Circ-ABCA1 promotes breast cancer stem cell-mediated malignant progression by modulating miR-33a-5p/EIF4A3 axis

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Circular RNAs (circRNAs) are emerging as critical regulators in various cancers.
• Understanding the specific roles of circRNAs in breast cancer progression is essential for developing targeted therapies.

Purpose of the Study:

• To investigate the role of circ-ABCA1 in breast cancer progression.
• To elucidate the underlying molecular mechanisms, including its interaction with microRNAs and protein targets.

Main Methods:

• High-throughput sequencing to identify differentially expressed circRNAs.
• Fluorescence in situ hybridization (FISH) for expression and localization analysis.
• Bioinformatics, luciferase reporter assays, cell proliferation (CCK8, EdU), migration assays, and in vivo experiments.

Main Results:

• circ-ABCA1 expression is significantly upregulated in breast cancer tissues and cell lines.
• Downregulation of circ-ABCA1 inhibits breast cancer cell proliferation, migration, and tumor growth in vivo.
• circ-ABCA1 directly targets miR-33a-5p and regulates EIF4A3 expression, forming a regulatory axis.

Conclusions:

• circ-ABCA1 acts as an oncogenic circRNA in breast cancer.
• The circ-ABCA1/miR-33a-5p/EIF4A3 axis plays a crucial role in promoting breast cancer stem cell-mediated malignant progression.
• circ-ABCA1 represents a potential therapeutic target for breast cancer treatment.