage were compared between GPR40(+/+) and GPR40(-/-) mice.

RESULTS:

Cells that expressed eGFP also expressed GPR40; expression of GPR40 was 100-fold greater than that of cells that did not express eGFP. In vitro, linoleic, oleic, and linolenic acids increased [Ca(2+)]i; linolenic acid increased CCK secretion by 53% in isolated GPR40(+/+) cells that expressed eGFP. In contrast, in GPR40(-/-) that expressed eGFP, [Ca(2+)]i response to linoleic acid was reduced by 50% and there was no significant CCK secretion in response to linolenic acid. In mice, olive oil gavage significantly increased plasma levels of CCK compared with pregavage levels: 5.7-fold in GPR40(+/+) mice and 3.1-fold in GPR40(-/-) mice.

CONCLUSIONS:

Long-chain fatty acid receptor GPR40 induces secretion of CCK by I cells in response to dietary fat.

PMID:
20955703
PMCID:
PMC4717904
DOI:
10.1053/j.gastro.2010.10.012
[Indexed for MEDLINE]
Free PMC Article

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