S100 Protein Family in Cancer Biology
Summary
The S100 protein family comprises 21 low–molecular–weight EF-hand calcium-binding proteins that orchestrate a broad spectrum of intracellular and extracellular processes pivotal to tumourigenesis. Intracellularly, S100 proteins modulate cytoskeletal dynamics, cell proliferation, apoptosis and differentiation through calcium-dependent interactions with target molecules. Extracellularly, several family members act as damage-associated molecular patterns to regulate immune cell recruitment, inflammation and angiogenesis within the tumour microenvironment. Dysregulated expression of specific S100 isoforms has been observed across diverse malignancies, where they may function as oncogenes or tumour suppressors. For example, overexpression of S100A4, S100A7 and S100A14 correlates with enhanced invasion, metastasis and poor prognosis, whereas S100A2 and S100B can exert context-dependent growth-inhibitory effects. The dual intracellular and extracellular roles of S100 proteins allow them to influence cancer cell survival, motility, metastatic colonisation and resistance to therapy. Their prominent expression in neoplastic tissues and accessibility in body fluids also render them attractive candidates for biomarker development and targeted intervention. Advances in understanding S100-mediated signalling networks have underscored their central role in tumour progression and highlighted potential avenues for precision oncology.
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Technical terms
EF-hand motif: A helix–loop–helix structural domain that binds calcium ions to regulate protein conformation and function.
Heterodimer: A complex formed by two different protein subunits, such as the S100A8/A9 heterodimer.
Tumour microenvironment: The surrounding cellular, molecular and vascular milieu in which tumour cells exist and interact.
Biomarker: A measurable indicator of biological or pathological processes, or responses to therapy, used for diagnosis or prognosis.
References
- S100A6: molecular function and biomarker role. Biomarker Research (2023).
- S100A8/A9 in Inflammation. Frontiers in Immunology (2018).
- Tumor-infiltrating monocytes/macrophages promote tumor invasion and migration by upregulating S100A8 and S100A9 expression in cancer cells. Oncogene (2016).
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