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Related Experiment Videos

Dehydroepiandrosterone stimulates the estrogen response element

J M Bruder1, L Sobek, M Oettel

  • 1Department of Medicine, University of Texas Health Science Center, San Antonio 78284-7877, USA.

The Journal of Steroid Biochemistry and Molecular Biology
|August 1, 1997
PubMed
Summary

Dehydroepiandrosterone (DHEA) directly activates the estrogen response element (ERE) via the estrogen receptor (ER) in neuronal cells. This DHEA activity is independent of its conversion to estradiol, suggesting a novel direct signaling pathway.

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Area of Science:

  • Endocrinology
  • Neuroendocrinology
  • Molecular Endocrinology

Background:

  • Dehydroepiandrosterone (DHEA) is an abundant adrenal steroid with known indirect roles as an androgen and estrogen precursor.
  • Emerging evidence suggests DHEA may possess direct functional activities independent of its conversion to other steroids.
  • Understanding the direct actions of DHEA is crucial for elucidating its diverse physiological effects.

Purpose of the Study:

  • To investigate the direct functional activity of dehydroepiandrosterone (DHEA) on the classic estrogen response element (ERE).
  • To determine if DHEA can activate the estrogen receptor (ER) independently of its conversion to estradiol.
  • To explore the potential direct signaling role of DHEA in neuronal cells.

Main Methods:

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  • Transiently transfected GT1-7 hypothalamic neuronal cells (ER-negative) were utilized.
  • Cells were co-transfected with the estrogen receptor expression plasmid (HEGO) and an estrogen response element luciferase reporter vector (ERELUC).
  • Luciferase activity was measured following treatment with varying concentrations of estradiol and DHEA, and in the presence of receptor antagonists and aromatase inhibitors.

    • Main Results:

    • Estradiol treatment resulted in a dose-dependent increase in luciferase activity (136-195%).
    • DHEA also demonstrated a dose-dependent stimulation of luciferase activity, with a maximum increase of 177% at 10(-5) M.
    • Both estradiol- and DHEA-induced activities were inhibited by the ER antagonist ICI 182,780, and unaffected by the aromatase inhibitor formestane, confirming DHEA's direct action.
    • Estradiol levels were elevated by estradiol treatment but not significantly by DHEA treatment.

    Conclusions:

    • Dehydroepiandrosterone (DHEA) directly activates the estrogen response element (ERE) in the presence of the estrogen receptor (ER).
    • The observed effects of DHEA are independent of its aromatization to estradiol, indicating a distinct signaling mechanism.
    • These findings suggest a novel, direct in vitro functional role for DHEA in ER-mediated gene transcription within neuronal cells.