Purpose: Triple-negative breast cancer (TNBC) is challenging to treat with traditional “standard of care” therapy due to the lack of targetable biomarkers and rapid progression to distant metastasis. Methods: We synthesized a novel combination regimen that included chemotherapy and photothermal therapy (PTT) to address this problem. Here, we tested a magnetic nanosystem (MNs-PEG/IR780-DOX micelles) loaded with the near-infrared (NIR) photothermal agent IR780 and doxorubicin (DOX) to achieve chemo-photothermal and boost antitumor immunity. Intraductal (i.duc) administration of MNs-PEG/IR780-DOX could increase the concentration of the drug in the tumor while reducing systemic side effects. Results: We showed more uptake of MNs-PEG/IR780-DOX by 4T1-luc cells and higher penetration in the tumor. MNs-PEG/IR780-DOX exhibited excellent photothermal conversion in vivo and in vitro. The release of DOX from MNs-PEG/IR780-DOX is pH-and temperature-sensitive. Facilitated by i.duc administration, MNs-PEG/IR780-DOX displayed antitumor effects and prevented distant organs metastasis under NIR laser (L) irradiation and magnetic field (MF)while avoiding DOX-induced toxicity. More importantly, MNs-PEG/IR780-DOX alleviated tumor immunosuppressive microenvironment by increasing tumor CD8+ T cells infiltration and reducing the proportion of myeloid-derived suppressor cells (MDSCs) and Tregs. Conclusion: Intraductal administration of pH-and temperature-sensitive MNs-PEG/IR780-DOX with L and MF had the potential for achieving minimally invasive, targeted, and accurate treatment of TNBC.
CITATION STYLE
Liu, J., Guo, L., Rao, Y., Zheng, W., Gao, D., Zhang, J., … Sun, S. (2022). In situ Injection of pH-and Temperature-Sensitive Nanomaterials Increases Chemo-Photothermal Efficacy by Alleviating the Tumor Immunosuppressive Microenvironment. International Journal of Nanomedicine, 17, 2661–2678. https://doi.org/10.2147/IJN.S367121
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