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Related Experiment Videos

Glucose uptake, utilization, and signaling in GLUT2-null islets.

M T Guillam1, P Dupraz, B Thorens

  • 1Institute of Pharmacology and Toxicology, University of Lausanne, Switzerland.

Diabetes
|September 2, 2000
PubMed
Summary

Glucose transporter 2 (GLUT2) is crucial for pancreatic beta-cell function. Its absence impairs glucose-stimulated insulin secretion and biosynthesis, highlighting GLUT2

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Area of Science:

  • Metabolism
  • Endocrinology
  • Molecular Biology

Background:

  • Pancreatic beta-cells regulate glucose homeostasis via glucose-stimulated insulin secretion (GSIS).
  • GLUT2 is a primary glucose transporter in beta-cells, but its exact role in GSIS phases and biosynthesis is debated.
  • Previous work showed GLUT2-null beta-cells retain a second phase of GSIS dependent on glucose metabolism.

Purpose of the Study:

  • To investigate the role of GLUT2 in glucose uptake, utilization, and insulin secretion/biosynthesis in pancreatic beta-cells.
  • To determine if other glucose transporters (GLUT1, GLUT3) compensate for GLUT2 absence.
  • To confirm the necessity of GLUT2 for normal GSIS and insulin gene expression.

Main Methods:

  • Analysis of glucose transporter and glucokinase expression in GLUT2-null mouse islets.
  • Measurement of glucose utilization and GSIS in isolated islets.
  • Assessment of insulin and total protein biosynthesis.
  • Restoration of GLUT2 expression in GLUT2-null beta-cells using lentiviral vectors.

Main Results:

  • No compensatory upregulation of GLUT1 or GLUT3 was observed in GLUT2-null islets; glucokinase levels remained normal.
  • GLUT2-null islets showed impaired glucose utilization and significantly blunted GSIS, particularly at lower glucose concentrations.
  • Glucose-stimulated insulin and protein biosynthesis were markedly reduced in the absence of GLUT2.
  • Re-expression of GLUT2 restored normal GSIS, confirming its essential role.

Conclusions:

  • While low-level glucose uptake occurs in GLUT2-null beta-cells, it is insufficient for normal glucose sensing and signaling.
  • GLUT2 is indispensable for efficient glucose utilization, insulin secretion, and biosynthesis in murine pancreatic beta-cells.
  • The data underscore GLUT2's critical function in mediating glucose-driven insulin release and production.

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