4.6 Article

Phosphorescent Polymeric Nanoparticles by Coordination Cross-Linking as a Platform for Luminescence Imaging and Photodynamic Therapy

期刊

CHEMISTRY-A EUROPEAN JOURNAL
卷 20, 期 49, 页码 16242-16247

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201404346

关键词

iridium; luminescence imaging; nanoparticles; phosphorescence; photodynamic therapy

资金

  1. National Natural Science Foundation of China [21271130, 21371122]
  2. Program for Changjiang Scholars and Innovative Research Team in University [IRT1269]
  3. Shanghai Science and Technology Development Fund [12ZR1421800, 13520502800]
  4. Shanghai Pujiang Program [13J1406600]
  5. Shanghai Municipal Education Commission [13ZZ110, 14YZ073]
  6. Shanghai Normal University [DXL122, SK201339]
  7. Internation Joint Laboratory on Resource Chemistry (IJLRC)

向作者/读者索取更多资源

Water-soluble phosphorescent polymeric nanoparticles with an average diameter of approximately 100nm were synthesized by a coordination cross-linking reaction. The pyridine blocks in poly(4-vinyl pyridine-b-ethylene oxide) (P4VP-b-PEO) were cross-linked by the iridium chloride-bridged dimer in DMF solution. Owing to the presence of an iridium complex with different ligands in the core of the polymeric nanoparticles, NP-1, NP-2, and NP-3 showed bright green, yellow, and red phosphorescence, respectively. PEG chains in the shell gave the polymeric nanoparticles solubility and biocompatibility, which was confirmed by an MTT assay using HeLa cells as a model cancer cell line. The flow cytometry and laser confocal fluorescence microscopy results revealed NP-2, as an example, could be effectively uptaken by HeLa cells. Therefore, these polymeric nanoparticles can be used as luminescent probes for living cells. In addition, O-1(2) could be effectively generated in the presence of NP-2 upon irradiation with visible light (>400nm, 300mWcm(-2)), which was confirmed by a clear decrease in the fluorescence intensity of 9,10-dimethylanthracene (DMA). After incubation with NP-2 at a concentration of 200gmL(-1) for 6h, approximately 90% of HeLa cells were effectively ablated upon irradiation with visible light for only 10min, indicating the potential for photodynamic therapy with polymeric nanoparticles.

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