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Reactive oxygen generated by Nox1 triggers the angiogenic switch
Jack L Arbiser1, John Petros, Robert Klafter
1Department of Dermatology, Emory University School of Medicine, Atlanta, GA 30322, USA. jarbise@emory.edu
Summary
The reactive oxygen-generating enzyme Nox1 increases cancer cell tumorigenicity and triggers the angiogenic switch. Hydrogen peroxide signaling mediates Nox1
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- The enzyme Nox1 generates reactive oxygen species and is implicated in cell transformation.
- Nox1's role in increasing tumorigenicity and angiogenesis requires further elucidation.
Purpose of the Study:
- To investigate the role of Nox1 in promoting tumorigenicity and angiogenesis in NIH 3T3 fibroblasts and DU-145 prostate epithelial cells.
- To identify the molecular mechanisms by which Nox1 influences tumor growth and vascularization.
Main Methods:
- Cell culture of NIH 3T3 and DU-145 cells.
- Assessment of cell division and tumorigenicity.
- Analysis of angiogenic markers, including vascular endothelial growth factor (VEGF) mRNA and matrix metalloproteinase activity.
- Investigation of the role of hydrogen peroxide using catalase coexpression.
Main Results:
- Nox1 expression increased tumorigenicity in both cell types.
- Nox1 significantly upregulated vascular endothelial growth factor (VEGF) mRNA and induced matrix metalloproteinase activity, key markers of angiogenesis.
- Nox1 also increased the expression of VEGF receptors (VEGFR1 and VEGFR2) in vascular cells within tumors.
- Catalase coexpression abolished Nox1-induced VEGF upregulation, indicating hydrogen peroxide's signaling role.
Conclusions:
- Nox1 is a potent inducer of the angiogenic switch, contributing to tumor vascularity.
- Hydrogen peroxide acts as a crucial signaling molecule in the Nox1-mediated angiogenic process.
- Targeting Nox1 or its downstream signaling pathways may offer therapeutic strategies for cancer treatment.