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Intra-islet regulation.

E Samols1, J I Stagner

  • 1Research Service, Veterans Administration Medical Center, Louisville, Kentucky 40202.

The American Journal of Medicine
|November 28, 1988
PubMed
Summary
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This study reveals a directed microvascular flow within pancreatic islets, where insulin from B cells regulates glucagon secretion. This finding explains abnormal glucagon secretion in diabetes due to insufficient intra-islet insulin.

Area of Science:

  • Endocrinology
  • Microcirculation
  • Pancreatic Islet Biology

Background:

  • Intra-islet cell communication is crucial for glucose homeostasis.
  • Two potential routes for cell-to-cell regulation exist: paracrine and direct microvascular perfusion.
  • The role of microvascular perfusion in intra-islet regulation remained largely unproven.

Purpose of the Study:

  • To investigate the functional significance of direct cellular perfusion through the islet microvasculature.
  • To determine the directionality and sequence of cell perfusion within pancreatic islets.
  • To elucidate the role of microvascular insulin in regulating glucagon secretion.

Main Methods:

  • In vitro perfusion of rat pancreases using anterograde and retrograde techniques.

Related Experiment Videos

  • Infusion of specific antibodies (anti-insulin, anti-somatostatin, anti-glucagon) to block specific hormones.
  • Measurement of changes in insulin, glucagon, and somatostatin secretion in response to antibody infusions.

    • Main Results:

    • Anterograde insulin antibody infusion increased glucagon and somatostatin secretion, while retrograde infusion had no effect.
    • Retrograde somatostatin antibody infusion increased both insulin and glucagon secretion.
    • Antiglucagon antibodies demonstrated differential effects on insulin and somatostatin secretion depending on infusion direction.
    • Established a directed microvascular perfusion sequence: B cells → A cells → D cells.

    Conclusions:

    • The pancreatic islet microvasculature exhibits a directed flow, influencing cell-to-cell communication.
    • Insulin secreted by B cells, acting via microvascular perfusion, is a primary inhibitor of glucagon secretion.
    • Deficiencies in intra-islet microvascular insulin are proposed as the cause of abnormal glucagon secretion in diabetes mellitus.