Cell-selective, apoptosis-inducing rhodium(III) crown thiaether complexes.

Abstract:

:Half-sandwich rhodium(III) polypyridyl (pp) complexes with the metal atom capped by the facial crown thiaether 1,4,7-trithiacyclononane [9]aneS(3) represent a promising class of apoptosis-inducing potent cytostatic agents. The necrotic damage caused by the complexes is negligible. In vitro cytotoxicity assays with the human cancer cell lines MCF-7 and HT-29 and immortalized HEK-293 cells indicate that the dicationic kappa(2)N(imino) complexes [([9]aneS(3))RhCl(pp)](2+) are much more active than monocationic complexes [([9]aneS(3))RhCl(2)(L)](+) (L=imidazole, CH(3)CN). Whereas the kappa(2)N(amino) complex [([9]aneS(3))RhCl(piperazine)](2+) is inactive, replacing piperazine with the structurally analogous kappa(2)S (thiaether) ligand 1,4-dithiane restores cytotoxicity as evidenced by IC(50) values in the range 8.1-11.6 microM. Spectroscopic (CD, UV/Vis, NOESY) and viscosity measurements indicate that the active dppz complex 8 (IC(50) values: 4.7-8.9 microM) exhibits strong intercalative binding towards DNA whereas the even more potent bipyrimidine complex 9 (IC(50) values: 0.6-1.9 microM) causes no alteration of the duplex B conformation. Weaker intercalative binding is observed for the dpq complex 7. A comparative annexin V-propidium iodide binding assay with lymphoma (BJAB) cells and healthy leukocytes demonstrates that the cytotoxic activity of complex 8 and particularly complex 9 is highly selective towards the malignant cells.

journal_name

ChemMedChem

journal_title

ChemMedChem

authors

Bieda R,Dobroschke M,Triller A,Ott I,Spehr M,Gust R,Prokop A,Sheldrick WS

doi

10.1002/cmdc.201000129

subject

Has Abstract

pub_date

2010-07-05 00:00:00

pages

1123-33

issue

7

eissn

1860-7179

issn

1860-7187

journal_volume

5

pub_type

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