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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Diabetes+Investig
2016 ; 7 Suppl 1
(Suppl 1
): 20-6
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Mechanisms of fat-induced gastric inhibitory polypeptide/glucose-dependent
insulinotropic polypeptide secretion from K cells
#MMPMID27186351
Yamane S
; Harada N
; Inagaki N
J Diabetes Investig
2016[Apr]; 7 Suppl 1
(Suppl 1
): 20-6
PMID27186351
show ga
Gastric inhibitory polypeptide/glucose-dependent insulinotropic polypeptide (GIP)
is one of the incretins, which are gastrointestinal hormones released in response
to nutrient ingestion and potentiate glucose-stimulated insulin secretion. Single
fat ingestion stimulates GIP secretion from enteroendocrine K cells; chronic
high-fat diet (HFD) loading enhances GIP secretion and induces obesity in mice in
a GIP-dependent manner. However, the mechanisms of GIP secretion from K cells in
response to fat ingestion and GIP hypersecretion in HFD-induced obesity are not
well understood. We generated GIP-green fluorescent protein knock-in (GIP
(gfp/+)) mice, in which K cells are labeled by enhanced GIP-green fluorescent
protein. Microarray analysis of isolated K cells from GIP (gfp/+) mice showed
that both fatty acid-binding protein 5 and G protein-coupled receptor 120 are
highly expressed in K cells. Single oral administration of fat resulted in
significant reduction of GIP secretion in both fatty acid-binding protein 5- and
G protein-coupled receptor 120-deficient mice, showing that fatty acid-binding
protein 5 and G protein-coupled receptor 120 are involved in acute fat-induced
GIP secretion. Furthermore, the transcriptional factor, regulatory factor X6
(Rfx6), is highly expressed in K cells. In vitro experiments using the mouse
enteroendocrine cell line, STC-1, showed that GIP messenger ribonucleic acid
levels are upregulated by Rfx6. Expression levels of Rfx6 messenger ribonucleic
acid as well as that of GIP messenger ribonucleic acid were augmented in the
K cells of HFD-induced obese mice, in which GIP content in the small intestine is
increased compared with that in lean mice fed a control diet. These results
suggest that Rfx6 is involved in hypersecretion of GIP in HFD-induced obese
conditions by increasing GIP gene expression.