Journal
CHEMBIOCHEM
Volume 21, Issue 4, Pages 531-542Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbic.201900419
Keywords
bioinorganic chemistry; medicinal inorganic chemistry; metal-based drugs; metals in medicine; photodynamic therapy
Funding
- ERC (Consolidator Grant PhotoMedMet) [GA 681679]
- program Investissements d'Avenir [ANR-10-IDEX-0001-02 PSL]
- Helmholtz Initiative and Networking Fund (Functional Nanomaterials for Multimodality Cancer Imaging (NanoTracking)) [VH-VI421]
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There is a current surge of interest in the development of novel photosensitizers (PSs) for photodynamic therapy (PDT), as those currently approved are not completely ideal. Among the tested compounds, we have previously investigated the use of Ru-II polypyridyl complexes with a [Ru(bipy)(2)(dppz)](2+) and [Ru(phen)(2)(dppz)](2+) scaffold (bipy=2,2 '-bipyridine; dppz=dipyrido[3,2-a:2 ',3 '-c]phenazine; phen=1,10-phenanthroline). These complexes selectively target DNA. However, because DNA is ubiquitous, it would be of great interest to increase the selectivity of our PDT PSs by linking them to a targeting vector in view of targeted PDT. Herein, we present the synthesis, characterization, and in-depth photophysical evaluation of a nanobody-containing Ru-II polypyridyl conjugate selective for the epidermal growth factor receptor (EGFR) in view of targeted PDT. Using ICP-MS and confocal microscopy, we could demonstrate that our conjugate has high selectivity for the EGFR receptor, which is a crucial oncological target because it is overexpressed and/or deregulated in a variety of solid tumors. However, in contrast to expectations, this conjugate was found to not produce reactive oxygen species (ROS) in cancer cells and is therefore not phototoxic.
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