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Analysis of estrogen-regulated genes in mouse uterus using cDNA microarray and laser capture microdissection
Seok Ho Hong1, Hee Young Nah, Ji Yoon Lee
1Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 133-791, Korea.
Abstract:
The steroid hormone, estrogen, plays an important role in various physiological events which are mediated via its nuclear estrogen receptors, ERalpha and ERbeta. However, the molecular mechanisms that are regulated by estrogen in the uterus remain largely unknown. To identify genes that are regulated by estrogen, the ovariectomized mouse uterus was exposed to 17beta-estradiol (E2) for 6 h and 12 h, and the data were analyzed by cDNA microarray. The present study confirms previous findings and identifies several genes with expressions not previously known to be influenced by estrogen. These genes include small proline-rich protein 2A, receptor-activity-modifying protein 3, inhibitor of DNA binding-1, eukaryotic translation initiation factor 2, cystatin B, decorin, secreted frizzled-related protein 2, integral membrane protein 2B and chemokine ligand 12. The expression patterns of several selected genes identified by the microarray analysis were confirmed by RT-PCR. In addition, laser capture microdissection (LCM) was conducted to determine the expression of selected genes in specific uterine cell types. Analysis of early and late responsive genes using LCM and cDNA microarray not only suggests direct and indirect effects of E2 on uterine physiological events, but also demonstrates differential regulation of E2 in specific uterine cell types. These results provide a basic background on global gene alterations or genetic pathways in the uterus during the estrous cycle and the implantation period.
Insights
Estrogen regulates uterine gene expression through its receptors. This study identified novel estrogen-responsive genes in the mouse uterus, revealing cell-specific regulation and providing insights into uterine physiology.
Area of Science:
- Reproductive Biology
- Molecular Endocrinology
- Genomics
Background:
- Estrogen is a critical steroid hormone regulating numerous physiological processes via nuclear estrogen receptors (ERalpha and ERbeta).
- The precise molecular mechanisms underlying estrogen's regulation of the uterus are not fully understood.
- Identifying estrogen-regulated genes is crucial for understanding uterine function.
Purpose of the Study:
- To identify novel genes regulated by estrogen in the mouse uterus.
- To investigate the temporal and cell-specific effects of estrogen on uterine gene expression.
- To elucidate the molecular pathways influenced by estrogen in uterine tissues.
Main Methods:
- Ovariectomized mouse uteri were treated with 17beta-estradiol (E2) for 6 and 12 hours.
- Gene expression profiling was performed using cDNA microarray analysis.
- Quantitative validation of selected genes was conducted using RT-PCR.
- Laser capture microdissection (LCM) was employed to analyze gene expression in specific uterine cell types.
Main Results:
- The study confirmed known estrogen-regulated genes and identified several novel genes influenced by estrogen.
- Identified genes include small proline-rich protein 2A, receptor-activity-modifying protein 3, inhibitor of DNA binding-1, and chemokine ligand 12.
- Analysis revealed differential regulation of gene expression by E2 in specific uterine cell types, suggesting direct and indirect effects.
Conclusions:
- Estrogen exerts both direct and indirect effects on uterine physiology through the regulation of a broad spectrum of genes.
- Estrogen's regulatory actions are cell-type specific within the uterus.
- These findings provide a foundation for understanding global gene alterations and genetic pathways in the uterus during the estrous cycle and implantation.
