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Fabrication of ultrasmall WS 2 quantum dots-coated periodic mesoporous organosilica nanoparticles for intracellular drug delivery and synergistic chemo-photothermal therapy.

Introduction: The consolidation of different therapies into a single nanoplatform has shown great promise for synergistic tumor treatment. In this study, a multifunctional platform by WS2 quantum dots (WQDs)-coated doxorubicin (DOX)-loaded periodic mesoporous organosilicas (PMOs-DOX@WQDs) nanoparticles were fabricated for the first time, and which exhibits good potential for synergistic chemo-photothermal therapy.

Materials and methods: The structure, light-mediated drug release behavior, photothermal effect, and synergistic therapeutic efficiency of PMOs-DOX@WQDs to HCT-116 colon cancer cells were investigated. The thioether-bridged PMOs exhibit a high DOX loading capacity of 66.7 μg mg-1 . The gating of the PMOs not only improve the drug loading capacity but also introduce the dual-stimuli-responsive performance. Furthermore, the as-synthesized PMOs-DOX@WQDs nanoparticles can efficiently generate heat to the hyperthermia temperature with near infrared laser irradiation.

Results: It was confirmed that PMOs-DOX@WQDs exhibit remarkable photothermal effect and light-triggered faster release of DOX. More importantly, it was reasonable to attribute the efficient anti-tumor efficiency of PMOs-DOX@WQDs.

Conclusion: The in vitro experimental results confirm that the fabricated nanocarrier exhibits a significant synergistic effect, resulting in a higher efficacy to kill cancer cells. Therefore, the WQD-coated PMOs present promising applications in cancer therapy.

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