The interaction between Cu^II, Fe^III and Mn^II complexes, derived from the ligands 1-[bis(pyridine-2-ylmethyl)amino]-3-chloropropan-2-ol (hpclnol) and bis(pyridine-2-ylmethyl)amine (bpma), and the free radical 2,2-diphenyl-1-(2,4,6-trinitrophenyl)hydrazyl (DPPH) and reactive oxygen species (ROS), was investigated by colorimetric and EPR (Electron Paramagnetic Resonance) techniques. A comparison between these results and those reported to [Mn(salen)Cl] or EUK-8 was also addressed. EPR studies allowed us the identification of intermediates species such as superoxide‑copper(I) and superoxide‑copper(II), a mixed-valence Fe^IIIFe^II species and a 16-line feature attributed to Mn^III-oxo-Mn^IV species. The biomarker malondialdehyde (MDA) was determined by TBARS assay in S. cerevisiae cells, and the determination of the IC₅₀ indicate that the antioxidant activity shown dependence on the metal center (Cu^II ≈ Fe^III > Mn^II ≈ [Mn(salen)Cl]. The lipid peroxidation attenuation was also investigated in liver homogenates obtained from Swiss mice and the IC₅₀ values were in the nanomolar concentrations. We demonstrated here that all the complexes interact with the free radical DPPH and with ROS (H₂O₂, O₂^•- and hydroxyl radical), enhancing the cellular protection against oxidative stress generated by hydroxyl radical, employing two experimental model systems, S. cerevisiae (in vivo) and mouse liver (ex vivo).

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Journal Article | Research Support, Non-U.S. Gov't

Authors

Menezes LB, Segat BB, Tolentino H, Pires DC, Mattos LMM, Hottum HM, Pereira MD, Latini A, Horn A, Fernandes C

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