(Metallo)porphyrins as Potent Phototoxic Anti‐Cancer Agents after Irradiation with Red Light. Issue 3 (24th November 2014)

• Record Type: Journal Article
• Authors: Antoni, Philipp M.; Naik, Anu; Albert, Ina; Rubbiani, Riccardo; Gupta, Susmita; Ruiz‐Sanchez, Pilar; Munikorn, Pornkanok; Mateos, José M.; Luginbuehl, Vera; Thamyongkit, Patchanita; Ziegler, Urs; Gasser, Gilles; Jeschke, Gunnar; Spingler, Bernhard
• Is Part Of: Chemistry. Volume 21:Issue 3(2015)
• Page Start: 1179
• Page End: 1183
• Publication Date: 2014-11-24
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201405470
• Languages: English
• ISSNs: 0947-6539

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Novel photoactive (metallo)porphyrins were synthesised and characterised. When irradiated with light at a wavelength greater than 600 nm, these porphyrins act as photosensitisers and show high cytotoxicity towards two different human cancer cell lines with IC₅₀ values down to 0.4 μ<sc>M</sc>. A paramagnetic copper(II) porphyrin is the first photosensitiser to display excellent phototoxicity, explained by the electron paramagnetic resonance (EPR) spin trapping of hydroxy radicals and experimentally confirmed by the discovery of elevated levels of reactive oxygen species (ROS) inside A2780 cells after irradiation with red light. This finding indicates that paramagnetic compounds should be considered for photodynamic therapy (PDT). Furthermore, an additive effect of cisplatin and a zinc porphyrin, both at subtherapeutic concentrations of 0.22 μ<sc>m, </sc> was observed.</p> </abstract>