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A Hepatocyte FOXN3-α Cell Glucagon Axis Regulates Fasting Glucose.

08:00 EDT 10th July 2018 | BioPortfolio

Summary of "A Hepatocyte FOXN3-α Cell Glucagon Axis Regulates Fasting Glucose."

The common genetic variation at rs8004664 in the FOXN3 gene is independently and significantly associated with fasting blood glucose, but not insulin, in non-diabetic humans. Recently, we reported that primary hepatocytes from rs8004664 hyperglycemia risk allele carriers have increased FOXN3 transcript and protein levels and liver-limited overexpression of human FOXN3, a transcriptional repressor that had not been implicated in metabolic regulation previously, increases fasting blood glucose in zebrafish. Here, we find that injection of glucagon into mice and adult zebrafish decreases liver Foxn3 protein and transcript levels. Zebrafish foxn3 loss-of-function mutants have decreased fasting blood glucose, blood glucagon, liver gluconeogenic gene expression, and α cell mass. Conversely, liver-limited overexpression of foxn3 increases α cell mass. Supporting these genetic findings in model organisms, non-diabetic rs8004664 risk allele carriers have decreased suppression of glucagon during oral glucose tolerance testing. By reciprocally regulating each other, liver FOXN3 and glucagon control fasting glucose.

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Journal Details

This article was published in the following journal.

Name: Cell reports
ISSN: 2211-1247
Pages: 312-319

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Medical and Biotech [MESH] Definitions

Hepatocyte nuclear factor 1-alpha is a transcription factor found in the LIVER; PANCREAS; and KIDNEY that regulates HOMEOSTASIS of GLUCOSE.

Cell surface receptors that bind glucagon with high affinity and trigger intracellular changes which influence the behavior of cells. Activation of glucagon receptors causes a variety of effects; the best understood is the initiation of a complex enzymatic cascade in the liver which ultimately increases the availability of glucose to body organs.

A test to determine the ability of an individual to maintain HOMEOSTASIS of BLOOD GLUCOSE. It includes measuring blood glucose levels in a fasting state, and at prescribed intervals before and after oral glucose intake (75 or 100 g) or intravenous infusion (0.5 g/kg).

G-PROTEIN COUPLED CELL SURFACE RECEPTORS that bind GLUCAGON-LIKE PEPTIDES and are expressed by cells in pancreatic, intestinal, and neural tissues. These receptors regulate cellular responses to BLOOD GLUCOSE, INSULIN, and INFLAMMATION signals.

A peptide of 36 or 37 amino acids that is derived from PROGLUCAGON and mainly produced by the INTESTINAL L CELLS. GLP-1(1-37 or 1-36) is further N-terminally truncated resulting in GLP-1(7-37) or GLP-1-(7-36) which can be amidated. These GLP-1 peptides are known to enhance glucose-dependent INSULIN release, suppress GLUCAGON release and gastric emptying, lower BLOOD GLUCOSE, and reduce food intake.

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