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Internal Receptors01:31

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Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.
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Detecting the Ligand-binding Domain Dimerization Activity of Estrogen Receptor Alpha Using the Mammalian Two-Hybrid Assay
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Membrane-localized estrogen receptor α is required for normal organ development and function.

Ali Pedram1, Mahnaz Razandi2, Michael Lewis3

  • 1Division of Endocrinology, Department of Medicine, University of California, Irvine, Irvine, CA 92717, USA.

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Extranuclear estrogen receptor alpha (ERα) signaling is essential for normal organ development. Membrane ERα collaborates with nuclear ERα to regulate crucial developmental pathways, as demonstrated in a novel mouse model.

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Developmental Biology

Background:

  • Steroid receptors, including estrogen receptor alpha (ERα), exist in various cellular compartments.
  • The necessity of extranuclear ERα pools for normal organ development remains largely uncharacterized.

Purpose of the Study:

  • To investigate the role of extranuclear ERα in organ development using a novel mouse model.
  • To determine if membrane-associated ERα signaling is critical for normal physiological functions.

Main Methods:

  • Development of a point mutant ERα knockin mouse (C451A) preventing palmitoylation and membrane trafficking.
  • Analysis of homozygous knockin female mice (nuclear-only ERα [NOER]) exhibiting loss of rapid membrane-initiated signaling.
  • Assessment of developmental phenotypes, reproductive capabilities, and estrogen-stimulated gene expression.

Main Results:

  • NOER mice displayed significant developmental abnormalities, including infertility, hypoplastic uteri, ovarian dysfunction, impaired mammary gland development, and altered pituitary hormone regulation.
  • These abnormalities were absent in heterozygous NOER mice, indicating a dose-dependent effect.
  • Estrogen-induced stimulation of key developmental mRNAs was severely impaired in homozygous NOER mice.

Conclusions:

  • Membrane-associated ERα signaling is indispensable for normal organ development and function.
  • Extranuclear ERα pools must collaborate with nuclear ERα to orchestrate complex developmental processes.
  • This study highlights the critical, previously underestimated, role of extranuclear steroid receptor signaling.