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IDO Activity (Tryptophan/Kynurenine ratio)
IDO (indoleamine 2,3-dioxygenase) activity indicates the rate at which the amino acid tryptophan is converted into kynurenine. This pathway is regulated by immune and inflammatory signals, particularly cytokines such as interferon-γ. An increased IDO activity (low tryptophan/kynurenine ratio) may signal immune activation, chronic inflammation, or oxidative stress. Balanced IDO activity suggests normal immune regulation and sufficient tryptophan availability for serotonin and melatonin synthesis.
Description
What does IDO activity indicate?
IDO (indoleamine 2,3-dioxygenase) activity indicates the rate at which the amino acid tryptophan is converted into kynurenine. This pathway is closely associated with immune regulation and inflammation, as it is triggered by cytokines such as interferon-γ.
What might heightened IDO activity suggest?
Higher IDO activity (which corresponds to a lower tryptophan/kynurenine ratio) may indicate immune activation, chronic inflammation, infection, or oxidative stress. It suggests that tryptophan is being diverted from serotonin synthesis towards immune-related metabolic pathways.
What might a lower IDO activity suggest?
Low IDO activity (a higher tryptophan/kynurenine ratio) may indicate reduced immune activation or low inflammatory signalling. It can also suggest sufficient tryptophan availability for serotonin and melatonin synthesis.
How can IDO balance be supported?
Supporting balanced immune and inflammatory function is essential. Adequate antioxidant intake, stress reduction, and maintaining healthy gut and immune function may help regulate IDO activity. Ensuring sufficient dietary tryptophan and cofactors such as B vitamins and magnesium supports optimal tryptophan metabolism.
