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Modulation of androgen-responsive gene expression by estrogen
Molecular and Cellular Endocrinology
|August 1, 1992
Summary
Sex steroids (testosterone and estrogen) influence gene expression in mouse kidneys. Estrogen affects gene regulation at the transcriptional level and mRNA stability, impacting testosterone-responsive genes.
Area of Science:
- Endocrinology
- Molecular Biology
- Genetics
Background:
- Hormonal actions are often studied in isolation, but in vivo, multiple hormones interact.
- Understanding the interplay of sex steroids is crucial for comprehending gene regulation in intact organisms.
Purpose of the Study:
- To investigate the mutual influence of testosterone and estrogen on eight known testosterone-responsive genes in mouse kidneys.
- To elucidate the regulatory mechanisms underlying sex steroid-mediated gene expression.
Main Methods:
- Analysis of gene expression in mouse kidneys following exposure to different sex steroid conditions.
- Assessment of transcriptional regulation and mRNA stability.
- Investigation of androgen receptor localization.
Main Results:
- Estrogen exhibited varied responses on the targeted genes, distinct from testosterone's effects.
- Gene expression changes were primarily mediated by transcriptional regulation, with some evidence of altered mRNA stability.
- Estrogen did not influence the nuclear localization of the androgen receptor.
Conclusions:
- Genes in mouse kidneys can respond to the combined actions of both androgens and estrogens.
- The regulatory outcome for each gene is determined by its specific interaction with both androgen and estrogen receptor complexes.
- This highlights the complex, gene-specific nature of sex steroid hormone signaling.
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