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• W2769562420 abstract "Abstract Background The neuroimmunological kynurenine pathway (KP) has been hypothesized to play a role in depressive/anhedonic symptoms and related CNS disturbances. Indoleamine 2,3-dioxygenase (IDO) is the rate limiting enzyme which leads to neurotrophic [kynurenic acid (KA)] and neurotoxic [Quinolinic acid (QUIN)] branches. In this pilot, we sought to examine associations between blood KP neuro-toxic/trophic measures and anhedonia/depression associated networks in youth with major depression (MDD) and healthy controls (HC). Methods Subjects were 14 psychotropic-medication free adolescents with MDD and 7 HC, ages 12–19 yo. All underwent resting-state functional magnetic resonance imagining (fMRI) scans. Voxel-wise maps were generated indicating correlation strengths among 4 bilateral seeds [(dorsal anterior cingulate cortex (dACC), perigenual ACC (pgACC), subgenual ACC (sgACC) and nucleus accumbens (NAc)] and remaining brain regions. FMRI analyses were family-wise error corrected. KP metabolites were measured using liquid chromatography–tandem mass spectrometry. Results Connectivity between the right dACC and the right precuneus was positively correlated with KA levels. This same cluster demonstrated an inverse correlation with IDO activity. Exploratory analysis at a more liberal clustering threshold showed the KA/QUIN ratio was positively correlated with connectivity between the pgACC and the right medial prefrontal cortex. Lastly, connectivity between the pgACC and the left inferior temporal gyrus was positively correlated with QUIN levels. Limitations Findings are preliminary due to the small sample size. Conclusions This pilot study is the first report in depressed adolescents demonstrating associations between the KP and anhedonia/depression-associated brain networks. This pilot adds evidence to the putative role of the KP in MDD." @default.
• W2769562420 created "2017-12-04" @default.
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• W2769562420 date "2018-02-01" @default.
• W2769562420 modified "2023-10-17" @default.
• W2769562420 title "A pilot resting-state functional connectivity study of the kynurenine pathway in adolescents with depression and healthy controls" @default.
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• W2769562420 doi "https://doi.org/10.1016/j.jad.2017.11.040" @default.
• W2769562420 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5805652" @default.
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