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Related Experiment Videos

Thyroxine binding by hepatitis B surface antigen

A R Neurath, L Korcek, A M Prince

    The Journal of Infectious Diseases
    |February 1, 1975
    PubMed
    Summary
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    Hepatitis B surface antigen (HBsAg) particles possess binding sites for thyroid hormones like thyroxine. This discovery raises questions about the connection between thyroid function and HBsAg presence in the body.

    Area of Science:

    • Virology
    • Endocrinology
    • Biochemistry

    Background:

    • Hepatitis B surface antigen (HBsAg) is a key marker for Hepatitis B virus infection.
    • Thyroid hormones, including thyroxine and triiodothyronine, regulate numerous metabolic processes.
    • The interaction between viral antigens and host hormones is an area of ongoing research.

    Purpose of the Study:

    • To investigate the presence and characteristics of thyroid hormone binding sites on HBsAg particles.
    • To explore the structural changes in HBsAg upon thyroxine treatment.
    • To examine the potential relationship between thyroid status and HBsAg antigenemia.

    Main Methods:

    • Characterization of HBsAg particles using electron microscopy.
    • Determination of buoyant density of thyroxine-treated HBsAg in Cesium Chloride (CsCl) gradients.

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  • Analysis of thyroid hormone binding to HBsAg.

    • Main Results:

    • 20-nm spherical HBsAg particles exhibit binding sites for thyroxine and triiodothyronine.
    • Thyroxine-treated HBsAg displayed a buoyant density of 1.26 g/cm-3 in CsCl.
    • Electron microscopy revealed thyroxine-treated HBsAg as hexagonal particles with a 10 nm center-to-vertex distance.

    Conclusions:

    • HBsAg particles possess specific binding sites for thyroid hormones.
    • Thyroxine binding induces structural alterations in HBsAg particles.
    • Further research is warranted to understand the implications of thyroid hormone-HBsAg interactions in human health and disease.