Kynurenine is the primary breakdown product of tryptophan.
- Kynurenine blood levels have been found higher in type 2 diabetes, obesity, CVD, ADHD in children, HOMA-IR.
- Higher kynurenine increases Treg cell differentiation via the AhR (aryl hydrocarbon receptor) pathway.
- Blood levels were lower in acute ischemic stroke patients, older age, adults with ADHD.
- Upregulation of other tryptophan breakdown enzymes KMO (Kynurenine monooxygenase) and KYNU (Kynureninase) may decrease kynurenine.
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