Au-PLGA Hybrid Nanoparticles with Catalase-Mimicking and near-Infrared Photothermal Activities for Photoacoustic Imaging-Guided Cancer Therapy.

Imaging-guided diagnosis and therapy has been highlighted in the area of nanomedicines. However, integrating multiple functions with high performance in one theranostic ("all-in-one") still presents considerable challenges. Here, "all-in-one" nanoparticles with drug-loading capacity, catalase-mimetic activity, photoacoustic (PA) imaging ability and photothermal properties were prepared by decorating Au nanoparticles on doxorubicin (DOX) encapsulated poly(lactic--glycolic acid) (PLGA) vehicle. The results revealed that the as-prepared Au-PLGA hybrid nanoparticles possessed high photothermal conversion efficiency of up to approximately 69.0%, meanwhile their strong acoustic generation endowed them with efficient PA signal sensing for cancer diagnosis. On an 808 nm laser irradiation, the O generation, DOX release profile and reactive oxygen species (ROS) level were all improved, which were beneficial to relieving tumor hypoxia and enhanced the cancer chemo/PTT combined therapy. Overall, the multifunctional Au-PLGA hybrid nanoparticles with these integrated advantages shows promise in PA imaging-guided diagnosis and synergistic tumor ablation.