Mucin Expression Dynamics in Colorectal Carcinogenesis

The mucin family of glycoproteins plays a central role in maintaining the integrity of the colonic epithelium and shaping the tumour microenvironment throughout colorectal carcinogenesis. In the healthy colon, MUC2 forms a dense, gel-like barrier that limits microbial contact and inflammation. Early loss or silencing of MUC2 disrupts this protective layer, exposes the epithelium to pro-inflammatory signals and predisposes to neoplastic transformation. As lesions progress from benign polyps to adenocarcinoma, a shift in mucin repertoire emerges: gastric-type mucins such as MUC5AC and, in some cases, MUC6 become aberrantly expressed in dysplastic crypts, while classical membrane-bound mucins like MUC1 are variably upregulated in advanced tumours. These alterations influence cell–cell adhesion, immune evasion and response to chemotherapy. Crosstalk between mucins and key signalling nodes—such as the IL-6/STAT3 axis, Wnt/β-catenin pathway and CD44 receptor network—underlies enhanced invasion, metastatic potential and chemoresistance. A nuanced understanding of these dynamic expression patterns offers new avenues for stratified diagnosis, prognostic biomarkers and targeted therapies in colorectal cancer.

Research from Nature Portfolio

A foundational study has demonstrated that silencing of MUC2 in colon cancer cell lines markedly increases metastatic spread in vivo and enhances IL-6–mediated STAT3 activation. In this work, suppression of MUC2 led to reduced E-cadherin levels and elevated checkpoint kinase activity, creating a pro-migratory phenotype. Restoration of IL-6 blockade attenuated liver metastases and re-established epithelial adhesion, indicating that MUC2 functions not only as a physical barrier but also as a regulator of cytokine-driven signalling. These findings cement MUC2 downregulation as both an early carcinogenic event and a potential prognostic indicator, and they spotlight the IL-6/STAT3 axis as a therapeutic target in MUC2-low colorectal tumours.

Mucin Expression Dynamics in Colorectal Carcinogenesis publication trend

The graph below shows the total number of articles in mucin expression dynamics in colorectal carcinogenesis across all publications each year (not limited to Nature Index journals).

Technical terms

Mucin: High-molecular-weight glycoproteins that form a protective mucus layer on epithelial surfaces.

MUC2: The principal gel-forming mucin of the colonic epithelium, essential for barrier function.

MUC5AC: A secretory mucin normally expressed in gastric mucosa but aberrantly induced in colorectal neoplasia.

Tumour microenvironment: The complex milieu of cancer cells, stromal elements and immune components that influences tumour behaviour.

Chemoresistance: The capacity of cancer cells to withstand and evade the cytotoxic effects of chemotherapy agents.

References

1. Proinflammatory Microenvironment in Adenocarcinoma Tissue of Colorectal Carcinoma. International Journal of Molecular Sciences (2024).
2. The Mucin Family of Proteins: Candidates as Potential Biomarkers for Colon Cancer. Cancers (2023).
3. Molecular implications of MUC5AC-CD44 axis in colorectal cancer progression and chemoresistance. Molecular Cancer (2020).
4. Mucin 2 silencing promotes colon cancer metastasis through interleukin-6 signaling. Scientific Reports (2017).