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Silver nanoparticles: a novel radiation sensitizer for glioma?
Peidang Liu1, Zhihai Huang, Zhongwen Chen
1Jiangsu Key Laboratory for Biomaterials and Devices, State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, PR China. guning@seu.edu.cn.
Abstract:
Malignant gliomas are the most common primary intracranial tumors with a dismal prognosis. Previous investigations by our group demonstrated the radiosensitizing effect of silver nanoparticles (AgNPs) on glioma cells in vitro. The goal of the present study was to evaluate the efficacy of intratumoral administration of AgNPs in combination with a single dose of ionizing radiation at clinically relevant MV energies for the treatment of C6 glioma-bearing rats. AgNPs (10 or 20 μg/10 μl) were stereotactically administered on day 8 after tumor implantation. One day after AgNP injection, rats bearing glioma received 10 Gy radiation. The mean survival times were 100.5 and 98 days, the corresponding percent increase in life spans was 513.2% and 497.7%, and the cure rates were 41.7 and 38.5% at 200 days for the 10 and 20 μg AgNPs and radiation combination groups, respectively. In contrast, the mean survival times for irradiated controls, 10 and 20 μg AgNPs alone, and untreated controls were 24.5, 16.1, 19.4, and 16.4 days, respectively. Furthermore, a cooperative antiproliferative and proapoptotic effect was obtained when gliomas were treated with AgNPs followed by radiotherapy. Our results showed the therapeutic efficacy of AgNPs in combination with radiotherapy without apparent systemic toxicity, suggesting the clinical potential of AgNPs in improving the outcome of malignant glioma radiotherapy.
Insights
Silver nanoparticles (AgNPs) combined with radiotherapy significantly improved survival and cure rates in rats with malignant gliomas. This combination therapy shows promise for treating brain tumors with minimal toxicity.
Area of Science:
- Oncology
- Nanomedicine
- Radiotherapy
Background:
- Malignant gliomas are aggressive brain tumors with poor prognoses.
- Silver nanoparticles (AgNPs) have demonstrated radiosensitizing effects on glioma cells in vitro.
- Intratumoral AgNP administration combined with radiotherapy warrants investigation for glioma treatment.
Purpose of the Study:
- To evaluate the efficacy of intratumoral silver nanoparticles (AgNPs) combined with ionizing radiation for treating C6 gliomas in rats.
- To assess the impact of AgNPs and radiotherapy on survival rates and tumor response.
- To determine the potential systemic toxicity of this combined treatment modality.
Main Methods:
- Rats with C6 gliomas received stereotactic intratumoral injections of AgNPs (10 or 20 μg).
- One day post-injection, rats were treated with a single dose of 10 Gy ionizing radiation.
- Survival times, lifespan increase, cure rates, and tumor response were analyzed and compared to control groups.
Main Results:
- Combination therapy with 10 or 20 μg AgNPs and radiation resulted in mean survival times of 100.5 and 98 days, respectively, with cure rates of 41.7% and 38.5%.
- This significantly increased lifespan compared to irradiated controls (24.5 days) and AgNP-alone or untreated groups.
- AgNPs followed by radiotherapy demonstrated synergistic antiproliferative and proapoptotic effects on gliomas.
Conclusions:
- Intratumoral AgNPs combined with radiotherapy show significant therapeutic efficacy in a rat glioma model.
- The combination treatment offers a promising strategy for improving malignant glioma radiotherapy outcomes.
- No apparent systemic toxicity was observed, suggesting clinical potential for AgNPs in brain tumor treatment.
