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Analysis of Combinatorial miRNA Treatments to Regulate Cell Cycle and Angiogenesis
Published on: March 30, 2019
MiR-27a modulates radiosensitivity of triple-negative breast cancer (TNBC) cells by targeting CDC27
Yong-qiang Ren1, Fengkui Fu2, Jianjun Han3
1Clinical Laboratory, The Central Hospital of Yishui, Linyi, Shandong, China (mainland).
Background:
MiR-27a is significantly overexpressed in triple-negative breast cancer (TNBC). However, the exact biological function of MiR-27a in TNBC is not fully understood. In this study, we verified miR-27a expression in TNBC cells and explored how its overexpression modulates radiosensitivity of the cells.
Material/Methods:
qRT-PCR analysis was performed to study miR-27a expression in TNBC lines MDA-MB-435 and MDA-MB-231 and in normal human breast epithelial cell line MCF10A. Dual luciferase assay was performed to verify a putative downstream target of miR-27a, CDC27. CCK-8 assay was used to assess the influence of miR-27a-CDC27 axis on cell proliferation under irradiation (IR) treatment.
Results:
We confirmed significantly higher miR-27a expression in 2 TNBC cell lines--MDA-MB-435 and MDA-MB-231--than in human breast epithelial cell line MCF10A. miR-27a could modulate proliferation and radiosensitivity of TNBC cells. CDC-27 is a direct target of miR-27a and its downregulation conferred increased radioresistance of the cells.
Conclusions:
The miR-27a-CDC27 axis might play an important role in modulating response to radiotherapy in TNBC cells. Testing miR-27a expression might be a useful way to identify a subgroup of patients who will benefit from an IR-based therapeutic approach.
Insights
MicroRNA-27a (miR-27a) is overexpressed in triple-negative breast cancer (TNBC), impacting cell radiosensitivity. Targeting the miR-27a-CDC27 axis may improve radiotherapy response in TNBC patients.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Triple-negative breast cancer (TNBC) exhibits significant overexpression of microRNA-27a (miR-27a).
- The precise biological role of miR-27a in TNBC remains incompletely elucidated.
- This study investigates miR-27a expression and its functional impact on TNBC radiosensitivity.
Purpose of the Study:
- To verify miR-27a overexpression in TNBC cell lines.
- To explore the functional relationship between miR-27a and the radiosensitivity of TNBC cells.
- To identify the downstream target of miR-27a involved in its effects on radiosensitivity.
Main Methods:
- Quantitative reverse transcription-polymerase chain reaction (qRT-PCR) for miR-27a expression analysis.
- Dual luciferase assay to validate CDC27 as a direct target of miR-27a.
- Cell Counting Kit-8 (CCK-8) assay to assess cell proliferation under irradiation (IR).
Main Results:
- Confirmed significantly higher miR-27a expression in TNBC cell lines (MDA-MB-435, MDA-MB-231) compared to normal breast epithelial cells (MCF10A).
- Demonstrated that miR-27a modulates TNBC cell proliferation and radiosensitivity.
- Identified CDC27 as a direct miR-27a target, where its downregulation confers increased radioresistance.
Conclusions:
- The miR-27a-CDC27 axis plays a crucial role in regulating radiotherapy response in TNBC cells.
- Measuring miR-27a expression could identify TNBC patients likely to benefit from IR-based therapies.
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