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Related Experiment Video

Updated: Jul 14, 2026

Confocal Imaging of Neuropeptide Y-pHluorin: A Technique to Visualize Insulin Granule Exocytosis in Intact Murine and Human Islets

Confocal Imaging of Neuropeptide Y-pHluorin: A Technique to Visualize Insulin Granule Exocytosis in Intact Murine and Human Islets

Published on: September 13, 2017

Foxa2 regulates multiple pathways of insulin secretion.

Kristen A Lantz¹, Marko Z Vatamaniuk, John E Brestelli

¹Department of Genetics, Children's Hospital of Philadelphia, Philadelphia, PA, USA.

The Journal of Clinical Investigation

|August 18, 2004

Summary

The transcription factor Foxa2 is crucial for regulating insulin secretion in pancreatic beta cells. Its deficiency causes abnormal insulin release and impacts genes linked to persistent hyperinsulinemic hypoglycemia of infancy (PHHI).

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Confocal Imaging of Neuropeptide Y-pHluorin: A Technique to Visualize Insulin Granule Exocytosis in Intact Murine and Human Islets

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Measuring Relative Insulin Secretion using a Co-Secreted Luciferase Surrogate

Measuring Relative Insulin Secretion using a Co-Secreted Luciferase Surrogate

Published on: June 25, 2019

Area of Science:

Endocrinology
Molecular Biology
Genetics

Background:

Insulin secretion by pancreatic beta cells is vital for glucose homeostasis and is dysregulated in diseases like type 2 diabetes and PHHI.
Persistent hyperinsulinemic hypoglycemia of infancy (PHHI) is often linked to mutations in the ATP-sensitive K(+) channel (SUR1/KIR6.2).

Purpose of the Study:

To investigate the role of the winged-helix transcription factor Foxa2 in pancreatic beta cell function and insulin secretion.
To establish the first mouse model for PHHI by conditionally deleting the Foxa2 gene in beta cells.

Main Methods:

Conditional deletion of the Foxa2 gene in pancreatic beta cells of mice.
Analysis of insulin secretion from isolated islets in response to amino acids and glucose.
RNA in situ hybridization to assess gene expression (SUR1, KIR6.2).
Expression profiling to identify Foxa2 target genes, including Hadhsc.
Cotransfection and in vivo chromatin immunoprecipitation to confirm direct Foxa2-Hadhsc interaction.

Main Results:

Foxa2 deficiency in beta cells led to excessive insulin release in response to amino acids.
Glucose-stimulated insulin secretion was completely abolished in Foxa2-deficient islets.
Expression of SUR1 and KIR6.2 genes was found to be Foxa2-dependent.
Hadhsc, a gene whose deficiency causes PHHI in humans, was identified as a direct Foxa2 target.

Conclusions:

Foxa2 is an essential activator of genes involved in multiple pathways regulating insulin secretion.
The study establishes Foxa2 as a key regulator in pancreatic beta cell function and implicates it in PHHI pathogenesis.
Foxa2 controls the expression of critical components of the ATP-sensitive K(+) channel and other pathways relevant to insulin secretion.