Add time:07/27/2019         Source:sciencedirect.com

Nanotheranostics has gained increasing interest, as it offers a great potential to realize personalized diagnostics and therapy. In this work, we report a facile approach of the fabrication of gold nanostars (GNS) attached with matrix metalloproteinases (MMP2) polypeptides (Ac-GPLGIAGQ) and IR-780 iodide through bovine serum albumin (BSA) for targeted dual-modal photoacoustic (PA)/near-infrared (NIR) fluorescence imaging and enhanced photothermal therapy (PTT)/photodynamic therapy (PDT) for lung cancer. MMP2 polypeptides served as the targeting ligand, IR-780 iodide functioned as the NIR fluorescence imaging agent as well as PTT/PDT agent, and GNS acted as the carrier of IR-780 molecules and performed PA imaging and PTT. DLS and CCK-8 assay demonstrated that the nanoprobes ([email protected]/I-MMP2) exhibited excellent stability and biocompatibility under physiological conditions. Subsequent in vitro studies verified that [email protected]/I-MMP2 nanoparticles (NPs) were effectively internalized by A549 cancer cells and exhibited remarkable antitumor efficacy. Furthermore, [email protected]/I-MMP2 NPs could specifically target the tumor and significantly suppress the tumor growth, and their antitumor effects were mainly through the synergistic effects of PDT and PTT based on IR-780 and GNS. These findings imply the potential of [email protected]/I-MMP2 NPs as a targeting PA/NIR probe in tumor diagnosis and combined therapy with a single light source.

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