Towards Novel Photodynamic Anticancer Agents Generating Superoxide Anion Radicals: A Cyclometalated IrIIIComplex Conjugated to a Far‐Red Emitting Coumarin
Open Access
- 19 March 2019
- journal article
- research article
- Published by Wiley in Angewandte Chemie-International Edition
- Vol. 58 (19), 6311-6315
- https://doi.org/10.1002/anie.201901268
Abstract
Although cyclometalated Ir(III) complexes have emerged as promising photosensitizers for photodynamic therapy, some key drawbacks still hamper clinical translation such as operability in the phototherapeutic window and ROS production efficiency and selectivity. In this work, we report a cyclometalated Ir(III) complex conjugated to a far‐red emitting coumarin with highly favourable properties for cancer phototherapy. Ir(III)‐COUPY was efficiently taken up by living HeLa cells and showed no dark cytotoxicity and impressive photocytotoxicity indexes after blue (161) and green (85) light irradiation, even under hypoxia. Importantly, a clear correlation between cell death and intracellular superoxide anion radicals’ generation after visible light irradiation was demonstrated. By taking advantage of the rich photophysical properties of COUPY fluorophores and of the well‐stablished anticancer activities of Ir(III) complexes, this strategy opens the door to novel fluorescent PDT agents with promising applications in theragnosis.Keywords
Funding Information
- Departament d'Universitats, Recerca i Societat de la Informació (2017 FI_B 00617, 2018 FI_B1 00174 and 2019 FI_B2 00167, 2017 DI 072)
- Ministerio de Economía, Industria y Competitividad, Gobierno de España (CTQ2015-64319-R, CTQ2017-84779-R, CTQ2014-52658-R, CTQ2016-78454-C2-1-R)
- Grantová Agentura České Republiky (18-09502S)
- Universidad de Murcia (R-1034/2016)
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