pH-Sensitive Porphyrin Metal-Organic Frameworks for Controlled Delivery of Para-Toluenesulfonamide and Photodynamic Cancer Therapy.

Introduction: Photodynamic therapy (PDT) is a promising approach for tumor treatment. PDT for treating lung squamous cell carcinoma (LSCC) under the guidance of bronchoscopy has great potential for development. However, the use of high-intensity lasers in treatment may pose a risk of tissue damage. To address this issue, enhancing the sensitivity of tumor tissue to phototherapy is highly valuable.

Methods: In this study, a simple method was employed to prepare porphyrin-metal framework nanoparticles (NPs), referred to as HA-PTS@PCN. The design of these NPs is based on the concept of tumor sensitization, constructed with the porphyrin-based metal-organic framework compound PCN-224 to load the drug para-toluenesulfonamide (PTS).

Results: Multiple experiments have demonstrated that these NPs can be effectively absorbed and selectively release PTS within the acidic tumor microenvironment. Under 660 nm laser irradiation, the material releases reactive oxygen species, demonstrating effective photodynamic therapeutic effects. Additionally, due to the tumor-sensitizing properties of PTS, the treatment efficacy of these NPs on LSCC is significantly greater than that of PCN-224 alone. Both in vitro and in vivo studies confirmed that combining tumor sensitization strategies with PDT therapy for LSCC significantly enhances anticancer effects.

Discussion: This study provides a universal strategy for preparing drug-loaded PDT nanoplatforms and offers a new approach for developing nanomedicine with tumor-sensitizing effects.