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NIR/Thermo-Responsive Injectable Self-Healing Hydrogel Containing Polydopamine Nanoparticles for Efficient Synergistic Cancer Thermochemotherapy.

Injectable and self-healing hydrogels with thermoresponsiveness as the smart hydrogel could achieve the injectability and heal automatically, and the phase and volume changes as well. Here, the thermoresponsive self-healing hydrogel was prepared via the dynamic covalent enamine bonds between the amino groups in polyetherimide (PEI) and the acetoacetate groups in four-armed star-shaped poly(2-(dimethylamino)ethyl methacrylate-co-2-hydroxyethyl methacrylate) modified with tertiary-butyl acetoacetate (t-BAA), SP(DMAEMA-co-HEMA-AA). After adding polydopamine nanoparticles (PDA NPs), the SP(DMAEMA-co-HEMA-AA)/PEI/PDA-NPs nanocomposite hydrogel presented phase change and volume shrinkage via NIR irradiation. The thermoresponsive nanocomposite hydrogel loading anti-cancer drug doxorubicin (DOX) could be injected to the 4T1 tumor by intratumoral injection. After NIR laser irradiation, the temperature of the hydrogel increased because of the photothermal effect of PDA NPs, induced local hyperthermia. Because the hydrophilicity-hydrophobicity transition of hydrogel occurred, DOX molecules were squeezed out from hydrogel at higher temperature than its lower critical solution temperature (LCST) and the tumor cells suffered from internal stress from the shrunk hydrogel. The injectable nanocomposite hydrogel not only demonstrated the synergism of highly efficient thermochemotherapy, but also showed the function of improving drug utilization and precise treatment to reduce the side effects of drugs.

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