MicroRNA-203 Function in Cancer Biology

MicroRNA-203 (miR-203) is a small non-coding RNA that orchestrates critical regulatory networks in diverse malignancies by modulating gene expression at the post-transcriptional level. It is predominantly downregulated in a broad spectrum of tumours, where its restoration often triggers cell cycle arrest, apoptosis and suppression of migration and invasion. Central to its tumour-suppressive function is the targeting of oncogenic drivers and signalling pathways—most notably those governing PI3K/Akt, Wnt and TGF-β cascades—as well as key transcription factors that regulate epithelial–mesenchymal transition. Aberrant loss or epigenetic silencing of miR-203 correlates with metastatic dissemination, chemoresistance and poor clinical outcome, highlighting its promise as both a prognostic biomarker and a therapeutic agent. Continued elucidation of miR-203’s context-specific targets is driving innovative strategies for biomarker development and RNA-based therapies across multiple cancer types.

Research from Nature Portfolio

Recent studies have demonstrated that enforced expression of miR-203a-3p in breast cancer cell models inhibits activation of the PI3K/Akt and Wnt pathways, leading to downregulation of proliferation markers such as Cyclin D1 and c-Myc, induction of cell-cycle arrest and enhancement of apoptosis, thereby positioning miR-203a-3p as a potential biomarker and therapeutic target. In colorectal cancer, reintroduction of miR-203 markedly impaired tumour cell proliferation and invasion both in vitro and in vivo by directly targeting EIF5A2, with clinical specimens showing an inverse correlation between miR-203 levels and advanced stage, lymph node involvement and overall survival.

MicroRNA-203 Function in Cancer Biology publication trend

The graph below shows the total number of articles in microrna-203 function in cancer biology across all publications each year (not limited to Nature Index journals).

Technical terms

microRNA: Small non-coding RNA molecules that regulate gene expression post-transcriptionally by binding target mRNAs.

PI3K/Akt pathway: Intracellular signalling cascade crucial for cell growth and survival, frequently dysregulated in cancer.

Epithelial–mesenchymal transition: Cellular programme enabling epithelial cells to acquire enhanced migratory and invasive capacities.

Tumour suppressor: Gene or molecule that acts to restrain cell proliferation and prevent tumour initiation or progression.

Apoptosis: Programmed cell death mechanism essential for eliminating damaged or unwanted cells.

References

1. MicroRNA-203a inhibits breast cancer progression through the PI3K/Akt and Wnt pathways. Scientific Reports (2024).
2. MiRNA-203 suppresses cell proliferation, migration and invasion in colorectal cancer via targeting of EIF5A2. Scientific Reports (2016).
3. MicroRNA-203 suppresses cell proliferation and migration by targeting BIRC5 and LASP1 in human triple-negative breast cancer cells. Journal of Experimental & Clinical Cancer Research (2012).
4. miR-203 inhibits ovarian tumor metastasis by targeting BIRC5 and attenuating the TGFβ pathway. Journal of Experimental & Clinical Cancer Research (2018).
5. MiR-203 downregulation is responsible for chemoresistance in human glioblastoma by promoting epithelial-mesenchymal transition via SNAI2. Oncotarget (2015).