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While the naturally occurring reducing agents glutathione (GSH) and ascorbate (H2A) alone are ineffective at reducing iron(III) sequestered by the siderophore ferrioxamine B, the addition of an iron(II) chelator, sulfonated bathophenanthroline (BPDS), facilitates reduction by either reducing agent. A mechanism is described in which a ternary complex is formed between ferrioxamine B and BPDS in a rapidly...
Elevation of cytosolic calcium levels has been shown to occur via oxidation of critical protein thiols in liver microsomes. Elevated cytosolic Ca 2+ may also result from activation of calcium releasing channels. In the presence of NADPH or ascorbic acid, iron ions produced a concentration-dependent release of calcium from liver microsomes. Under anaerobic conditions, the iron-induced...
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