Estradiol induces differential neuronal phenotypes by activating estrogen receptor alpha or beta

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C Patrone1, G Pollio, E Vegeto

  • 1Center Milano Molecular Pharmacology Lab, Institute of Pharmacological Sciences, University of Milan, Italy.

Endocrinology
|May 10, 2000
PubMed

Insights

Estrogen receptors alpha and beta (ERalpha and ERbeta) mediate distinct cellular responses. ERalpha promotes neurite sprouting and elongation, while ERbeta only affects elongation, highlighting subtype-specific estrogen signaling.

Area of Science:

  • Neuroendocrinology
  • Molecular Endocrinology
  • Cell Biology

Background:

  • Estrogens exert diverse effects via estrogen receptors alpha (ERalpha) and beta (ERbeta).
  • The distinct functional roles of ERalpha and ERbeta in target cells remain incompletely understood.
  • Estrogen-mediated neurite sprouting is a key effect in neural cells.

Purpose of the Study:

  • To investigate the differential effects of ERalpha and ERbeta activation on neurite sprouting in neural cells.
  • To elucidate the molecular mechanisms underlying subtype-specific estrogen signaling.

Main Methods:

  • Utilized SK-N-BE neuroblastoma cells transfected with ERalpha or ERbeta.
  • Examined 17beta-estradiol-dependent activation of ERalpha and ERbeta.
  • Employed chimeric receptors to identify critical functional domains.
  • Assessed the role of the small G protein Rac1B in ER-mediated effects.

Main Results:

  • 17beta-estradiol induced distinct morphological phenotypes dependent on the ER subtype.
  • ERalpha activation increased both neurite length and number.
  • ERbeta activation modulated only neurite elongation.
  • Chimeric receptor analysis revealed the necessity of both NH2-terminal and COOH-terminal transcription activation functions for differential activity.
  • ERalpha-dependent morphological changes required the active form of Rac1B, whereas ERbeta-dependent changes did not.

Conclusions:

  • ERalpha and ERbeta mediate distinct biological roles in estrogen target cells.
  • 17beta-estradiol activates specific intracellular signaling pathways based on the bound receptor subtype.
  • These findings provide clear evidence for subtype-selective estrogen action in neural development and function.

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