Cytotoxic rhodium(III) and iridium(III) polypyridyl complexes: structure-activity relationships, antileukemic activity, and apoptosis induction.

Abstract:

:Meridional rhodium(III) polypyridyl complexes of the type mer-[RhX(3)(DMSO)(pp)] (X=Cl, pp=phen 1, dpq 2, dppz 3; X=Br, pp=phen 4) represent a promising class of potent cytostatic agents for the treatment of lymphoma and leukemia. Exposure of their DMSO solutions to light leads to slow isomerization to mixtures of the mer and the generally less active fac isomers. As a result, the IC(50) values of 1 and 2 toward HT-29 cells increase from 0.19 and 0.069 microM on immediate use in the dark to 0.66 and 0.312 microM, respectively, after exposure of their DMSO stock solutions to light for 7 days. In striking contrast, the complexes mer-[IrX(3)(DMSO)(phen)] (X=Cl 7, Br 8) are significantly less cytotoxic than their facial Ir(III) polypyridyl counterparts: IC(50)=20.3 microM for 7 and 4.6 microM for fac-[IrCl(3)(DMSO)(phen)] 5 toward MCF-7 cells. The IC(50) values for the complexes fac-[IrX(3)(L)(pp)] 9-13 decrease in the orders: a) Cl>Br for X and b) H(2)O>DMSO for L. Specific apoptotic cell death by DNA fragmentation was detected for leukemia (NALM-6) and lymphoma (BJAB) cells after incubation with 2, 3, and 11 (X=Br, L=H(2)O, pp=phen) for 72 h. Loss of the mitochondrial membrane potential in lymphoma cells indicates that apoptosis is mediated via the intrinsic mitochondrial pathway. LDH release assays after 1 or 3 h demonstrate that necrotic damage is negligible.

journal_name

ChemMedChem

journal_title

ChemMedChem

authors

Dobroschke M,Geldmacher Y,Ott I,Harlos M,Kater L,Wagner L,Gust R,Sheldrick WS,Prokop A

doi

10.1002/cmdc.200800311

subject

Has Abstract

pub_date

2009-02-01 00:00:00

pages

177-87

issue

2

eissn

1860-7179

issn

1860-7187

journal_volume

4

pub_type

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