Light-responsive smart nanocarriers for wirelessly controlled photodynamic therapy for prostate cancers

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Photodynamic Therapy

Background:

• Photodynamic therapy (PDT) shows promise for cancer treatment but faces challenges like photosensitizer self-quenching and limited reactive oxygen species (ROS) diffusion.
• Nanocarriers can improve photosensitizer delivery to tumors, yet optimizing PDT efficacy remains crucial.

Purpose of the Study:

• To design and evaluate a light-responsive nanocarrier system for enhanced photodynamic therapy (PDT) of prostate cancer.
• To investigate a wirelessly activated light-emitting diode (LED) implant for controlled photosensitizer release and PDT activation in deep tissues.

Main Methods:

• Synthesized a light-responsive polymer, (Polyethylene glycol)-block-poly(4,5-dimethoxy-2-nitrobenzylmethacrylate) (PEG-b-PNBMA), to create a smart nanocarrier (RB-M) loaded with Rose Bengal lactone (RB) photosensitizer.
• Developed a wirelessly activated LED implant for sequential light delivery to trigger photosensitizer release and subsequent PDT activation.
• Tested the RB-M system on 2D 22RV1 prostate cancer cells and 3D cancer cell spheroids using specific irradiation protocols (405-580 nm).

Main Results:

• The RB-M nanocarrier system, combined with sequential '405-580 nm' irradiation, demonstrated significant PDT efficacy against 2D and 3D prostate cancer models.
• The smart nanocarrier design and wireless activation strategy successfully overcame limitations associated with photosensitizer self-quenching and ROS diffusion.
• The system achieved controlled photosensitizer release and programmatic PDT activation, particularly effective under deep tissue conditions.

Conclusions:

• The developed light-responsive nanocarrier platform (RB-M) with a wireless LED implant offers a promising strategy for enhancing controllable photodynamic therapy.
• This approach effectively addresses key challenges in PDT, including light penetration and photosensitizer aggregation, leading to improved therapeutic outcomes.
• The technology holds potential for treating cancer patients, especially those unsuitable for traditional chemotherapy, by enabling effective deep-tissue PDT.