An Oxygen-Enriched Photodynamic Nanospray for Postsurgical Tumor Regression

Area of Science:

• Biomedical Engineering
• Photodynamic Therapy
• Nanotechnology

Background:

• Postoperative cancer recurrence and metastasis pose significant clinical challenges.
• Conventional photodynamic therapy (PDT) efficacy is often limited by insufficient intratumoral oxygen.
• Developing strategies to enhance oxygen availability is crucial for improving PDT outcomes.

Purpose of the Study:

• To develop an oxygen-enriched photodynamic nanospray for enhanced postoperative cancer treatment.
• To investigate the efficacy of a liposome-based nanospray combining indocyanine green (ICG) and perfluorooctyl bromide (PFOB).
• To evaluate the potential of this nanospray in inhibiting local tumor recurrence.

Main Methods:

• Formulation of liposomes encapsulating indocyanine green (ICG) and perfluorooctyl bromide (PFOB) into a nanospray (Lip-PFOB-ICG).
• Assessment of biocompatibility and photodynamic enhancement under near-infrared light.
• Evaluation of the nanospray's efficacy in a subcutaneous tumor recurrence model, focusing on oxygen supply enhancement.

Main Results:

• The developed Lip-PFOB-ICG nanospray demonstrated good biocompatibility.
• The nanospray significantly enhanced the photodynamic therapy effect by improving oxygen supply.
• Perfluorooctyl bromide (PFOB) facilitated continuous oxygen absorption, boosting energy transfer and inhibiting local tumor recurrence.

Conclusions:

• The oxygen-enriched photodynamic nanospray (Lip-PFOB-ICG) strategy shows promise for effective postoperative cancer therapy.
• This approach overcomes oxygen limitations in conventional PDT, offering a potential new avenue for clinical application.
• The combination of liposomes, ICG, and PFOB provides a synergistic effect for enhanced anti-cancer treatment.