期刊
NANOMEDICINE
卷 8, 期 10, 页码 1601-1609出版社
FUTURE MEDICINE LTD
DOI: 10.2217/NNM.12.165
关键词
brain tumor; cancer; contrast agent; dose enhancement; glioma; gold nanoparticle; imaging; microcomputed tomography; radiotherapy; x-ray
资金
- NIH [1R43CA134074]
Aim: To test intravenously injected gold nanoparticles for x-ray imaging and radiotherapy enhancement of large, imminently lethal, intracerebral malignant gliomas. Materials & methods: Gold nanoparticles approximately 11 nm in size were injected intravenously and brains imaged using microcomputed tomography. A total of 15 h after an intravenous dose of 4 g Au/kg was administered, brains were irradiated with 30 Gy 100 kVp x-rays. Results: Gold uptake gave a 19: 1 tumor to normal brain ratio with 1.5% w/w gold in tumor, calculated to increase local radiation dose by approximately 300%. Mice receiving gold and radiation (30 Gy) demonstrated 50% long term (>1 year) tumor-free survival, whereas all mice receiving radiation only died. Conclusion: Intravenously injected gold nanoparticles cross the blood-tumor barrier, but are largely blocked by the normal blood-brain barrier, enabling high-resolution computed tomography tumor imaging. Gold radiation enhancement significantly improved long-term survival compared with radiotherapy alone. This approach holds promise to improve therapy of human brain tumors and other cancers.
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