MAL Proteins in Cancer Biology and Cell Mechanisms
Summary
MAL proteins constitute a family of small, proteolipid membrane components characterised by four transmembrane segments. In normal physiology they organise specialised membrane domains, mediate apical sorting in epithelial cells, and contribute to raft-dependent signalling in lymphocytes and myelin-forming cells. In cancer biology, members of this family show context-dependent roles: MAL often behaves as a tumour suppressor, subject to epigenetic silencing, whereas MAL2 and related isoforms may be upregulated and repurposed to promote cell motility, invasion and survival. Mechanistically, dysregulated MAL proteins influence epithelial–mesenchymal transition, modulate key pathways such as β-catenin/c-Myc and STAT3, and alter cytoskeletal dynamics through actin remodelling. These multifaceted activities underpin their emerging value as prognostic biomarkers and potential therapeutic targets across diverse malignancies, from breast and colorectal carcinomas to gastric and hepatic tumours.
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MAL Proteins in Cancer Biology and Cell Mechanisms publication trend
The graph below shows the total number of articles in mal proteins in cancer biology and cell mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
MAL proteins: A family of four-transmembrane proteolipids involved in organising specialised membrane microdomains and mediating apical sorting.
MAL2: A paralogue of MAL that often demonstrates oncogenic properties, promoting membrane trafficking changes linked to metastasis.
Epithelial–mesenchymal transition (EMT): A cellular programme whereby epithelial cells acquire migratory and invasive mesenchymal traits.
Lipid rafts: Ordered, cholesterol-rich microdomains in the plasma membrane that compartmentalise signalling and trafficking functions.
Signal transducer and activator of transcription 3 (STAT3): A transcription factor activated by phosphorylation, implicated in cell survival, proliferation and EMT in cancer.
References
- Downregulation of MAL2 inhibits breast cancer progression through regulating β-catenin/c-Myc axis. Cancer Cell International (2023).
- The MAL Family of Proteins: Normal Function, Expression in Cancer, and Potential Use as Cancer Biomarkers. Cancers (2023).
- Epigenetic silencing of MAL, a putative tumor suppressor gene, can contribute to human epithelium cell carcinoma. Molecular Cancer (2010).
- MAL protein suppresses the metastasis and invasion of GC cells by interfering with the phosphorylation of STAT3. Journal of Translational Medicine (2022).
- The MAL Protein, an Integral Component of Specialized Membranes, in Normal Cells and Cancer. Cells (2021).
- MAL Mediates Apical Transport of Secretory Proteins in Polarized Epithelial Madin-Darby Canine Kidney Cells*. Journal of Biological Chemistry (2001).
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