Phototoxic Activity and DNA Interactions of Water-Soluble Porphyrins and Their Rhenium(I) Conjugates

ChemMedChem
Giuliana MionEnzo Alessio

Abstract

In the search for alternative photosensitizers for use in photodynamic therapy (PDT), herein we describe two new water-soluble porphyrins, a neutral fourfold-symmetric compound and a +3-charged tris-methylpyridinium derivative, in which either four or one [1,4,7]-triazacyclononane (TACN) units are connected to the porphyrin macrocycle through a hydrophilic linker; we also report their corresponding tetracationic Re(I) conjugates. The in vitro (photo)toxic effects of the compounds toward the human cell lines HeLa (cervical cancer), H460M2 (non-small-cell lung carcinoma), and HBL-100 (non-tumorigenic epithelial cells) are reported. Three of the compounds are not cytotoxic in the dark up to 100 μm, and the fourfold-symmetric couple revealed very good phototoxic indexes (PIs). The intracellular localization of all derivatives was studied in HeLa cells by confocal fluorescence microscopy. Although low nuclear localization was observed for some of them, it still prompted us to investigate their capacity to bind both quadruplex and duplex DNA; we observed significant selectivity in the tris-methylpyridinium derivatives for G-quadruplex interactions.

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Citations

Feb 11, 2016·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·William I O'MalleyBim Graham
Jun 14, 2017·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Michael Luciano, Christian Brückner
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Feb 7, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Letícia QuentalAntónio Paulo
Jul 3, 2021·Pharmaceuticals·Elisa PalmaAntónio Paulo

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