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Related Experiment Videos

Thyrotrophin binding glycoprotein isolated from bovine thyroid.

B Czarnocka, A Gardas, J Nauman

    Acta Endocrinologica
    |March 1, 1981
    PubMed
    Summary

    Researchers isolated thyrotrophin receptors from bovine thyroid membranes using butanol-water extraction. Purified glycoprotein fractions specifically inhibited [125I]TSH binding, indicating their role in thyrotropin receptor function.

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    Area of Science:

    • Endocrinology
    • Biochemistry
    • Molecular Biology

    Background:

    • Thyroid plasma membranes contain receptors for thyrotropin (TSH).
    • Solubilization and purification of these receptors are crucial for understanding thyroid function and related diseases.

    Purpose of the Study:

    • To solubilize and purify the thyrotropin receptor from bovine thyroid plasma membranes.
    • To characterize the purified receptor and assess its binding activity.

    Main Methods:

    • Butanol-water extraction of bovine thyroid plasma membranes.
    • Chromatography using DEAE-cellulose and AcA-54 Ultrogel for purification.
    • Radioiodinated TSH ([125I]TSH) binding assays to measure receptor activity.

    Main Results:

    • Butanol-water extraction solubilized 12% of membrane proteins and 40% of TSH binding capacity.
    • Purified fractions were identified as glycoproteins containing various sugars and sialic acid.
    • Micrograms of purified glycoproteins inhibited [125I]TSH binding by 50%, demonstrating specific interaction.

    Conclusions:

    • A functional thyrotropin receptor was successfully solubilized and purified from bovine thyroid membranes.
    • The purified receptor is a glycoprotein that specifically binds thyrotropin.
    • These findings provide a basis for further studies on thyroid-stimulating hormone receptor structure and function.

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