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Synthesis, DNA cross-linking activity, and cytotoxicity of dimeric mitomycins.

Abstract：

:Dimeric DNA cross-linking compounds have emerged as important new antitumor agents. We report the synthesis and biochemical evaluation of a select set of dimeric mitomycins in which the two mitomycin units are tethered at either the mitomycin C(7) amino or the aziridine N(1a) positions. Significantly, mitomycin C (1) itself is the prototypical bioreductive DNA cross-linking agent. DNA cross-linking experiments using a denaturing-gel-electrophoresis-based assay showed that the extent of DNA cross-linking for select dimeric mitomycins can exceed that of the parent compound, mitomycin C, and that the reaction proceeds, in part, at the two distal C(1) sites in the mitomycins. The efficiency of DNA cross-linking depended on the nature of the linker and the position of linker unit's attachment. When we compared the efficiency of DNA cross-linking for the dimeric mitomycins with their in vitro cytotoxicities in cultured human tumor cells, we observed a poor correlation. The mitomycins that gave the highest levels of DNA cross-linked adducts displayed the weakest cytotoxicities. These findings determined that the denaturing-gel-electrophoresis-based assay was a poor predictor of cytotoxic activity.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Na Y,Li VS,Nakanishi Y,Bastow KF,Kohn H

doi

10.1021/jm010090y

keywords:

subject

Has Abstract

pub_date

2001-10-11 00:00:00

pages

3453-62

issue

21

eissn

0022-2623

issn

1520-4804

pii

jm010090y

journal_volume

44

pub_type

杂志文章

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