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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Comparative studies of oxindolimine-metal complexes as inhibitors of human DNA topoisomerase IB

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Castelli, Silvia [1] ; Goncalves, Marcos Brown [2] ; Katkar, Prafulla [1] ; Stuchi, Gabriela Cristina [3] ; Alves Couto, Ricardo Alexandre [3] ; Petrilli, Helena Maria [4] ; da Costa Ferreira, Ana Maria [3]
Total Authors: 7
[1] Univ Roma Tor Vergata, Dept Biol, Via Ric Sci, I-00133 Rome - Italy
[2] Univ Tecnol Fed Parana, Dept Fis, BR-80230901 Curitiba, PR - Brazil
[3] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo, SP - Brazil
[4] Univ Sao Paulo, Inst Fis, Dept Fis Mat & Mecan, BR-05508090 Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Inorganic Biochemistry; v. 186, p. 85-94, SEP 2018.
Web of Science Citations: 3

Copper(II) and zinc(II) complexes with oxindolimine ligands, obtained by a condensation reaction between isatin (1H-indole-2,3-dione) and 2-(2-aminoethyl)pyridine, have been previously shown to activate apoptosis very efficiently in different cancer cell lines. Here, we show that these compounds inhibit human DNA topoisomerase IB (Topo I) activity, and this characteristic may be implicated in its pro-apoptotic and potential antitumor properties. The studied metal complexes prevent DNA relaxation and cleavage reaction, whilst they do not have any effect on the religation process. The protein inhibition occurs in two different ways since the copper compound does not permit the enzyme-DNA complex formation, while the zinc analogue permits this complex formation but inhibits the catalytic cleavage reaction. Other related copper and zinc complexes, one with an asymmetric imine ligand derived from isatin, 1,3-diaminopropane, and salicyladehyde, and another one previously reported, derived from isatin and 1,3-diaminopropane, had their corresponding inhibition results towards Topo I compared. These data demonstrated that such complexes can act as good catalytic inhibitors of Topo I, in a process modulated by the ligand features and the nature of the metal ion. Computational studies complemented and supported experimental data, showing three different characteristics of the metal complexes that influence its interaction and consequent inhibition of Topo I. The ligand planarity when bound to the protein increases the occurring interactions in different binding sites, the total charge of the complex modulates the preferential region of interaction, and the copper(II) complexes are expected to be more efficient inhibitors compared to analogous zinc(II), as verified experimentally. (AU)

FAPESP's process: 11/50318-1 - Development of compounds with pharmacological or medicinal interest and of systems for their transport, detection and recognition in biological media
Grantee:Ana Maria da Costa Ferreira
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/07937-8 - Redoxome - Redox Processes in Biomedicine
Grantee:Ohara Augusto
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 12/03080-2 - Studies of interactions between copper complexes with antitumor activity and proteins kinases and topoisomerases
Grantee:Ana Maria da Costa Ferreira
Support type: Research Grants - Visiting Researcher Grant - International