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Disrupting SOD1 activity inhibits cell growth and enhances lipid accumulation in nasopharyngeal carcinoma
Shuai Li1, Lanyan Fu1, Tian Tian2
1Department of Biochemistry and Molecular Biology, GMU-GIBH Joint School of Life Sciences, Guangzhou Medical University, Guangzhou, 510182, People's Republic of China.
Background:
SOD1 is an abundant enzyme that has been studied as a regulator of the antioxidant defence system, and this enzyme is well known for catalyzing the dismutation of superoxide into hydrogen peroxide. However the SOD1 in the progress of NPC and underlying mechanisms remain unclear.
Methods:
In NPC tissue samples, SOD1 protein levels were measured by Western blot and immunohistochemical (IHC) staining. mRNA levels and SOD1 activity were monitored by qRT-PCR and SOD activity kit, respectively. Kaplan-Meier survival analysis was performed to explore the relationship between SOD1 expression and prognosis of NPC. The biological effects of SOD1 were investigated both in vitro by CCK-8, clonogenicity and apoptosis assays and in vivo by a xenograft mice model. Western blotting, ROS assay and triglyceride assays were applied to investigate the underlying molecular mechanism of pro-survival role of SOD1 in NPC.
Results:
We observed a significant upregulation of SOD1 in NPC tissue and high SOD1 expression is a predictor of poor prognosis and is correlated with poor outcome. We confirmed the pro-survival role of SOD1 both in vitro and in vivo. We demonstrated that these mechanisms of SOD1 partly exist to maintain low levels of the superoxide anion and to avoid the accumulation of lipid droplets via enhanced CPT1A-mediated fatty acid oxidation.
Conclusions:
The results of this study indicate that SOD1 is a potential prognostic biomarker and a promising target for NPC therapy.
Insights
Superoxide dismutase 1 (SOD1) is upregulated in nasopharyngeal carcinoma (NPC), promoting tumor survival and indicating poor prognosis. Targeting SOD1 may offer a new therapeutic strategy for NPC patients.
Area of Science:
- Biochemistry
- Oncology
- Molecular Biology
Background:
- Superoxide dismutase 1 (SOD1) is a key antioxidant enzyme catalyzing superoxide dismutation.
- The role and mechanisms of SOD1 in nasopharyngeal carcinoma (NPC) progression are not well understood.
Purpose of the Study:
- To investigate the expression levels of SOD1 in NPC tissues.
- To elucidate the functional role and underlying mechanisms of SOD1 in NPC.
- To evaluate SOD1 as a prognostic biomarker and therapeutic target for NPC.
Main Methods:
- Quantitative analysis of SOD1 in NPC tissues using Western blot, IHC, and qRT-PCR.
- Assessment of SOD1 activity and its effects on cell proliferation, apoptosis, and tumor growth in vitro and in vivo.
- Investigation of molecular mechanisms involving ROS levels and fatty acid oxidation via CPT1A.
Main Results:
- SOD1 is significantly upregulated in NPC tissues, correlating with poor prognosis and outcomes.
- SOD1 exhibits a pro-survival role in NPC, confirmed through in vitro and in vivo experiments.
- SOD1's pro-survival effects are partly mediated by reducing superoxide anion levels and promoting fatty acid oxidation via CPT1A, thus preventing lipid droplet accumulation.
Conclusions:
- SOD1 serves as a potential prognostic biomarker for NPC.
- SOD1 represents a promising therapeutic target for NPC treatment.
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