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Size-Tuning Ionization To Optimize Gold Nanoparticles for Simultaneous Enhanced CT Imaging and Radiotherapy
Abstract
Computed tomography (CT) contrast and radiosensitization usually increase with particle sizes of gold nanoparticles (AuNPs), but there is a huge challenge to improve both by adjusting sizes under the requirements of in vivo application. Here, we report that AuNPs have great size-dependent enhancements on CT imaging as well as radiotherapy (RT) in the size range of 3-50 nm. It is demonstrated that AuNPs with a size of ∼13 nm could simultaneously possess superior CT contrast ability and significant radioactive disruption. The Monte Carlo method is further used to evaluate this phenomenon and indicates that the inhomogeneity of gold atom distributions caused by sizes may influence secondary ionization in whole X-ray interactions. In vivo studies further indicate that this optimally sized AuNP improves real-time CT imaging and radiotherapeutic inhibition of tumors in living mice by effective accumulation at tumors with prolonged in vivo circulation times compared to clinically used small-molecule agents. These results suggest that ∼13 nm AuNPs may serve as multifunctional adjuvants for clinical X-ray theranostic application.
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Metadata
- Authors
- Dou, Y., Guo, Y., Li, X., Li, X., Wang, S., Wang, L., Lv, G., Zhang, X., Wang, H., Gong, X., & Chang, J.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-02-01
- Volume
- 10
- Issue
- 2
- Pages
- 2536-2548
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2309569522
- Cited by
- 288
- References
- 44
- FWCI
- 32.57
- Type
- journal article
- Language
- en
- Open access
- closed
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