Remote-Controlled DNA Release from Fe3O4@Au Nanoparticles Using an Alternating Electromagnetic Field.

Area of Science:

• Biotechnology
• Nanotechnology
• Materials Science

Background:

• DNA-modified nanoparticles offer potential for targeted therapies.
• Controlled release of DNA is crucial for therapeutic efficacy.
• Existing methods for DNA release may lack external control.

Purpose of the Study:

• To develop a remote-controlled DNA release strategy using alternating electromagnetic fields (AMF).
• To investigate the efficiency and controllability of AMF-triggered DNA release from nanoparticles.
• To demonstrate the in vitro applicability of the system in cancer cells.

Main Methods:

• Modification of Fe3O4@Au nanoparticles (NPs) with 6-carboxyfluorescein (FAM)-labeled diblock DNA.
• Application of an alternating electromagnetic field (AMF) at 20-25 kHz for DNA release.
• Confirmation of DNA release using zeta potential, surface-enhanced Raman scattering, gel electrophoresis, and fluorescence spectroscopy.
• In vitro testing in human cervical cancer (HeLa) cells.

Main Results:

• Efficient DNA release (60%-70%) was achieved upon AMF irradiation.
• DNA release was externally controllable by adjusting DNA sequence length, pH, and AMF parameters (power, time).
• Successful AMF-triggered DNA release was demonstrated in HeLa cells, indicating in vitro functionality.

Conclusions:

• A novel remote-controlled DNA release system utilizing AMF-responsive nanoparticles was successfully developed.
• The system offers efficient and tunable DNA release, applicable in biological environments.
• This technology presents a promising new avenue for DNA-based targeted therapies.