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16:24
Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells
Published on: February 21, 2014
The changes of estrogen receptor-beta variants expression in breast carcinogenesis: Decrease of estrogen
Byeong-Woo Park1, Ki-Suk Kim, Min-Kyu Heo
1Department of Surgery, Yonsei University College of Medicine, Seodaemun-ku, Seoul, Korea. bwpark@yumc.yonsei.ac.kr
Journal of Surgical Oncology
|April 15, 2006
Summary
Estrogen receptor-beta (ERbeta) variant expression changes during breast cancer development. ERbeta2 decreases while ERbeta5 increases in cancer tissues, particularly in postmenopausal patients, indicating distinct roles in cancer progression.
Area of Science:
- Endocrinology
- Molecular Biology
- Oncology
Background:
- Over five estrogen receptor-beta (ERbeta) variant forms exist, but their specific roles remain unclear.
- Investigating ERbeta variant expression is crucial for understanding breast cancer development.
Purpose of the Study:
- To investigate the expression levels of ERbeta variants in breast cancer tissues.
- To correlate ERbeta variant expression with clinicopathological parameters.
Main Methods:
- Quantitative analysis of ERbeta variant mRNA using reverse transcription polymerase chain reaction (RT-PCR) and triple primer PCR (TP-PCR).
- Comparison of ERbeta variant expression between 66 paired normal and cancer breast tissues.
- Statistical analysis of expression levels against clinicopathological factors.
Main Results:
- ERbeta2 and ERbeta5 constitute the majority of ERbeta expression in both normal and cancerous tissues.
- ERbeta and ERbeta2 expression significantly decreased in cancer tissues, especially in ERalpha-positive cancers.
- ERbeta5 expression significantly increased in cancer tissues, particularly in postmenopausal women, and correlated with favorable differentiation.
Conclusions:
- A decrease in ERbeta2 expression is a key factor in the reduced ERbeta levels observed in breast cancer.
- The altered expression of ERbeta variants, particularly ERbeta2 and ERbeta5, is associated with breast cancer development and progression.
- ERbeta5 upregulation in cancer tissues may indicate a favorable prognostic marker, especially in postmenopausal patients.
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