Manganese Superoxide Dismutase Dynamics in Cancer Biology

Manganese superoxide dismutase (MnSOD or SOD2) is a mitochondrial enzyme that catalyses the dismutation of superoxide radicals into hydrogen peroxide and oxygen, thus governing the balance of reactive oxygen species (ROS) within the organelle and the wider cell. In cancer biology, SOD2 occupies a dual role: at early stages it can suppress tumour initiation by mitigating DNA damage caused by excess superoxide, whereas in established malignancies it frequently becomes upregulated to support proliferation, invasion and adaptation to hostile microenvironments. Enhanced SOD2 activity shifts mitochondrial ROS species toward diffusible hydrogen peroxide, which acts as a second messenger to activate signal transduction pathways such as ERK1/2 and AMPK, driving metabolic reprogramming, the Warburg effect and epithelial–mesenchymal transition. Context-dependent regulation of SOD2 occurs at transcriptional, epigenetic and post-translational levels, enabling cancer cells to fine-tune redox homeostasis in response to oncogenic stress, inflammation and therapy. Beyond its mechanistic importance, SOD2 has emerged as a prognostic biomarker and therapeutic target, with strategies aimed at modulating its expression or activity showing promise in preclinical models of metastasis, radioresistance and chemoresistance.

Research from Nature Portfolio

Upregulation of SOD2 in breast cancer cells has been shown to establish a sustained mitochondrial hydrogen peroxide flux that engages AMP-activated protein kinase (AMPK), thereby enforcing a glycolytic switch and supporting tumour bioenergetics. Restricting SOD2 levels or blocking AMPK disrupts this metabolic adaptation and impairs viability of transformed cells, highlighting the SOD2–AMPK axis as a critical regulator of cancer cell metabolism and a potential biomarker of aggressive subtypes. In salivary adenoid cystic carcinoma, aberrant SOD2 expression correlates with distant metastasis and poor patient survival; modulation of SOD2 in cell lines alters intracellular H2O2, ERK1/2 signalling and Slug transcription factor levels, directly influencing invasive capacity. Furthermore, in models of inflammation-driven lung adenocarcinoma, tumour-associated cytokines induce NF-κB-dependent SOD2 upregulation in both immune and epithelial cells, promoting epithelial–mesenchymal transition and cell migration. Collectively, these studies establish SOD2 as a central mediator of redox-sensitive signalling pathways that underpin metabolic plasticity, invasion and microenvironmental crosstalk in diverse tumour settings.

Manganese Superoxide Dismutase Dynamics in Cancer Biology publication trend

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

Technical terms

Manganese superoxide dismutase (MnSOD/SOD2): A mitochondrial enzyme that converts superoxide radicals into hydrogen peroxide and oxygen, regulating ROS balance.

Reactive oxygen species (ROS): Chemically reactive molecules derived from oxygen, including superoxide and hydrogen peroxide, that function as both damaging agents and signalling mediators.

Warburg effect: The tendency of cancer cells to favour glycolysis over oxidative phosphorylation for ATP production, even in the presence of oxygen.

AMP-activated protein kinase (AMPK): A cellular energy sensor activated by rising AMP:ATP ratios, which can modulate metabolic pathways and redox homeostasis.

Epithelial–mesenchymal transition (EMT): A phenotypic switch in epithelial cells marked by loss of adhesion and gain of motility, facilitating invasion and metastasis.

References

1. IGFBP1 Sustains Cell Survival during Spatially‐Confined Migration and Promotes Tumor Metastasis. Advanced Science (2023).
2. Dose-Dependent Effect of Mitochondrial Superoxide Dismutase Gene Overexpression on Radioresistance of HEK293T Cells. International Journal of Molecular Sciences (2023).
3. MnSOD upregulation sustains the Warburg effect via mitochondrial ROS and AMPK-dependent signalling in cancer. Nature Communications (2015).
4. Insights into the Dichotomous Regulation of SOD2 in Cancer. Antioxidants (2017).
5. SOD2, a Potential Transcriptional Target Underpinning CD44-Promoted Breast Cancer Progression. Molecules (2022).
6. SOD2 deregulation enhances migration, invasion and has poor prognosis in salivary adenoid cystic carcinoma. Scientific Reports (2016).
7. Inflammation-mediated SOD-2 upregulation contributes to epithelial-mesenchymal transition and migration of tumor cells in aflatoxin G1-induced lung adenocarcinoma. Scientific Reports (2017).
8. Manganese Superoxide Dismutase Signals Matrix Metalloproteinase Expression via H2O2-dependent ERK1/2 Activation*. Journal of Biological Chemistry (2001).