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Pregna-D'-pentarane structure influences progesterone receptor affinity for DNA
T A Shchelkunova1, P M Rubtsov, I S Levina
1Lab. of Endocrinology, School of Biology, Moscow Lomonosov State University, Lenin Hills 1/12, 119899 Moscow, Russia.
Steroids
|April 18, 2002
Summary
Pregnenolone derivatives
Area of Science:
- Endocrinology
- Molecular Biology
- Genetics
Background:
- The progesterone receptor (PR) plays a crucial role in regulating gene expression.
- Understanding ligand-PR interactions is key to developing targeted therapies.
Purpose of the Study:
- To investigate the binding affinity of pregnenolone derivatives to the progesterone receptor.
- To determine how these compounds affect PR binding to hormone response elements (HREs).
Main Methods:
- Electrophoretic mobility shift assay (EMSA) was employed.
- PR from rat uterine cytosol was used.
- Oligonucleotide duplexes containing HREs were synthesized.
Main Results:
- PR binding to HRE-DNA was dependent on progesterone-related ligands, temperature, and PR concentration.
- RU486, a partial agonist/antagonist, showed the highest PR-DNA binding affinity.
- Full agonists generally exhibited lower PR-DNA binding affinity, with some exceptions.
Conclusions:
- Pregnenolone derivatives modulate progesterone receptor binding affinity to DNA.
- Ligand structure and agonistic/antagonistic activity influence PR-HRE interaction strength.
- These findings contribute to understanding PR-mediated gene regulation.
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