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Pulsatile insulin secretion by human pancreatic islets.

Soon H Song1, Lise Kjems, Robert Ritzel

  • 1Department of Pathology, University of Edinburgh, Edinburgh EH8 9YL, Scotland, UK.

The Journal of Clinical Endocrinology and Metabolism
|January 15, 2002
PubMed
Summary

Pulsatile insulin secretion from human islets was accurately measured using validated deconvolution analysis. This method enhances understanding of how glucose affects insulin pulse mass, not frequency, aiding diabetes research.

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Area of Science:

  • Endocrinology
  • Islet Biology
  • Hormone Secretion Dynamics

Background:

  • Insulin is secreted in pulsatile bursts, a pattern observed in vivo and in vitro.
  • Accurate measurement of pulsatile hormone secretion requires validated detection methods specific to the experimental setup.

Purpose of the Study:

  • To validate a deconvolution technique for detecting and quantifying pulsatile insulin release from perifused human islets.
  • To assess the sensitivity and specificity of deconvolution and cluster analysis for in vitro pulse detection.
  • To investigate the effect of glucose on the dynamics of insulin secretion from single human islets.

Main Methods:

  • Validation of an in vivo deconvolution technique for in vitro pulsatile insulin detection using human islets.
  • Comparison of deconvolution analysis with cluster analysis for pulse detection sensitivity and specificity.

Related Experiment Videos

  • Perifusion of single and multiple human islets to measure insulin release dynamics.

    • Main Results:

    • Deconvolution analysis reliably detected insulin pulses (>90% accuracy for amplitudes ≥20%) and quantitatively recovered secretion profiles.
    • Cluster analysis was less sensitive (detecting >80% of pulses with amplitudes ≥40%) and more suitable for groups than single islets.
    • Increased glucose enhanced insulin secretion by increasing pulse mass, not pulse frequency, in single human islets.
    • Interpulse intervals in perifused islets (approx. 6-8 min) matched in vivo observations.

    Conclusions:

    • Validated deconvolution analysis is a sensitive and accurate method for studying pulsatile insulin secretion from human islets in vitro.
    • In vitro perifusion systems, particularly with deconvolution analysis, are valuable tools for investigating the mechanisms of pulsatile insulin secretion.
    • Glucose stimulation primarily increases insulin pulse mass, offering insights into glucose-insulin homeostasis.