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  • Title: Superoxide-dependent reduction of free Fe(3+) and release of Fe(2+) from ferritin by the physiologically-occurring Cu(I)-glutathione complex.
    Author: Aliaga ME, Carrasco-Pozo C, López-Alarcón C, Olea-Azar C, Speisky H.
    Journal: Bioorg Med Chem; 2011 Jan 01; 19(1):534-41. PubMed ID: 21115254.
    Abstract:
    The intracellularly-occurring Cu(I)-glutathione complex (Cu(I)-[GSH](2)) has the ability to reduce molecular oxygen into superoxide radicals (O2·-). Based on such ability, we addressed the potential of this complex to generate the redox-active Fe(2+) species, during its interaction with free Fe(3+) and with ferritin-bound iron. Results show that: (i) the complex reduces free Fe(3+) through a reaction that totally depends on its O2·--generating capacity; (ii) during its interaction with ferritin, the complex reduces and subsequently releases iron through a largely (77%) SOD-inhibitable reaction; the remaining fraction is accounted for by a direct effect of GSH molecules contained within the complex. The O2·--dependent iron-releasing efficiency of the complex was half that of its iron-reducing efficiency; (iii) the ability of the complex to release ferritin-bound iron was increased, concentration-dependently, by the addition of GSH and totally prevented by SOD; (iv) in the presence of added H(2)O(2), the Fe(2+) ions generated through (i) or (ii) were able to catalyze the generation of hydroxyl radicals. Thus, the present study demonstrates the ability of the Cu(I)-[GSH](2) complex to generate the redox-active Fe(2+) species and suggest that by favouring the occurrence of superoxide-driven Fenton reactions, its pro-oxidant potential could be increased beyond its initial O2·--generating capacity.
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