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Peripheral and hepatic insulin antagonism in hyperthyroidism.

D C Shen1, M B Davidson, S W Kuo

  • 1Department of Medicine, Tri-Service General Hospital, Taipei, Taiwan, Republic of China.

The Journal of Clinical Endocrinology and Metabolism
|March 1, 1988
PubMed
Summary

Hyperthyroidism causes elevated insulin levels and increased hepatic glucose production, leading to insulin resistance in peripheral tissues. This study reveals significant insulin antagonism in hyperthyroid patients, impacting glucose metabolism.

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Area of Science:

  • Endocrinology
  • Metabolic Disorders
  • Human Physiology

Background:

  • Hyperthyroidism is associated with altered glucose metabolism.
  • The precise mechanisms of insulin resistance in hyperthyroidism require further elucidation.

Purpose of the Study:

  • To investigate peripheral and hepatic insulin antagonism in hyperthyroid individuals.
  • To quantify glucose production and utilization under varying insulin levels.

Main Methods:

  • Oral glucose tolerance tests (OGTT) and euglycemic clamp studies were performed on hyperthyroid and normal subjects.
  • Insulin sensitivity was assessed using Bergman's index.
  • Hepatic glucose production and peripheral glucose utilization were measured during clamp procedures.

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Main Results:

  • Hyperthyroid patients exhibited elevated insulin levels during OGTT and increased basal hepatic glucose production.
  • Impaired suppression of hepatic glucose production and reduced peripheral insulin action were observed in hyperthyroidism.
  • Insulin-stimulated glucose utilization was significantly lower in hyperthyroid subjects.

Conclusions:

  • Hyperthyroidism is characterized by hyperinsulinemia, increased basal hepatic glucose production, and impaired insulin suppression of hepatic glucose output.
  • Significant peripheral insulin antagonism contributes to glucose dysregulation in hyperthyroidism.