A Nanoemulsion with A Porphyrin Shell for Cancer Theranostics

Area of Science:

• Nanotechnology
• Materials Science
• Biomedical Engineering

Background:

• Nanoemulsions offer versatile platforms for drug delivery and imaging.
• Porphyrins possess unique optical properties suitable for photodynamic therapy (PDT) and imaging.
• Developing stimuli-responsive nanocarriers is crucial for targeted therapeutic applications.

Purpose of the Study:

• To create a novel nanoemulsion with a porphyrin shell (NewPS) for enhanced photodynamic therapy and imaging.
• To investigate the optical properties and colloidal stability of the NewPS system.
• To demonstrate the potential of NewPS for co-loading chemotherapeutics and guiding PDT.

Main Methods:

• Self-assembly of porphyrin salt around an oil core to form NewPS.
• Characterization of NewPS colloidal stability and optical properties (J-aggregates, Q-band).
• In vivo studies in mice bearing KB tumors using spectrally distinct photoacoustic and fluorescence imaging to monitor NewPS accumulation and disruption.

Main Results:

• NewPS exhibited excellent colloidal stability and tunable optical properties due to the porphyrin shell.
• The J-aggregate formation in the porphyrin shell led to a red-shifted Q-band with increased absorbance.
• Spectrally distinct photoacoustic (intact NewPS) and fluorescence (disrupted NewPS) signals allowed for real-time monitoring of NewPS in tumors.
• Co-loading with paclitaxel and substitution with Lipiodol demonstrated potential for combined therapy and CT contrast.

Conclusions:

• The NewPS system provides a stable and optically tunable platform for theranostics.
• The ability to monitor NewPS accumulation and disruption enables precise guidance of photodynamic therapy.
• NewPS holds promise for advanced drug delivery and image-guided cancer treatment.