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Bioluminescence Imaging of NADPH Oxidase Activity in Different Animal Models
Published on: October 22, 2012
Nuclear NADPH oxidase-4 associated with disease progression in renal cell carcinoma
Dharam Kaushik1, Keith A Ashcraft1, Hanzhang Wang1
1Department of Urology, University of Texas Health, San Antonio, Texas.
Abstract:
Nuclear NADPH oxidase-4 (Nox4) is a key component of metabolic reprogramming and is often overexpressed in renal cell carcinoma (RCC). However, its prognostic role in RCC remains unclear. Here we examined the significance of nuclear Nox4 on disease progression and development of drug resistance in advanced RCC. We analyzed human RCC tissue from multiple regions in the primary index tumor, cancer-associated normal adjacent parenchyma, intravascular tumor in locally advanced cancer patients. We found that the higher nuclear Nox4 expression was significantly associated with progression and death. These findings were consistent after controlling for other competing clinical variables. In contrast, patients with lower nuclear Nox4, even in higher stage RCC had better prognosis. We identified a subset of patients with high nuclear Nox4 who had rapid disease progression or died within 6 months of surgery. In addition, higher nuclear Nox4 level correlated with resistance to targeted therapy and immunotherapy. Western blotting performed on fresh human RCC tissue as well as cell-lines revealed increased nuclear Nox4 expression. Our data support an important prognostic role of Nox4 mediated regulation of RCC independent of other competing variables. Nox4 localizes to the nucleus in high-grade, high-stage RCC. Higher nuclear Nox4 has prognostic significance for disease progression, poor survival, and development of drug resistance in RCC.
Insights
High nuclear NADPH oxidase-4 (Nox4) expression in renal cell carcinoma (RCC) predicts faster disease progression, poorer survival, and resistance to therapies. Lower Nox4 levels indicate a better prognosis in advanced RCC patients.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Nuclear NADPH oxidase-4 (Nox4) is implicated in metabolic reprogramming and frequently overexpressed in renal cell carcinoma (RCC).
- The prognostic significance of nuclear Nox4 in RCC progression and treatment resistance remains largely undetermined.
- Understanding Nox4's role is crucial for developing novel therapeutic strategies against advanced RCC.
Purpose of the Study:
- To investigate the prognostic value of nuclear Nox4 expression in advanced renal cell carcinoma.
- To determine the association between nuclear Nox4 levels and disease progression, patient survival, and resistance to targeted therapy and immunotherapy.
- To elucidate the localization and expression patterns of Nox4 in human RCC tissues and cell lines.
Main Methods:
- Analysis of human RCC tissue samples from primary tumors, adjacent normal parenchyma, and intravascular tumor sites.
- Assessment of nuclear Nox4 expression using techniques such as Western blotting on fresh tissues and cell lines.
- Statistical analysis to correlate nuclear Nox4 levels with clinical variables, disease progression, survival outcomes, and treatment response.
Main Results:
- Higher nuclear Nox4 expression significantly correlated with advanced disease progression and increased mortality in RCC patients.
- Patients with lower nuclear Nox4 exhibited better prognoses, even in higher stages of RCC.
- Elevated nuclear Nox4 levels were associated with resistance to both targeted therapy and immunotherapy in advanced RCC.
- Nox4 was observed to localize within the nucleus in high-grade, high-stage RCC specimens.
Conclusions:
- Nuclear Nox4 expression serves as an independent prognostic biomarker for disease progression and survival in renal cell carcinoma.
- Nox4-mediated regulation plays a critical role in the development of drug resistance in advanced RCC.
- Targeting nuclear Nox4 may represent a potential therapeutic strategy to overcome treatment resistance and improve outcomes in RCC.
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