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Related Experiment Videos

Free thyroid hormone concentrations during postnatal development in the rat

P Walker, J D Dubois, J H Dussault

    Pediatric Research
    |March 1, 1980
    PubMed
    Summary

    Thyroid hormone levels in developing rats show distinct patterns, with free thyroxine (FT4) stabilizing early and free triiodothyronine (FT3) peaking later. Pituitary-thyroid axis maturation occurs, with potential setpoint changes around weaning.

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    Area of Science:

    • Endocrinology
    • Developmental Biology
    • Physiology

    Background:

    • Thyroid hormones are crucial for mammalian development and metabolism.
    • Understanding the developmental trajectory of thyroid hormones and their regulatory mechanisms is essential.

    Purpose of the Study:

    • To characterize the developmental profiles of serum-free thyroxine (FT4) and free triiodothyronine (FT3) in Sprague-Dawley rats.
    • To assess the maturation of the pituitary-thyroid axis feedback control during postnatal development.

    Main Methods:

    • Sprague-Dawley rats were studied at various ages from 5 days to 40 days, including adults.
    • Serum concentrations and percentages of FT4 and FT3 were measured.
    • Ratios of FT4/TSH and FT3/TSH were calculated to assess feedback control.

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    Main Results:

    • Serum FT4 concentrations rapidly increased by 12 days, reaching adult levels, while FT3 concentrations progressively rose to peak at 26 days before declining.
    • The FT4/TSH and FT3/TSH ratios increased through 22 days, indicating progressive maturation of the pituitary-thyroid axis.
    • Further increases in FT3-related ratios up to 26 days suggest a potential setpoint reset, possibly linked to weaning stress.

    Conclusions:

    • Free thyroid hormone concentrations in rats exhibit distinct developmental patterns, mirroring total thyroid hormone profiles.
    • The negative feedback of the pituitary-thyroid axis matures significantly by 14 days of age.
    • A later adjustment in the pituitary-thyroid axis setpoint may occur around weaning, influencing FT3 regulation.