STAT3 Signaling in Cancer Biology

Signal transducer and activator of transcription 3 (STAT3) occupies a central node in oncogenic signalling networks. Under normal conditions, STAT3 is activated transiently by phosphorylation on a critical tyrosine residue, leading to dimerisation, nuclear translocation and regulation of gene expression. In cancer, persistent activation of STAT3 arises from aberrant stimulation by cytokines, growth factors and loss of negative regulators. Once constitutively activated, STAT3 drives key hallmarks of malignancy, including uncontrolled proliferation, resistance to apoptosis, angiogenesis, immune evasion and maintenance of cancer stem cells. Through direct transcriptional control, STAT3 induces expression of genes that promote epithelial–mesenchymal transition, remodel the tumour microenvironment and reprogramme metabolism. Moreover, cross-talk with epigenetic modifiers and non-coding RNAs further amplifies STAT3’s oncogenic output. Given its pervasive role across tumour types, STAT3 has emerged as a promising target for therapeutic intervention, with efforts aimed at disrupting its activation, dimerisation, DNA binding or interaction with essential cofactors.

Research from Nature Portfolio

Recent studies have delineated the multiplicity of upstream inputs and downstream effects of STAT3 in cancer. A foundational investigation revealed that, beyond classical cytokine receptors, G-protein-coupled receptors, cadherin engagement, Toll-like receptors and microRNAs modulate STAT3 activation. This work also highlighted STAT3’s role in driving epithelial–mesenchymal transition phenotypes, supporting cancer stem cell self-renewal and reshaping the tumour microenvironment through epigenetic mechanisms. These insights underscore the complexity of STAT3 regulation and the imperative for refined strategies to achieve potent and selective therapeutic inhibition.

STAT3 Signaling in Cancer Biology publication trend

The graph below shows the total number of articles in stat3 signaling in cancer biology across all publications each year (not limited to Nature Index journals).

Technical terms

Phosphorylation: Addition of a phosphate group to a protein, altering its activity or interactions.

Dimerisation: Association of two protein molecules, often required for DNA binding by transcription factors.

Transcription factor: Protein that binds DNA to regulate gene expression.

Epithelial–mesenchymal transition (EMT): Phenotypic switch by which epithelial cells acquire migratory and invasive properties.

Tumour microenvironment: Network of non-cancerous cells, extracellular matrix and signalling molecules surrounding a tumour.

Ubiquitination: Attachment of ubiquitin to a protein, commonly marking it for degradation.

References

1. JAK/STAT in leukemia: a clinical update. Molecular Cancer (2024).
2. Proteinase 3 depletion attenuates leukemia by promoting myeloid differentiation. Cell Death & Differentiation (2024).
3. Multiple regulation pathways and pivotal biological functions of STAT3 in cancer. Scientific Reports (2015).