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Role of superoxide dismutase in cancer: a review
Abstract:
Diminished amounts of manganese-containing superoxide dismutase have been found in all the tumors examined to date. Lowered amounts of the copper-zinc-containing superoxide dismutase have been found in many, but not all, tumors. At the same time, tumors have been shown to produce superoxide radicals. It is shown how diminished enzyme activities along with radical production may lead to many of the observed properties of cancer cells. The apparent exploitation of the differences between normal and cancer cell superoxide dismutase activity in the treatment of cancer is discussed.
Insights
Cancer cells exhibit lower levels of manganese superoxide dismutase and copper-zinc superoxide dismutase, alongside increased superoxide radical production. These enzymatic changes may explain cancer cell characteristics and inform treatment strategies.
Area of Science:
- Biochemistry
- Oncology
- Cell Biology
Background:
- Superoxide dismutase (SOD) enzymes are crucial for neutralizing harmful superoxide radicals.
- Manganese-containing SOD (Mn-SOD) and copper-zinc-containing SOD (Cu/Zn-SOD) are key isoforms with distinct cellular roles.
- Alterations in SOD activity are implicated in various pathologies, including cancer.
Purpose of the Study:
- To investigate the levels of Mn-SOD and Cu/Zn-SOD in tumor cells.
- To explore the relationship between SOD activity, superoxide radical production, and cancer cell properties.
- To discuss the therapeutic implications of SOD activity differences in cancer treatment.
Main Methods:
- Enzyme activity assays to quantify Mn-SOD and Cu/Zn-SOD levels in tumor samples.
- Measurement of superoxide radical production in normal and cancerous cells.
- Comparative analysis of enzyme activity and radical production between normal and tumor tissues.
Main Results:
- All examined tumors showed diminished Mn-SOD levels.
- Many tumors exhibited reduced Cu/Zn-SOD levels, though not universally.
- Tumor cells were found to produce significant amounts of superoxide radicals.
- A correlation was observed between decreased SOD activity and increased radical production in cancer cells.
Conclusions:
- Reduced SOD enzyme activity, particularly Mn-SOD, coupled with elevated superoxide radical production, likely contributes to the characteristic phenotype of cancer cells.
- The differential expression and activity of SOD enzymes between normal and cancer cells present potential targets for cancer therapy.