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Estrogen receptor-alpha gene expression in the cortex: sex differences during development and in adulthood
Melinda E Wilson1, Jenne M Westberry, Amanda L Trout
1Department of Physiology, College of Medicine, University of Kentucky, Lexington, KY 40536, USA. melinda.wilson@uky.edu
Hormones and Behavior
|August 18, 2010
Summary
17β-estradiol is crucial for brain development and function, acting via estrogen receptors (ERα and ERβ). Its gene expression in the brain is regulated by DNA methylation, particularly ERα, in a sex-dependent manner.
Area of Science:
- Neuroscience
- Molecular Biology
- Epigenetics
Background:
- 17β-estradiol influences brain development and function through estrogen receptors (ERα and ERβ).
- Estrogen receptor expression, particularly ERα, is high in early life and declines during puberty in the rodent brain.
- DNA methylation is a key epigenetic mechanism for regulating gene expression, including ERα.
Purpose of the Study:
- To investigate the molecular mechanisms regulating estrogen receptor alpha (ERα) gene expression during development and in the adult brain.
- To understand the role of DNA methylation in the developmental decline and injury-induced changes of ERα expression.
- To explore the sex-dependent regulation of ERα gene expression in the adult cortex.
Main Methods:
- Analysis of ERα mRNA expression levels during rodent brain development.
- Assessment of DNA methylation in ERα promoter regions during development and after neuronal injury (MCAO).
- Comparison of ERα expression and methylation patterns between male and female rodents.
Main Results:
- ERα mRNA expression decreases during rodent brain development, accompanied by increased promoter methylation.
- Following MCAO in adult female rodents, ERα expression increases, correlating with decreased promoter methylation.
- ERα expression changes following MCAO are sex-dependent, with males showing different responses.
Conclusions:
- ERα gene expression in the rodent cortex is regulated by DNA methylation during development and in adulthood.
- DNA methylation plays a critical role in the developmental silencing and injury-induced reactivation of ERα expression.
- ERα gene regulation in the adult brain is sex-dependent, highlighting distinct neuroprotective mechanisms.
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