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13rd Department of Internal Medicine, University Hospital and Faculty of Medicine, Hradec Kralove, Charles University, Hradec Kralove, Czech Republic.
Neoplasma
|March 18, 2020
Summary
Gold nanoparticles (AuNPs) can enhance radiation therapy for bone tumors by increasing radiation dose within cancer cells. Functionalized AuNPs targeted the cell nucleus, showing potential for overcoming radioresistance and improving patient outcomes.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Oncology
Background:
- Standard osteosarcoma treatment relies on major surgeries, often causing severe functional deficits, especially for pelvic tumors.
- Radiation therapy offers a complementary strategy to improve survival and quality of life for bone cancer patients.
- Gold nanoparticles (AuNPs) show promise in enhancing radiosensitivity by concentrating radiation dose within tumors.
Purpose of the Study:
- To investigate the efficacy of gold nanoparticles (AuNPs) in radiosensitizing primary bone tumor cells.
- To explore the mechanism of DNA repair inhibition in the presence of AuNPs for overcoming radioresistance.
- To determine the optimal size and functionalization of AuNPs for enhanced cellular uptake and nuclear targeting.
Main Methods:
- Preparation and characterization of two gold nanoparticle (AuNP) systems (5 nm and 50 nm core sizes).
- Functionalization of AuNPs with cell-penetrating peptides (CPP) and nuclear localization signals (NLS) for targeted delivery.
- Assessment of AuNP cellular uptake, nuclear penetration, and cytotoxicity using MTS assay.
- Investigation of AuNP size-dependent uptake in 143B bone tumor cells.
Main Results:
- Stable, functionalized AuNP systems of both 5 nm and 50 nm sizes were successfully prepared.
- Functionalization with CPP and NLS enabled AuNP penetration into the cell nucleus.
- AuNP uptake was found to be dependent on nanoparticle size, with optimal size related to nuclear pore dimensions.
- AuNP systems demonstrated low toxicity, indicating their potential for therapeutic applications.
Conclusions:
- Functionalized AuNPs can be effectively delivered into the nucleus of bone tumor cells.
- Targeted delivery of AuNPs offers a potential strategy to inhibit DNA repair and enhance radiosensitivity.
- This approach holds promise for improving the effectiveness of radiation therapy and overcoming radioresistance in primary bone tumors.
