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Related Experiment Videos

Endocrine pancreatic function in pheochromocytoma.

N Sicolo1, G Federspil, C B De Palo

  • 1Cattedra di Pathologia Medica 3, Università di Padova, Italy.

Journal of Endocrinological Investigation
|March 1, 1991
PubMed
Summary

Pheochromocytoma, an adrenal tumor, can cause impaired glucose tolerance due to an inappropriate insulin response to glucose. Post-surgery, glucose tolerance may improve, suggesting a link between the tumor and metabolic dysfunction.

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Area of Science:

  • Endocrinology
  • Metabolic Disorders

Background:

  • Pheochromocytoma is a rare adrenal tumor causing excess catecholamine release.
  • These catecholamines can significantly impact glucose metabolism.
  • Understanding the specific mechanisms of glucose dysregulation in pheochromocytoma is crucial.

Purpose of the Study:

  • To investigate glucose tolerance and hormonal responses in patients with pheochromocytoma.
  • To determine the role of insulin and glucagon in glucose metabolism alterations associated with this adrenal tumor.
  • To assess changes in glucose metabolism following surgical removal of pheochromocytoma.

Main Methods:

  • Six patients with pheochromocytoma underwent oral glucose tolerance tests (OGTT) and arginine tests.
  • Blood glucose, insulin, and glucagon levels were monitored.

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  • Hormonal and glycemic responses were analyzed before and after surgical tumor resection in some patients.

    • Main Results:

    • Patients exhibited a characteristic glycemic curve: rapid rise followed by a sharp drop.
    • Absolute insulin response to oral glucose was normal but disproportionate to the glycemic stimulus.
    • Arginine infusion caused a mild increase in blood glucose and normal glucagon response.
    • Postoperatively, three patients showed a reduced glycemic response to glucose, with no significant changes in insulin or glucagon.

    Conclusions:

    • Impaired glucose tolerance in pheochromocytoma is partly attributed to an inadequate insulin secretion relative to the glucose load.
    • The adrenal tumor appears to play a direct role in altering glucose homeostasis.
    • Surgical intervention may lead to partial normalization of glucose tolerance.