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Cytosolic thyroxine-binding protein and brain development.

A M Lennon, J Osty, J Nunez

    Molecular and Cellular Endocrinology
    |June 1, 1980
    PubMed
    Summary
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    Rat brain contains a specific cytosolic thyroxine-binding protein, similar to liver. Its binding affinity remains constant during development, but binding sites decrease significantly in both cortex and cerebellum postnatally.

    Area of Science:

    • Neuroscience
    • Endocrinology
    • Biochemistry

    Background:

    • Thyroid hormones are crucial for brain development.
    • Cytosolic thyroxine-binding protein (CTBP) plays a role in thyroid hormone transport and metabolism.
    • Understanding CTBP in the brain is essential for comprehending thyroid hormone action during development.

    Purpose of the Study:

    • To characterize the properties of CTBP in the rat brain cortex and cerebellum during postnatal development.
    • To investigate the developmental changes in CTBP's binding affinity and site concentration.
    • To compare CTBP characteristics between the cortex and cerebellum.

    Main Methods:

    • Polyacrylamide-gel electrophoresis for protein identification and mobility analysis.
    • Kinetic analysis to determine binding equilibrium and saturation.

    Related Experiment Videos

  • Scatchard analysis to quantify binding affinity (K A) and binding site concentration.

    • Main Results:

    • Rat brain cortex and cerebellum possess a single CTBP, similar to the liver counterpart, with consistent electrophoretic mobility during development.
    • No specific triiodothyronine-binding component was detected.
    • Binding equilibrium reached within 10 minutes, with saturation at approximately 5 x 10(-7) M thyroxine.
    • A single class of thyroxine-binding sites with a K A of approximately 8 x 10(7) M-1 was identified.
    • Binding affinity (K A) remained constant from postnatal day 3 to 35 in both regions.
    • The number of binding sites significantly decreased in the cortex (2-fold) and even more markedly in the cerebellum by adulthood.
    • The cerebellum exhibited approximately half the binding sites compared to the cortex at all developmental stages studied.

    Conclusions:

    • Rat brain CTBP is a stable protein throughout postnatal development with consistent thyroxine-binding affinity.
    • A significant developmental decline in CTBP binding sites occurs in both cortex and cerebellum, suggesting altered thyroid hormone regulation.
    • Cerebellar CTBP activity is lower than cortical activity, indicating regional differences in thyroid hormone handling.