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Related Experiment Video

Updated: Jul 18, 2026

Studying the Hypothalamic Insulin Signal to Peripheral Glucose Intolerance with a Continuous Drug Infusion System into the Mouse Brain

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MAFA controls genes implicated in insulin biosynthesis and secretion.

H Wang¹, T Brun, K Kataoka

¹Department of Cell Physiology and Metabolism, University Medical Center, 1, Michel-Servet, CH-1211, Geneva 4, Switzerland. haiyan.wang.hw2@Roche.com

|December 7, 2006

Summary

The transcription factor MAFA is a master regulator of beta cell function, controlling insulin production and other key genes. Its activity is crucial for maintaining glucose homeostasis and insulin secretion.

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Area of Science:

Endocrinology
Molecular Biology
Genetics

Background:

Beta cells are crucial for glucose homeostasis.
Transcription factors play a vital role in regulating beta cell function.
MAFA's specific role in beta cell gene regulation requires further elucidation.

Purpose of the Study:

To investigate the role of the transcription factor MAFA in regulating beta cell gene expression and function.
To determine MAFA's impact on insulin production and secretion.
To identify downstream targets of MAFA in beta cells.

Main Methods:

Established INS-1 stable cell lines for inducible MAFA manipulation (upregulation and downregulation).
Assessed MAFA binding to the insulin promoter.
Measured insulin mRNA levels, protein content, and glucose-stimulated insulin secretion.
Analyzed the expression of key beta cell genes.

Main Results:

MAFA overexpression enhanced insulin promoter binding and insulin levels.
MAFA deficiency (DN-MAFA) reduced insulin promoter binding and insulin levels.
MAFA facilitated glucose-stimulated insulin secretion, while DN-MAFA blunted it.
MAFA positively regulated genes involved in glucose transport (GLUT2), beta cell development (PDX1, NKX6-1), insulin processing (PCSK1), and GLP1R signaling.

Conclusions:

MAFA is a master regulator of beta cell-specific gene expression and function.
MAFA is a key activator of insulin transcription and regulates genes critical for metabolism-secretion coupling, proinsulin processing, and GLP1R signaling.
MAFA's specific expression in human beta cells and glucose-dependent DNA-binding activity highlight its central role in pancreatic islet function.