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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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HIF1α and pancreatic β-cell development.

Mylène Heinis1, Andrea Soggia, Camille Bechetoille

  • 1Institut National de Santé et de Recherche Médicale (INSERM) U845, Research Center Growth and Signalling, Université Paris Descartes, Sorbonne Paris Cité, Faculté de Médecine, Paris, France.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|March 20, 2012
PubMed
Summary

Low oxygen levels control pancreas development via hypoxia-inducible factor 1-alpha (HIF1α). This factor negatively regulates beta-cell differentiation, a crucial process for pancreatic function.

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Area of Science:

  • Developmental Biology
  • Endocrinology
  • Cell Biology

Background:

  • Pancreatic beta-cell development is sensitive to oxygen levels.
  • Hypoxia-inducible factor 1-alpha (HIF1α) is a key regulator of cellular responses to low oxygen.
  • Previous studies suggest oxygen tension controls beta-cell development.

Purpose of the Study:

  • To investigate the role of HIF1α in oxygen-mediated control of beta-cell differentiation.
  • To determine if oxygen's effect on pancreas development is conserved across species.
  • To elucidate the mechanism by which oxygen influences beta-cell development.

Main Methods:

  • In vitro studies on beta-cell differentiation under varying oxygen levels.
  • Comparative analysis of pancreas development in mouse and human fetal tissues.
  • Pharmacological inhibition and genetic manipulation (Vhl gene deletion) of HIF1α.

Main Results:

  • Oxygen tension controls beta-cell differentiation independently of epithelial-mesenchymal interactions, oxidative, or energetic stress.
  • Increased oxygen induced beta-cell differentiation in mouse and human fetal pancreas.
  • HIF1α inhibition at low oxygen increased progenitor cells, while HIF1α stabilization decreased beta-cell development.

Conclusions:

  • HIF1α plays a critical role in mediating the effects of oxygen on beta-cell differentiation.
  • HIF1α exerts a negative control over beta-cell differentiation during pancreatic development.
  • Oxygen tension and HIF1α are essential regulators of pancreatic beta-cell development across species.