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Rapid extranuclear signaling by the estrogen receptor (ER): MNAR couples ER and Src to the MAP kinase signaling

Dean P Edwards1, Viroj Boonyaratanakornkit

  • 1Department of Pathology and Program in Molecular Biology, University of Colorado Health Sciences Center Denver, CO 80262, USA. Dean.Edwards@UCHSC.edu

Molecular Interventions
|March 3, 2004
PubMed

Insights

Estrogen receptors (ERs) have rapid, nongenomic effects. A newly identified protein, MNAR (modulator of nongenomic activity of estrogen receptor), acts as an adaptor linking ERs to key signaling pathways like Src and MAPK.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Endocrinology

Background:

  • Estrogen receptors (ERs) are known for gene transactivation.
  • ERs also mediate rapid cytoplasmic effects not explained by gene expression.
  • Identifying protein partners for these rapid, nongenomic ER effects has been challenging.

Purpose of the Study:

  • To identify protein partners involved in rapid, nongenomic estrogen receptor signaling.
  • To elucidate the role of identified proteins in bridging ERs with other signaling cascades.

Main Methods:

  • Protein interaction studies to identify novel ER-binding partners.
  • Investigating the role of identified partners in ER-mediated signaling pathways.
  • Analyzing the impact of these interactions on both nongenomic and genomic ER functions.

Main Results:

  • Identification of MNAR (modulator of nongenomic activity of estrogen receptor) as a key adaptor protein for ERs.
  • MNAR facilitates the connection between ERs and tyrosine kinase pathways, specifically Src.
  • The MNAR-ER complex also links to the mitogen-activated protein kinase (MAPK) cascade.
  • Evidence suggests the MNAR-ER complex enhances ER-mediated gene expression.

Conclusions:

  • MNAR is a crucial adaptor protein mediating rapid, nongenomic estrogen receptor signaling.
  • MNAR bridges ERs with Src and MAPK signaling pathways.
  • MNAR may also play a role in potentiating ER-mediated gene expression, linking genomic and nongenomic functions.

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