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Platinum Nanoparticles Regulated V2C MXene Nanoplatforms with NIR?II Enhanced Nanozyme Effect for Photothermal and Chemodynamic Anti?Infective Therapy

Constructing a nanoplatform based on Pt NPs anchored on V2C MXene (Pt@V2C), with excellent photothermal enhanced nanozyme strategy. Moreover, Pt@V2C is successfully applied to models of deep?seated subcutaneous infection and bacterial keratitis, and its therapeutic mechanism is analyzed through transcriptomics, laying the groundwork for the clinical application of V2C MXene with dual agents of photothermal and nanozymes.Given the challenge of multidrug resistance in antibiotics, non?antibiotic–dependent antibacterial strategies show promise for anti?infective therapy. V2C MXene?based nanomaterials have demonstrated strong biocompatibility and photothermal conversion efficiency (PCE) for photothermal therapy (PTT). However, the limitation of V2C MXene's laser irradiation to the near?infrared region I (NIR?I) restricts tissue penetration, making it difficult to achieve complete bacterial eradication with single?effect therapeutic strategies. To address this, Pt nanoparticles (Pt NPs) are attached to V2C, forming artificial nanoplatforms (Pt@V2C). Pt@V2C exhibits enhanced PCE (59.6%) and a longer irradiation laser (NIR?II) due to the surface plasmon resonance effect of Pt NPs and V2C. Notably, Pt@V2C displays dual enzyme?like activity with chemodynamic therapy (CDT) and NIR?II enhanced dual enzyme?like activity. The biocatalytic mechanism of Pt@V2C is elucidated using density functional theory. In an in vivo animal model, Pt@V2C effectively eliminates methicillin?resistant Staphylococcus aureus from deep?seated tissues in subcutaneous abscesses and bacterial keratitis environments, accelerating abscess resolution and promoting wound and cornea healing through the synergistic effects of PTT/CDT. Transcriptomic analysis reveals that Pt@V2C targets inflammatory pathways, providing insight into its therapeutic mechanism. This study presents a promising therapeutic approach involving hyperthermia?amplified biocatalysis with Pt NPs and MXene nanocomposites.

Publication date: 19/03/2024

Advanced Materials


This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 870292.