Journal
JOURNAL OF BIOLOGICAL INORGANIC CHEMISTRY
Volume 17, Issue 3, Pages 409-423Publisher
SPRINGER
DOI: 10.1007/s00775-011-0864-x
Keywords
Thiosemicarbazone; Copper; Anticancer; Reactive oxygen species; Glutathione
Funding
- Austrian Science Fond (FWF) [L212-B11, P22072-B11]
- Austrian Science Fund (FWF) [P22072] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 22072] Funding Source: researchfish
Ask authors/readers for more resources
Intracellular generation of reactive oxygen species (ROS) via thiol-mediated reduction of copper(II) to copper(I) has been assumed as the major mechanism underlying the anticancer activity of copper(II) complexes. The aim of this study was to compare the anticancer potential of copper(II) complexes of Triapine (3-aminopyridine-2-carboxaldehyde thiosemicarbazone; currently in phase II clinical trials) and its terminally dimethylated derivative with that of 2-formylpyridine thiosemicarbazone and that of 2,2'-bipyridyl-6-carbothioamide. Experiments on generation of oxidative stress and the influence of biologically relevant reductants (glutathione, ascorbic acid) on the anticancer activity of the copper complexes revealed that reductant-dependent redox cycling occurred mainly outside the cells, leading to generation and dismutation of superoxide radicals resulting in cytotoxic amounts of H2O2. However, without extracellular reductants only weak intracellular ROS generation was observed at IC50 levels, suggesting that cellular thiols are not involved in copper-complex-induced oxidative stress. Taken together, thiol-induced intracellular ROS generation might contribute to the anticancer activity of copper thiosemicarbazone complexes but is not the determining factor.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available