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Engineering Mesoporous Silica Nanoparticles for Targeted Alpha Therapy against Breast Cancer
Roger M Pallares1, Peter Agbo1, Xin Liu1
1Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
ACS Applied Materials & Interfaces
|August 19, 2020
Summary
Multifunctional silica nanoparticles show promise for targeted alpha therapy in cancer treatment. These engineered nanoparticles enhance radionuclide delivery to cancer cells and improve excretion, minimizing side effects.
Area of Science:
- Nanotechnology
- Radiochemistry
- Oncology
Background:
- Targeted alpha therapy (TAT) offers potent cancer treatment by delivering high doses of radiation to tumor cells.
- Limitations in radionuclide delivery and dose confinement hinder the clinical application of TAT.
Purpose of the Study:
- To develop multifunctional silica nanoconstructs for enhanced targeted alpha therapy.
- To evaluate their targeting, cytotoxicity, and in vivo clearance properties.
Main Methods:
- Silica nanoparticles were functionalized with transferrin for cancer cell targeting and 3,4,3-LI(1,2-HOPO) for radionuclide chelation.
- Nanoparticles were loaded with Actinium-225 (225Ac), a therapeutic radioisotope.
- In vivo studies in mice were conducted to assess biodistribution and excretion.
Main Results:
- The nanoconstructs demonstrated effective targeting and accumulation in breast cancer cells.
- Loading with 225Ac resulted in significant cytotoxic effects at therapeutic doses.
- In vivo studies showed enhanced excretion and reduced bone deposition of the radionuclides when delivered via nanoparticles.
Conclusions:
- Multifunctional silica nanoparticles are a viable delivery system for targeted alpha therapy.
- These findings provide design insights for developing novel nanotherapeutic agents for cancer treatment.
