Iron increases glutamate secretion by increasing cytosolic aconitase activity. The synthesis of isocitrate by cytosolic aconitase is the the first step in a three step synthesis of glutamate. Glutamate, arising from increases in cytosolic aconitase due to increases in iron, is secreted via the cystine/glutamate antiporter where at the same time cystine is imported into cells increasing glutathione levels in cells.
With iron supplementation in schizophrenia via iron carbonyl taken three times a day there could be increased glutamatergic neurotransmission via increases is secreted glutamate where at the same time there would be increases in cystine in cells and thereby increases in glutathione levels in cells. Supplementation with iron from iron carbonyl could be part the treatment of schizophrenia.