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Updated: May 10, 2026
Indirect Immunofluorescence on Frozen Sections of Mouse Mammary Gland
Published on: December 1, 2015
Expression of miR-206 during the initiation of mammary gland development
Min-Jung Lee1, Kyung-Sik Yoon, Kyoung-Won Cho
1Division in Anatomy and Developmental Biology, Department of Oral Biology, Brain Korea 21 Project, Oral Science Research Center, College of Dentistry, Yonsei Center of Biotechnology, Yonsei University, 50 Yonsei-ro, Seodaemoon-Gu, Seoul, 120-752, Korea.
Abstract:
MicroRNAs (miRNAs) are a class of small noncoding RNAs that control gene expression by targeting mRNAs and triggering either translational repression or RNA degradation. The aberrant expression of miRNAs might be involved in human diseases, including cancer. The expression of miR-206 in estrogen receptor alpha (ER-α)-positive human breast cancer tissues is well known. However, the expression and regulation of miR-206 in the developing mammary gland has not yet been studied. To understand the effects of miR-206 on mammary gland development, we have profiled gene expression in scramble-transfected and miR-206-overexpressing developing mammary buds. The genes that are potentially regulated by miR-206 in the mammary epithelium and/or mesenchyme, such as Tachykinin1 and Gata3, are known to be breast cancer markers. The expression of Wnt, which is involved in gland positioning, and of the transcription factors Tbx3 and Lef1, which are essential for mammary gland development, changes after miR-206 overexpression. Using a mammary bud in vitro culture system, we have demonstrated that miR-206 acts downstream of ER-α during mammary gland growth. Thus, miR-206 might be a novel candidate for morphogenesis during the initiation of mammary gland formation and the regulation of genes related to mammary gland development and breast cancer.
Insights
MicroRNAs (miRNAs) regulate gene expression and are implicated in cancer. This study reveals miR-206
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- MicroRNAs (miRNAs) are small noncoding RNAs regulating gene expression.
- Aberrant miRNA expression is linked to human diseases, including cancer.
- miR-206 is known in ER-α-positive breast cancer, but its role in mammary gland development is unstudied.
Purpose of the Study:
- To investigate the role and regulation of miR-206 in mammary gland development.
- To identify genes regulated by miR-206 during mammary gland morphogenesis.
- To understand miR-206's relationship with estrogen receptor alpha (ER-α).
Main Methods:
- Gene expression profiling in scramble-transfected vs. miR-206-overexpressing mammary buds.
- In vitro culture of mammary buds.
- Analysis of key developmental and cancer-related gene expression (e.g., Tachykinin1, Gata3, Wnt, Tbx3, Lef1).
Main Results:
- miR-206 overexpression alters expression of genes like Tachykinin1, Gata3, Wnt, Tbx3, and Lef1.
- These regulated genes are involved in mammary gland development and cancer.
- miR-206 functions downstream of ER-α in mammary gland growth.
Conclusions:
- miR-206 plays a role in mammary gland morphogenesis and development.
- miR-206 is a potential regulator of genes relevant to both mammary gland development and breast cancer.
- miR-206 may be a novel candidate for understanding mammary gland formation and associated diseases.
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