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Delivery of Phosphorescent Anticancer Iridium(III) Complexes by Polydopamine Nanoparticles for Targeted Combined Photothermal-Chemotherapy and Thermal/Photoacoustic/Lifetime Imaging.

Recently, phosphorescent iridium complexes have demonstrated great potential as anticancer and imaging agents. Dopamine is a melanin-like mimic of mussel adhesive protein that can self-polymerize to form polydopamine (PDA) nanoparticles that demonstrate favorable biocompatibility, near-infrared absorption, and photothermal effects. Herein, PDA nanoparticles are functionalized with β-cyclodextrin (CD) substitutions, which are further assembled with adamantane-modified arginine-glycine-aspartic acid (Ad-RGD) tripeptides to target integrin-rich tumor cells. The thus formed PDA-CD-RGD nanoparticles can deliver a phosphorescent iridium(III) complexes LysoIr ([Ir(ppy)2 (l)]PF6 , ppy = 2-phenylpyridine, L = (1-(2-quinolinyl)-β-carboline) to form a theranostic platform LysoIr@PDA-CD-RGD. It is demonstrated that LysoIr@PDA-CD-RGD can be applied for targeted combined cancer photothermal-chemotherapy and thermal/photoacoustic/two-photon phosphorescence lifetime imaging under both in vitro and in vivo conditions. This work provides a useful strategy to construct multifunctional nanocomposites for the optimization of metal-based anticancer agents for further biomedical applications.

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