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Macrocyclic copper(II) complexes

2007Artigo científico Apenas metadados
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dc.contributor.authorFernandes, Ana S.
dc.contributor.authorGaspar, Jorge
dc.contributor.authorCabral, M. Fatima
dc.contributor.authorCaneiras, Catia
dc.contributor.authorGuedes, Rita
dc.contributor.authorRueff, Jose
dc.contributor.authorCastro, Matilde
dc.contributor.authorCosta, Judite
dc.contributor.authorOliveira, Nuno G.
dc.date.accessioned2015-12-30T10:17:54Z
dc.date.available2015-12-30T10:17:54Z
dc.date.issued2007
dc.description.abstractSynthetic superoxide dismutase mimetics have emerged as a potential novel class of drugs for the treatment of oxidative stress related diseases. Among these agents, metal complexes with macrocyclic ligands constitute an important group. In this work we synthesized five macrocyclic copper(II) complexes and evaluated their ability to scavenge the superoxide anions generated by the xanthine-xanthine oxidase system. Two different endpoints were used, the nitro blue tetrazolium (NBT) reduction assay (colorimetric method) and the dihydroethidium (DHE) oxidation assay (fluorimetric method). IC50 values in the low micromolar range were found in four out of five macrocyclic complexes studied, demonstrating their effective ability to scavenge the superoxide anion. The IC50 values obtained with the NBT assay for the macrocyclic copper(II) complexes, were consistently higher, approximately threefold, than those obtained with the DHE assay. Spectroscopic and electrochemical studies were performed in order to correlate the structural features of the complexes with their superoxide scavenger activity. Cytotoxicity assays were also performed using the MTT method in V79 mammalian cells and we found that the complexes, in the range of concentrations tested in the superoxide scavenging assays were not considerably toxic. In summary, some of the presented macrocyclic copper(II) complexes, specially those with a high stability constant and low IC50 appear to be promising superoxide scavenger agents, and should be considered for further biological assays. (c) 2007 Elsevier Inc. All rights reserved.
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dc.identifier.citationJOURNAL OF INORGANIC BIOCHEMISTRY. - Vol. 101, n. 5 (MAY 2007), p. 849-858
dc.identifier.doihttp://dx.doi.org/10.1016/j.jinorgbio.2007.01.013
dc.identifier.issn0162-0134
dc.identifier.urihttp://hdl.handle.net/10451/21301
dc.language.isoeng
dc.publisherELSEVIER SCIENCE INC
dc.subjectBiochemistry & Molecular Biology
dc.subjectChemistry, Inorganic & Nuclear
dc.titleMacrocyclic copper(II) complexes
dc.titleSuperoxide scavenging activity, structural studies and cytotoxicity evaluation
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage858por
oaire.citation.startPage849por
oaire.citation.titleJOURNAL OF INORGANIC BIOCHEMISTRYpor
oaire.citation.volumeVol. 101por
rcaap.rightsrestrictedAccess
rcaap.typearticle

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