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Related Concept Videos

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

Glucose Homeostasis: Pancreatic Islets and Insulin Secretion

The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
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Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
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Cell Specific Gene Expression

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Analysis of Beta-cell Function Using Single-cell Resolution Calcium Imaging in Zebrafish Islets
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Nkx2.2 regulates beta-cell function in the mature islet.

Michelle J Doyle1, Lori Sussel

  • 1Program in Molecular Biology, Department of Biochemistry and Genetics, University of Colorado Health Sciences Center, Aurora, Colorado, USA.

Diabetes
|April 26, 2007
PubMed
Summary

The Nkx2.2 transcription factor is crucial for maintaining mature beta-cell function and islet structure in adult mice. Disrupting Nkx2.2 leads to diabetes and impaired insulin secretion, revealing its essential role beyond embryonic development.

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Area of Science:

  • Endocrinology
  • Developmental Biology
  • Molecular Biology

Background:

  • Nkx2.2 is a key homeodomain transcription factor essential for pancreatic endocrine cell development.
  • While critical for embryonic beta-cell differentiation, its role in mature beta-cells was unclear.

Purpose of the Study:

  • To investigate the role of Nkx2.2 in the maintenance and function of mature pancreatic beta-cells in postnatal mice.
  • To determine if Nkx2.2 activator functions are required for mature beta-cell function.

Main Methods:

  • Generated transgenic mouse lines expressing a repressor derivative of Nkx2.2 in mature beta-cells.
  • Assessed beta-cell function, islet structure, and expression of beta-cell-specific markers (MafA, Glut2, insulin).
  • Evaluated glucose tolerance and insulin secretion in Nkx2.2-repressor mice.

Main Results:

  • Nkx2.2-repressor expression disrupted endogenous Nkx2.2, downregulating MafA and Glut2.
  • Transgenic mice showed reduced insulin gene expression, impaired insulin secretion, and glucose intolerance.
  • Loss of beta-cell function correlated with disrupted islet architecture.

Conclusions:

  • Nkx2.2 plays a critical role in maintaining mature beta-cell function and insulin secretion.
  • Nkx2.2 is essential for the structural integrity of pancreatic islets in adult mice.
  • These findings reveal a novel role for Nkx2.2 in postnatal beta-cell homeostasis.