Planta Med 2012; 78(12): 1342-1350
DOI: 10.1055/s-0032-1315020
Biological and Pharmacological Activities
Original Papers
Georg Thieme Verlag KG Stuttgart · New York

Effects of Curcumin on Nitrosyl-Iron Complex – Mediated DNA Cleavage and Cytotoxicity

Rong-Jen Shiau
1   Department of Beauty Science, Chienkuo Technology University, Changhua, Taiwan
,
Jheng-Yu Wu
2   Department of Biology, National Changhua University of Education, Changhua, Taiwan
,
Show-Jen Chiou
3   Department of Applied Chemistry, National Chiayi University, Chiayi, Taiwan
,
Yu-Der Wen
2   Department of Biology, National Changhua University of Education, Changhua, Taiwan
› Author Affiliations
Further Information

Publication History

received 25 April 2012

accepted 07 June 2012

Publication Date:
06 July 2012 (online)

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Abstract

Combination therapy aims to improve the pharmaceutical efficacy of different drugs, thus lowering the dosages used and reducing the side effects. However, interactions between individual drugs may also occur and lead to uncertain consequences. This study demonstrated that curcumin, a natural phenolic compound found in the rhizomes of turmeric, could either inhibit or enhance DNA cleavage caused by the synthetic nitrosyl-iron complex NC10 ([Fe2(C2H5OS)2(NO)4]). Without UV irradiation, higher concentrations of curcumin protected DNA from being cleaved by NC10. Conversely, in the presence of lower concentrations of curcumin (< 5 µM), cleaved DNA increased by raising curcumin concentrations. After UV irradiation, the DNA protective effect of curcumin decreased while the enhancing DNA cleavage effect of curcumin remained. UV/visible spectroscopy analysis showed that curcumin is associated with the iron of NC10, suggesting the formation of curcumin-Fe complexes. Furthermore, a cytotoxicity assay revealed that cotreatment of NC10 and curcumin had synergetic effects on the growth inhibition of mouse melanoma B16-F10 cells. To our knowledge, this is the first study of the cotreatment of curcumin with inorganic compounds that showed synergistic cytotoxicity.