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Related Experiment Videos

L-thyroxine enters the rat liver cell by simple diffusion.

G S Rao, M L Rao

    The Journal of Endocrinology
    |May 1, 1983
    PubMed
    Summary

    L-[125I]thyroxine uptake by rat liver cells occurs via simple diffusion, not a saturable process. Only the free hormone crosses the cell membrane, as indicated by reduced uptake in the presence of albumin.

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    Area of Science:

    • Biochemistry
    • Cell Biology
    • Endocrinology

    Background:

    • Thyroxine (T4) is a crucial thyroid hormone regulating metabolism.
    • Understanding the cellular uptake mechanisms of thyroid hormones is vital for comprehending their physiological effects.
    • Liver parenchymal cells are key sites for thyroid hormone metabolism and action.

    Purpose of the Study:

    • To investigate the mechanism of L-[125I]thyroxine uptake by freshly isolated rat liver parenchymal cells.
    • To determine if the uptake process is saturable and influenced by hormone concentration.
    • To assess the role of temperature and serum albumin on L-[125I]thyroxine uptake.

    Main Methods:

    • Utilized a rapid centrifugation technique to study initial rates of L-[125I]thyroxine uptake.
    • Incubated isolated rat liver cells with varying concentrations of L-[125I]thyroxine (2 pmol/l to 10 mumol/l).
    • Performed temperature-dependent uptake studies and assessed the effect of 2.8% bovine serum albumin on uptake.

    Main Results:

    • L-[125I]thyroxine uptake was not saturable across a wide range of hormone concentrations.
    • The Arrhenius plot was linear between 2 and 37 degrees C, with a temperature coefficient of 1.4.
    • Uptake of L-[125I]thyroxine was 35% of L-[125I]tri-iodothyronine uptake and reduced by 90% in the presence of bovine serum albumin.

    Conclusions:

    • The non-saturable uptake kinetics suggest that L-[125I]thyroxine enters rat liver parenchymal cells via simple diffusion.
    • The significant reduction in uptake by albumin indicates that only the free, unbound hormone is available for cellular entry.
    • These findings highlight the passive nature of thyroxine transport across the liver cell plasma membrane.

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