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Updated: Feb 5, 2026

Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells
Published on: February 21, 2014
Pax-5 Inhibits Breast Cancer Proliferation Through MiR-215 Up-regulation
Nicolas Leblanc1,2, Jason Harquail1,2, Nicolas Crapoulet1,2
1Department of Chemistry and Biochemistry, University of Moncton, Moncton, Canada.
Background/Aim:
In breast cancer, Pax-5 promotes pro-epithelial features and suppresses malignant cancer processes. However, the molecular mechanism of this antitumor activity remains largely unknown. This study aimed to identify the cellular roles of Pax-5-regulated miRNAs in breast cancer progression.
Materials And Methods:
After transient transfection of Pax-5 in MDA-MB-231 breast cancer cells, Pax-5-regulated miRNA expression was examined by next-generation sequencing. The identified Pax-5-regulated miRNAs were then validated by qRT-PCR and examined for the roles they play in breast cancer cells.
Results:
Pax-5 was shown to be an effective modulator of miR-215-5p and its target genes. MiR-215 inhibited cell proliferation and migration of breast cancer cells, but not cell invasion. More importantly, Pax-5-induced suppression of cancer cell proliferation and migration was found to be miR-215-dependent. Interestingly, miR-215 profiling in clinical tumor samples showed that miR-215 expression was lower in cancer tissues in comparison to healthy controls.
Conclusion:
Pax-5 reduces breast cancer proliferation and migration through up-regulation of the tumor suppressor miR-215. This result supports the use of miR-215 as a prognostic marker for breast cancer.
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