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Related Experiment Videos

7 alpha-hydroxy-dehydroepiandrosterone and immune response.

R Morfin1, P Lafaye, A C Cotillon

  • 1Laboratoire de Biotechnologie, Conservatoire National des Arts et Métiers, 2 rue Conté, 75003 Paris, France. morfin@cnam.fr

Annals of the New York Academy of Sciences
|March 28, 2001
PubMed
Summary

Steroid hydroxylation in lymphoid organs impacts immune responses. Differences in cytochrome P4507B1 activity between species affect how 7 alpha-hydroxysteroids influence antibody production.

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Area of Science:

  • Immunology
  • Endocrinology
  • Biochemistry

Background:

  • Circulating 3 beta-hydroxysteroids like pregnenolone (PREG), dehydroepiandrosterone (DHEA), and epiandrosterone (EPIA) are metabolized in lymphoid organs.
  • Cytochrome P4507B1, found in the hippocampus, is identified as the enzyme responsible for 7 alpha-hydroxylation of these steroids.

Purpose of the Study:

  • To investigate the patterns of 3 beta-hydroxysteroid 7 alpha-hydroxylation in human and murine lymphoid organs.
  • To determine the effect of different 7 alpha-hydroxysteroids on B and T cell immune responses.
  • To explore the role of P4507B1 sequence variations in interspecies differences in steroid metabolism and immune response.

Main Methods:

  • Analysis of 7 alpha-hydroxylation patterns of PREG, DHEA, and EPIA in human and mouse lymphoid tissues.

Related Experiment Videos

  • In vitro culture of activated human tonsil B + T cells and mouse lymphoid cells.
  • Measurement of IgG production against tetanus toxoid and Bordetella pertussis toxins.
  • Comparison of P4507B1 amino acid sequences across species.

    • Main Results:

    • Human and mouse lymphoid organs exhibited distinct 7 alpha-hydroxylation profiles, with absent PREG and EPIA hydroxylation in humans and mice, respectively.
    • 7 alpha-hydroxy-DHEA and 7 alpha-hydroxy-EPIA significantly enhanced IgG production in human B + T cell cultures.
    • 7 alpha-hydroxy-PREG and 7 alpha-hydroxy-DHEA boosted the immune response in mouse lymphoid cell cultures.
    • Paracrine action of 7 alpha-hydroxysteroids was observed due to their local production within lymphoid organs.
    • A single amino acid difference in P4507B1 was proposed to explain variations in enzyme kinetics (KM) and contribute to species-specific immune responses.

    Conclusions:

    • Cytochrome P4507B1-mediated 7 alpha-hydroxylation of steroids plays a role in modulating immune responses in lymphoid organs.
    • Species-specific differences in P4507B1 activity and substrate preference influence the impact of hydroxysteroids on antibody production.
    • Structural variations in P4507B1 may underlie differential immune system modulation by hydroxysteroids across species.