Synergistic Target-Attacking Tumor Cells and M2 Macrophages via a Triple-Responsive Nanoassembly for Complete...

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Research

Background:

• Tumor metastasis arises from complex interactions between cancer cells and the tumor microenvironment.
• Monotherapies often fail to completely block metastasis due to this intricate collaboration.
• Targeting both cancer cells and specific microenvironment components is crucial for effective anti-metastatic strategies.

Purpose of the Study:

• To design and evaluate a triple-responsive nanoassembly for synergistic anti-metastatic therapy.
• To target both tumor cells and M2 tumor-associated macrophages (TAMs) within the tumor microenvironment.
• To investigate the potential of this platform in reversing epithelial-mesenchymal transition (EMT) and inhibiting metastasis.

Main Methods:

• Synthesis of a reactive oxygen species (ROS)-responsive polyquaternium crosslinked with graphene oxide (GO) and apolipoprotein A-I.
• Development of protein-crowning polymeric GO nanoparticles for multimodal shielding and drug/siRNA delivery.
• Utilizing apolipoprotein A-I to target scavenger receptors on tumor cells and M2 TAMs.
• Evaluating targeted accumulation, cytotoxicity, and therapeutic efficacy in preclinical models.

Main Results:

• The nanoassembly demonstrated targeted accumulation and potent cytotoxicity against M2 TAMs and tumor cells.
• Elimination of M2 TAMs disrupted the Snail-enhancing transforming growth factor (TGF)-β signaling pathway.
• Combined Snail silencing and M2 TAMs elimination reversed EMT and inhibited metastasis.

Conclusions:

• The developed triple-responsive nanoassembly offers a promising synergistic therapeutic platform for metastatic cancer.
• Targeting the tumor microenvironment, specifically M2 TAMs, is a viable strategy to enhance anti-metastatic efficacy.
• This approach holds potential for overcoming limitations of current mono-interventions in cancer metastasis treatment.