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[Bimodal secretion of thyroid hormones]

C Simon, R Miquelis

Comptes Rendus Hebdomadaires Des Seances De L'Academie Des Sciences. Serie D: Sciences Naturelles

|November 24, 1975

Summary

Iodine intake in rats reveals a dual hormonal secretion pattern. A delayed, larger secretion flux, likely due to thyroglobulin diffusion, dominates over immediate release.

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Area of Science:

Endocrinology
Thyroid Physiology

Background:

Thyroid hormones are crucial for metabolism.
Understanding thyroid hormone secretion dynamics is essential.

Purpose of the Study:

To investigate the turnover curve of plasmatic hormones in rats with daily iodine intake.
To elucidate the mechanisms of hormonal secretion.

Main Methods:

Rats were administered 50 mug of iodine daily.
Plasmatic hormone turnover was analyzed.

Main Results:

Hormonal secretion exhibited a bimodal turnover curve.
Two distinct secretion fluxes were identified: direct and delayed.
The delayed flux was approximately twenty times larger than the direct flux.

Conclusions:

Hormonal secretion involves both immediate and delayed release mechanisms.
The delayed secretion is likely influenced by thyroglobulin diffusion into the colloid.
Iodine intake significantly impacts thyroid hormone secretion patterns.

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