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Visualization of Estrogen Receptors in Colons of Mice with TNBS-Induced Crohn's Disease using Immunofluorescence
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GPR30 contributes to estrogen-induced thymic atrophy.

Chunhe Wang1, Babak Dehghani, I Jack Magrisso

  • 1Neuroimmunology Research, Veterans Affairs Medical Center, Portland, Oregon 97239, USA. wangch@ohsu.edu

Molecular Endocrinology (Baltimore, Md.)
|December 8, 2007
PubMed
Summary

Prolonged estrogen exposure reduces thymus size. This study reveals estrogen receptor alpha (ERalpha) blocks thymocyte development, while G protein-coupled receptor 30 (GPR30) drives thymocyte death, clarifying estrogen

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Area of Science:

  • Immunology
  • Endocrinology
  • Molecular Biology

Background:

  • Prolonged estrogen exposure, including hormone therapy and pregnancy, is known to reduce thymus weight, cellularity, and T cell development.
  • The precise mechanisms and specific estrogen receptors involved in these estrogen-induced thymic changes remain poorly understood.

Purpose of the Study:

  • To elucidate the distinct roles of the membrane estrogen receptor, G protein-coupled receptor 30 (GPR30), and intracellular estrogen receptors alpha (ERalpha) and beta (ERbeta) in 17beta-estradiol (E2)-induced thymic atrophy.
  • To differentiate the contributions of these receptors in thymocyte development, apoptosis, and nuclear factor-kappa B (NF-κB) activation.

Main Methods:

  • Comparative analysis of GPR30-deficient mice alongside ERalpha and ERbeta gene-deficient mice.
  • Administration of 17beta-estradiol (E2) and a specific GPR30 agonist (G1) to assess thymic responses.
  • Flow cytometry analysis of thymocyte populations and assessment of NF-κB activation in specific thymocyte subsets.

Main Results:

  • Estrogen receptor alpha (ERalpha) exclusively mediates the early developmental blockage of thymocytes.
  • G protein-coupled receptor 30 (GPR30) is essential for thymocyte apoptosis, particularly in T cell receptor beta chain(-/low) double-positive thymocytes.
  • GPR30 activation by G1 induces thymic atrophy and apoptosis but does not affect thymocyte development; E2-induced NF-κB inhibition in double-negative thymocytes is ERalpha-dependent but independent of ERbeta and GPR30.

Conclusions:

  • Estrogen receptor alpha and G protein-coupled receptor 30 play distinct and critical roles in regulating thymic development and apoptosis.
  • ERalpha mediates developmental arrest, while GPR30 promotes thymocyte death, highlighting differential signaling pathways.
  • This study provides the first clear distinction between the roles of nuclear and membrane estrogen receptors in the negative regulation of thymic development.