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Related Experiment Videos

Plasma steroid-binding proteins.

W Rosner1

  • 1Columbia University, College of Physicians and Surgeons, New York, New York.

Endocrinology and Metabolism Clinics of North America
|December 1, 1991
PubMed
Summary
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Corticosteroid-binding globulin (CBG) and sex hormone-binding globulin (SHBG) regulate hormone levels and cell activity. Unliganded SHBG binds to cell receptors, triggering cAMP production when steroids are present.

Area of Science:

  • Endocrinology
  • Molecular Biology
  • Biochemistry

Background:

  • Plasma contains corticosteroid-binding globulin (CBG) and sex hormone-binding globulin (SHBG), crucial for regulating free hormone concentrations.
  • CBG controls free cortisol and progesterone, while SHBG modulates free testosterone, dihydrotestosterone, and estradiol levels.
  • The unbound, free fraction of hormones is biologically active and mediates hormonal effects.

Purpose of the Study:

  • To investigate the physiological functions and cellular interactions of CBG and SHBG.
  • To explore the role of steroid binding in the receptor interactions of SHBG and CBG.
  • To elucidate the signaling pathways activated by SHBG and CBG binding to cell receptors.

Main Methods:

  • Review of existing literature on steroid-binding proteins.

Related Experiment Videos

  • Analysis of the binding characteristics of SHBG and CBG to their respective hormones and cell receptors.
  • Examination of cellular responses, including adenylate cyclase activity and cAMP accumulation, upon protein-receptor interaction.

    • Main Results:

    • SHBG and CBG are major determinants of free hormone concentrations, influencing hormonal action.
    • Both proteins possess high-affinity receptors on cell membranes; only unliganded SHBG binds to its receptor.
    • Steroid presence during protein-receptor binding triggers rapid adenylate cyclase activation and cAMP production.
    • CBG is identified as a serine proteinase inhibitor, releasing bound cortisol upon cleavage by serine proteases.

    Conclusions:

    • SHBG and CBG play multifaceted roles beyond hormone transport, including direct cellular signaling.
    • The binding of unliganded SHBG to cell receptors initiates intracellular signaling cascades.
    • CBG's function as a serine proteinase inhibitor adds another layer to its physiological relevance, particularly in cortisol release.