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Development of cDNA microarray for expression profiling of estrogen-responsive genes.

A Inoue¹, N Yoshida, Y Omoto

¹Division of Endocrinology, Saitama Cancer Center Research Institute, 818 Komuro, Ina-machi, Kitaadachi-gun, Saitama-ken 362-0806, Japan.

Journal of Molecular Endocrinology

|October 10, 2002

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This study identifies early and late estrogen-responsive genes in breast cancer cells, revealing key molecular mechanisms of estrogen signaling. Findings aid in understanding cancer development and predicting therapeutic responses.

Area of Science:

Molecular Biology
Genomics
Cancer Research

Background:

Estrogen is crucial in physiological processes, including carcinogenesis and breast cancer development.
The precise molecular mechanisms of estrogen signaling in cancers remain unclear, necessitating improved therapeutic prediction for breast cancer.

Purpose of the Study:

To elucidate estrogen-responsive gene expression profiles in breast cancer.
To identify early and late estrogen-responsive genes.
To analyze the effects of estrogen antagonists on gene expression and explore estrogen's role across various cancer types.

Main Methods:

Estrogen-responsive expression profiling of ~9000 genes in MCF-7 breast cancer cells.
Development and application of a custom cDNA microarray for detailed gene subset analysis.

Related Experiment Videos

Analysis of gene expression time courses, effects of estrogen antagonists (ICI 182780, 4-hydroxytamoxifen), and hierarchical clustering across multiple cancer cell lines.

Main Results:

Estrogen-responsive genes were categorized into early and late responders.
ICI 182780 abolished most estrogen-regulated genes, while 4-hydroxytamoxifen showed partial effects on some.
Estrogen influenced gene expression in cell lines beyond MCF-7, including those from ovarian and stomach cancers.

Conclusions:

Identified specific estrogen-responsive genes provide insights into cancer biology.
Understanding these gene expression patterns can contribute to more accurate therapeutic predictions in cancer treatment.
Estrogen signaling pathways show complex regulation and potential therapeutic targets across diverse cancer types.