Background: Breast cancer (BC) is the most common type of cancer affecting females. It is also a leading cause of cancer-related death in women worldwide.
Methods: Sonodynamic therapy (SDT) is an emerging therapeutic strategy for cancer treatment. SDT ensures non-invasive penetration of deep tumors and results in activation of non-toxic sonosensitizers administered in deep tumor sites to become cytotoxic. It has been reported that 2-dodecyl-6-methoxycyclohexa-2,5-diene-1,4-dione (DMDD) has a significant anti-tumor effect against various cancer types including BC. However, DMDD is hydrophobic. Therefore, a one-step encapsulation method was used in the current study to construct zeolitic imidazole frameworks-8 (ZIF-8) loaded with DMDD and sonosensitizer chlorin e6 (Ce6). ZIF-8 was further modified by coating it with a biomimetic cell membrane to improve targeted delivery.
Results: In vitro and in vivo results indicated that the nanomedicines had great biocompatibility properties and targeting ability. The nanocomposite exhibited a higher release rate under an acidic tumor microenvironment. The tumor killing effect of reactive oxygen species (ROS) generated from Ce6 and inhibition of tumor growth was enhanced after ultrasound (US) treatment, which might be caused by the increase in apoptosis rate.
Conclusions: These findings show that the combination of nanomedicine and SDT provides a potential therapeutic method for BC.
Keywords: 2-dodecyl-6-methoxycyclohexa-2,5-diene-1,4-dione (DMDD); Breast cancer (BC); ZIF-8 nanoparticles; metal-organic framework; sonodynamic therapy.
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