Preparation of NIR-sensitive, photothermal and photodynamic multi-functional Mxene nanosheets for laryngeal cancer therapy by regulating mitochondrial apoptosis

Laryngeal cancer is the most common malignant tumor for which there is still a lack of effective treatment. Traditional radiotherapy, chemotherapy, and surgery all have significant side effects. Therefore, multifunctional collaborative therapeutic nanoplatforms are attractive to patients with laryngeal cancer. In this study, a near-infrared responsive IR780-modified MXene (Ti3C2) nanosheet was proposed as a strategy for targeted therapy to achieve the synergistic functions of photothermal (PTT) therapy, photodynamic (PDT) therapy and mitochondrial pathway apoptosis. Electron spin resonance results showed that Ti3C2@IR780 could produce singlet linear oxygen for PDT. Molecular biology studies showed that Ti3C2@IR780 had the outstanding ability to generate ROS to disrupt mitochondrial function, resulting in apoptosis of cancer cells up to 60.51%. In vivo experiments showed that Ti3C2@IR780 could effectively aggregate at tumor sites. The temperature of the tumor region could reach 63.7 °C in the presence of near-infrared light. Tumor growth was inhibited by 92% during the treatment, and there was no recurrence. Results of the sections showed an 88.1% reduction in microtumor vascularity with Ti3C2@IR780 treatment for 21 days compared to the control group. These findings suggest that this multifunctional nanoplatform with synergistic NIR-sensitive properties can effectively inhibit tumor growth, providing an ideal strategy for cancer treatment.