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Neutron-activatable radionuclide cancer therapy using graphene oxide nanoplatelets.
Nuclear Medicine and Biology 2017 September
Neutron-activation is a promising method of generating radiotherapeutics with minimal handling of radioactive materials. Graphene oxide nanoplatelets (GONs) were examined as a carrier for neutron-activatable holmium with the purpose of exploiting inherent characteristics for theranostic application. GONs were hypothesized to be an ideal candidate for this application owing to their desirable characteristics such as a rigid structure, high metal loading capacity, low density, heat resistance, and the ability to withstand harsh environments associated with the neutron-activation process. Non-covalently PEGylated GONs (GONs-PEG) offered enhanced dispersibility and biocompatibility, and also exhibited increased holmium loading capacity nearly two-fold greater than GONs. Holmium leaching was investigated over a wide pH range, including conditions that mimic the tumor microenvironment, following neutron irradiation. The in vitro cell-based cytotoxicity analysis of GONs-based formulations with non-radioactive holmium confirmed their safety profile within cells. The results demonstrate the potential of GONs as a carrier of neutron-activatable radiotherapeutic agents.
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