The design of cobalt (III) complexes of phenazine-1-carboxamides as prointercalators and potential hypoxia-selective cytotoxins
Perrin, L.C.; Wilson, W.R.; Denny, W.A.; McFadyen, W.D.
Anti-Cancer Drug Design 14(3): 231-241
1999
ISSN/ISBN: 0266-9536 PMID: 10500498 Document Number: 510985
A series of cobalt (III) complexes, (Co(Racac)2(L))+, have been prepared as potential hypoxia-selective prointercalator forms of the ligands L, where L is the cytotoxic DNA monointercalating ligands N-(2-((aminoethyl)amino)ethyl)-phenazine-1-carboxamide and N-(5-((aminoethyl)amino)pentyl)-phenazine-1-carboxamide or the potentially bis(intercalating) ligand bis(2-(phenazine-1-carboxamido)ethyl)-1,2-diaminoethane. The cobalt(III) complexes of the monointercalating ligands have significantly lower DNA binding affinity and cytotoxicity than the ligands themselves, indicating the potential utility of this prodrug approach for deactivation (and release under hypoxic conditions). However, the complexes showed only low hypoxic selectivity. The complex of the bis(intercalating) ligand also showed significantly lower DNA binding affinity than the free ligand, but in this case there was no attenuation of cytotoxicity.