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We further demonstrated that itaconate attenuates reductive carboxylation at IDH2, restricting its own production and the accumulation of the immunomodulatory metabolites citrate and 2-hydroxyglutarate. In line with this, reductive carboxylation is enhanced in ACOD1-depleted macrophages. Mechanistically, the inhibition of IDH2 by itaconate is linked to the alteration of the mitochondrial NADP+/NADPH ratio and competitive succinate dehydrogenase inhibition. Taken together, our findings extend the current model of TCA cycle reprogramming
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