Unusual Reactivity of a Potent Platinum-Acridine Hybrid Antitumor Agent.

Unusual Reactivity of a Potent Platinum-Acridine Hybrid Antitumor Agent.
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DOI:
10.1021/ml200104h
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发表时间:
2011-09-08
影响因子:
4.2
通讯作者:
Bierbach, Ulrich
Bierbach, Ulrich
中科院分区:
医学3区
文献类型:
--
作者:
Graham, Leigh A.;Wilson, Gary M.;West, Tiffany K.;Day, Cynthia S.;Kucera, Gregory L.;Bierbach, Ulrich

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The formation of unusual seven-membered, sterically overloaded chelates [Pt(en)(L/L´)](NO3)2 (4a/4b) from the corresponding potent hybrid antitumor agents [PtCl(en)(LH/L´H)](NO3)2 (3a/3b) is described, where en is ethane-1,2-diamine and L(H) and L´(H) are (protonated) N-(2-(acridin-9-ylamino)ethyl)-N-methylpropionimidamide and N-(2-(acridin-9-ylamino)ethyl)-N-methylacetimidamide, respectively. Compounds 3a and 3b inhibit H460 lung cancer cell proliferation with IC50 values of 12 ± 2 nM and 2.8 ± 0.3 nM, respectively. The new derivative 3b proves to be not only the most cytotoxic platinum–acridine hybrid of this kind, but also one of the most potent platinum-based anticancer agents described to date. The chelates 4a and 4b do not undergo ligand substitution reactions with nucleobase nitrogen and cysteine sulfur and do not intercalate into DNA. Despite their inertness, the two chelates appear to maintain micromolar activity in H460 cells. The results are discussed in the context of potential DNA-mediated and DNA-independent cell kill mechanisms and the potential use of the chelates as prodrugs.
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