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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 is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
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Glucose-induced cyclic AMP oscillations regulate pulsatile insulin secretion.

Oleg Dyachok1, Olof Idevall-Hagren, Jenny Sågetorp

  • 1Department of Medical Cell Biology, Uppsala University, Biomedical Centre, Box 571, SE-751 23 Uppsala, Sweden.

Cell Metabolism
|July 2, 2008
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Summary

Glucose metabolism directly controls cyclic AMP (cAMP) levels in beta cells. Glucose-induced cAMP oscillations regulate the timing and amount of insulin secretion, impacting diabetes research.

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Area of Science:

  • Cellular biology
  • Endocrinology
  • Metabolic signaling

Background:

  • Cyclic AMP (cAMP) and calcium ions (Ca2+) are critical regulators of exocytosis.
  • Glucose-stimulated insulin secretion in beta cells is pulsatile, involving cytoplasmic Ca2+ oscillations.
  • The precise kinetics of cAMP signaling in this process remain largely uncharacterized.

Purpose of the Study:

  • To investigate the role and kinetics of cAMP signaling in glucose-stimulated insulin secretion.
  • To determine how cellular metabolism influences cAMP levels and insulin release.
  • To elucidate the relationship between cAMP oscillations and pulsatile insulin secretion.

Main Methods:

  • Evanescent-wave fluorescence imaging of single MIN6 cells and primary mouse beta cells.
  • Measurement of cytoplasmic Ca2+ concentration ([Ca2+]i) and cAMP levels.
  • Assessment of insulin release under various metabolic and signaling conditions.

Main Results:

  • Glucose induced pronounced submembrane cAMP oscillations in beta cells, preceded and enhanced by [Ca2+]i elevations.
  • Elevated cytoplasmic ATP levels triggered cAMP increases independently of [Ca2+]i rises, suggesting substrate-dependent adenylyl cyclase activity.
  • cAMP oscillations correlated directly with pulsatile insulin release; elevated cAMP enhanced secretion, while adenylyl cyclase inhibition suppressed both.

Conclusions:

  • Cellular metabolism directly controls cAMP levels in beta cells.
  • Glucose-induced cAMP oscillations are a key mechanism regulating the magnitude and kinetics of insulin exocytosis.
  • This signaling pathway is crucial for understanding beta cell function and insulin secretion dynamics.