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Growth inhibition and radiosensitization of cultured glioma cells by nitric oxide generating agents
M Kurimoto1, S Endo, Y Hirashima
1Department of Neurosurgery, Toyama Medical and Pharmaceutical University, Japan.
Abstract:
The authors examined the effect of nitric oxide (NO) generating agents on the growth and radiosensitivity of cultured glioma cells. Three glioma, rat C6, and human T98G and U87 cell lines were treated with the NO generating agents, S-nitroso-N-acetyl-penicillamine (SNAP) or sodium nitroprusside (SNP). These agents released NO in the cell culture media and inhibited the growth of the glioma cells. Growth-inhibition was attenuated by hemoglobin, a known inhibitor of NO, suggesting it is mediated by NO. When C6 and T98G cells were irradiated in the presence of SNAP or SNP at 100 microM, radiosensitization was observed. SNAP at 100 microM exhibited a sensitizer enhancement ratio (SER) of 1.4 for C6 cells and 1.8 for T98G cells. SNP at 100 microM only radiosensitized T98G cells with a SER of 1.9. The effect of SNP on radiosensitization of C6 cells was unclear. We conclude that NO generating agents are potential growth inhibitors and radiosensitizers for malignant glioma cells. NO mediated radiosensitization of glioma cells by NO generating agents may offer a new therapeutic approach for malignant glioma.
Insights
Nitric oxide (NO) generating agents inhibited glioma cell growth and enhanced radiosensitivity. These findings suggest NO-based therapies could be a new approach for malignant glioma treatment.
Area of Science:
- Neuro-oncology
- Radiation Oncology
- Molecular Biology
Background:
- Malignant gliomas are aggressive brain tumors with limited treatment options.
- Nitric oxide (NO) plays complex roles in cell physiology, including cancer progression.
- Investigating NO's effects on glioma growth and radiation response is crucial for therapeutic development.
Purpose of the Study:
- To evaluate the impact of NO-generating agents on cultured glioma cell growth.
- To determine if NO-generating agents can sensitize glioma cells to radiation therapy.
- To explore potential novel therapeutic strategies for malignant gliomas.
Main Methods:
- Cultured rat C6 and human T98G/U87 glioma cells were treated with NO-generating agents (SNAP, SNP).
- Cell growth inhibition was assessed, and the role of NO was confirmed using hemoglobin.
- Cells were irradiated in the presence of NO-generating agents to measure radiosensitization (SER).
Main Results:
- NO-generating agents (SNAP and SNP) significantly inhibited glioma cell growth.
- SNAP demonstrated radiosensitization for C6 (SER=1.4) and T98G (SER=1.8) cells.
- SNP radiosensitized T98G cells (SER=1.9), but its effect on C6 cells was inconclusive.
Conclusions:
- NO-generating agents act as potent growth inhibitors for malignant glioma cells.
- These agents show promise as radiosensitizers, potentially improving radiation therapy efficacy.
- NO-mediated radiosensitization offers a potential new therapeutic avenue for treating malignant gliomas.
