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• W2979832543 abstract "Aim Tryptophan is the sole precursor of both peripherally and centrally produced serotonin and kynurenine. In depressed patients, tryptophan, serotonin, kynurenine, and their metabolite levels remain unclear. Therefore, peripheral tryptophan and metabolites of serotonin and kynurenine were investigated extensively in 173 patients suffering from a current major depressive episode (MDE) and compared to 214 healthy controls (HC). Methods Fasting plasma levels of 11 peripheral metabolites were quantified: tryptophan, serotonin pathway (serotonin, its precursor 5‐hydroxytryptophan and its metabolite 5‐hydroxyindoleacetic acid), and kynurenine pathway (kynurenine and six of its metabolites: anthranilic acid, kynurenic acid, nicotinamide, picolinic acid, xanthurenic acid, and 3‐hydroxyanthranilic acid). Results Sixty (34.7%) patients were antidepressant‐drug free. Tryptophan levels did not differ between MDE patients and HC. Serotonin and its precursor (5‐hydroxytryptophan) levels were lower in MDE patients than in HC, whereas, its metabolite (5‐hydroxyindoleacetic acid) levels were within the standard range. Kynurenine and four of its metabolites (kynurenic acid, nicotinamide, picolinic acid, and xanthurenic acid) were lower in MDE patients. Conclusion Whilst the results of this study demonstrate an association between the metabolites studied and depression, conclusions about causality cannot be made. This study uses the largest ever sample of MDE patients, with an extensive assessment of peripheral tryptophan metabolism in plasma. These findings provide new insights into the peripheral signature of MDE. The reasons for these changes should be further investigated. These results might suggest new antidepressant therapeutic strategies." @default.
• W2979832543 created "2019-10-18" @default.
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• W2979832543 date "2019-11-02" @default.
• W2979832543 modified "2023-10-16" @default.
• W2979832543 title "Peripheral tryptophan, serotonin, kynurenine, and their metabolites in major depression: A case–control study" @default.
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• W2979832543 doi "https://doi.org/10.1111/pcn.12944" @default.
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