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Related Experiment Videos

Estradiol regulates estrogen receptor mRNA stability

M Saceda1, R K Lindsey, H Solomon

  • 1Department of Biochemistry and Molecular Biology, Vincent T. Lombardi Cancer Research Center, Georgetown University, Washington, DC 20007, USA.

The Journal of Steroid Biochemistry and Molecular Biology
|August 27, 1998
PubMed
Summary

Estradiol treatment reduces estrogen receptor mRNA stability by decreasing its half-life. This occurs due to an estrogen-regulated nuclease activity associated with ribosomes, impacting gene expression.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Endocrinology

Background:

  • Post-transcriptional regulation is crucial for estrogen receptor (ER) expression.
  • Estrogen signaling pathways involve complex regulatory mechanisms.

Purpose of the Study:

  • To investigate the role of post-transcriptional modifications in estrogen-induced loss of estrogen receptor expression.
  • To elucidate the mechanism by which estradiol affects estrogen receptor mRNA stability.

Main Methods:

  • Utilized translational inhibitors (pactamycin, puromycin, cycloheximide) to assess protein synthesis role.
  • Analyzed estrogen receptor mRNA association with polyribosomes.
  • Performed in vitro mRNA degradation assays using isolated polyribosomes.

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Main Results:

  • Estradiol treatment decreased estrogen receptor mRNA half-life from 4 hours to 40 minutes.
  • Pactamycin and puromycin, but not cycloheximide, blocked estradiol's effect on mRNA stability.
  • Estradiol treatment reduced ER mRNA associated with polyribosomes and increased degradation rates.

Conclusions:

  • Estrogen receptor mRNA stability is regulated by an estrogen-induced nuclease activity linked to ribosomes.
  • This mechanism contributes to the post-transcriptional control of estrogen receptor expression.