MicroRNA-29 Family Functions in Cancer Progression

The microRNA-29 family, comprising miR-29a, miR-29b and miR-29c, occupies a central role in oncogenic and tumour-suppressive networks across a broad spectrum of malignancies. These small non-coding RNAs modulate gene expression post-transcriptionally, targeting key effectors of cell proliferation, apoptosis, extracellular matrix remodelling and angiogenesis. In many solid tumours and haematological cancers, miR-29 members repress DNA methyltransferases and epigenetic regulators, restoring tumour-suppressor gene activity. Conversely, in certain breast and triple-negative breast cancer subtypes, elevated miR-29a or miR-29b-3p levels drive metastatic programmes by downregulating PTEN or TRAF3 and activating AKT or NF-κB signalling. The family’s dualistic behaviour extends to the tumour microenvironment, where it influences immune surveillance through proteasome subunit expression and chemokine production. Preclinical models demonstrate that synthetic mimics or inhibitors of miR-29 can attenuate invasion, restore chemosensitivity and inhibit metastatic dissemination. As such, miR-29 family members are emerging both as prognostic biomarkers and as therapeutic targets amenable to nanotechnology-based delivery systems and gene-silencing approaches.

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MicroRNA-29 Family Functions in Cancer Progression publication trend

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Technical terms

MicroRNA: Small non-coding RNA molecule that regulates gene expression by binding to target mRNAs.

Epithelial-to-mesenchymal transition (EMT): Process by which epithelial cells acquire migratory and invasive mesenchymal properties.

Metastasis: Spread of cancer cells from the primary tumour to distant organs.

DNA methyltransferase 3B (DNMT3B): Enzyme responsible for de novo DNA methylation, often upregulated in cancer.

PI3K/AKT pathway: Intracellular signalling cascade that promotes cell growth, survival and metabolism.

References

1. Regulation of ERα-dependent breast cancer metastasis by a miR-29a signaling. Journal of Experimental & Clinical Cancer Research (2023).
2. Immune escape of multiple myeloma cells results from low miR29b and the ensuing epigenetic silencing of proteasome genes. Biomarker Research (2024).
3. Discovering the Biological Significance and Therapeutic Potential of miR-29b-3p in Triple-Negative Breast Cancer. International Journal of Molecular Sciences (2023).
4. miR-29b-3p promotes progression of MDA-MB-231 triple-negative breast cancer cells through downregulating TRAF3. Biological Research (2019).
5. miR-29 Represses the Activities of DNA Methyltransferases and DNA Demethylases. International Journal of Molecular Sciences (2013).