Chemically Powered Nanomotors with Magnetically Responsive Function for Targeted Delivery of Exosomes

Area of Science:

• Materials Science
• Nanotechnology
• Biomedical Engineering

Background:

• Janus nanomotors are crucial for chemical propulsion, but magnetic responsiveness often relies on sputtering metal films.
• Platinum nanoparticles offer a superior surface area and catalytic activity compared to platinum films for nanomotor fabrication.
• Exosomes show promise for drug delivery but are limited by poor targetability in clinical applications.

Purpose of the Study:

• To develop novel Janus nanomotors using a self-assembly technique for enhanced chemical and magnetic responsiveness.
• To utilize these nanomotors for targeted delivery of exosomes loaded with doxorubicin (DOX) to breast cancer cells.
• To investigate the improved cellular uptake and therapeutic potential of exosome-loaded nanomotors.

Main Methods:

• Fabrication of Janus nanomotors via self-assembly of platinum nanoparticles onto magnetic silica (SiO2@Fe3O4) nanoparticles.
• Utilizing a low concentration (0.05%) of hydrogen peroxide (H2O2) as fuel for nanomotor propulsion.
• Encapsulating doxorubicin (DOX) within exosomes and subsequently loading them onto the nanomotors for targeted delivery.

Main Results:

• The platinum nanoparticle-based Janus nanomotors demonstrated enhanced diffusion and motion performance.
• Exosome-loaded nanomotors significantly improved targetability and cellular entry into breast cancer cells under H2O2 conditions.
• A notable increase in the rate of exosome entry into cancer cells was observed, indicating enhanced drug delivery efficacy.

Conclusions:

• A novel hybrid nanomotor system combining chemical and magnetic responsiveness was successfully developed.
• The self-assembled Janus nanomotors provide an efficient platform for targeted exosome delivery, overcoming tropism limitations.
• This approach offers a promising strategy for enhancing the efficacy of cancer therapeutics like doxorubicin.