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Plasma somatostatin is elevated in primary hypothyroidism compared with hyperthyroidism.

S Skare, K F Hanssen, N Norman

Acta Endocrinologica

|March 1, 1986

Summary

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Plasma somatostatin (SRIF) is elevated in patients with hypothyroidism compared to hyperthyroidism. This study investigated SRIF levels in thyroid disease patients, finding higher SRIF in hypothyroid individuals.

Area of Science:

Endocrinology
Metabolic Research

Background:

Pancreatic somatostatin (somatotrophin release inhibiting factor - SRIF) levels are elevated in hypothyroid rats.
Thyroid hormones significantly influence various metabolic processes and hormone regulation.

Purpose of the Study:

To investigate and compare plasma SRIF levels in patients with hypothyroidism and hyperthyroidism.
To explore the relationship between thyroid status and SRIF regulation.

Main Methods:

Plasma SRIF levels were measured in patients with autoimmune hypothyroidism and Graves' disease.
Arginine infusion was used to stimulate SRIF release and assess dynamic changes.
Measurements included plasma SRIF, serum insulin, plasma glucagon, serum growth hormone (GH), and blood glucose.

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Main Results:

Plasma SRIF levels were significantly higher in hypothyroid patients compared to hyperthyroid patients.
Hypothyroid patients exhibited higher serum insulin values during arginine stimulation.
No significant differences were observed in plasma glucagon, serum GH, or blood glucose between the groups.

Conclusions:

Primary hypothyroidism is associated with elevated plasma SRIF levels compared to hyperthyroidism.
A potential explanation for increased SRIF is reduced SRIF clearance in hypothyroidism.
The findings may relate to altered glucose tolerance observed in hyperthyroidism.