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Detailed Biological Profiling of a Photoactivated and Apoptosis Inducing pdppz Ruthenium(II) Polypyridyl Complex in Cancer Cells.

Abstract：

:Ruthenium polypyridyl complexes show great promise as new photodynamic therapy (PDT) agents. However, a lack of detailed understanding of their mode of action in cells poses a challenge to their development. We have designed a new Ru(II) PDT candidate that efficiently enters cells by incorporation of the lipophilic aromatic pdppz ([2,3-h]dipyrido[3,2-a:2',3'-c]phenazine) ligand and exhibits photoactivity through incorporation of 1,4,5,8-tetraazaphenanthrene ancillary ligands. Its photoreactivity toward biomolecules was studied in vitro, where light activation caused DNA cleavage. Cellular internalization occurred via an energy dependent mechanism. Confocal and transmission electron microscopy revealed that the complex localizes in various organelles, including the mitochondria. The complex is nontoxic in the dark, with cellular clearance within 96 h; however, upon visible light activation it induces caspase-dependent and reactive-oxygen-species-dependent apoptosis, with low micromolar IC50 values. This investigation greatly increases our understanding of such systems in cellulo, aiding development and realization of their application in cancer therapy.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Cloonan SM,Elmes RB,Erby M,Bright SA,Poynton FE,Nolan DE,Quinn SJ,Gunnlaugsson T,Williams DC

doi

10.1021/acs.jmedchem.5b00451

subject

Has Abstract

pub_date

2015-06-11 00:00:00

pages

4494-505

issue

11

eissn

0022-2623

issn

1520-4804

journal_volume

58

pub_type

杂志文章

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