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Updated: Apr 23, 2026

Simultaneous Quantification of Selected Kynurenines Analyzed by Liquid Chromatography-Mass Spectrometry in Medium Collected from Cancer Cell Cultures
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The kynurenine pathway is involved in bacterial meningitis

Leonam G Coutinho, Stephan Christen, Caroline L Bellac

    Journal of Neuroinflammation
    |October 3, 2014
    PubMed
    Abstract

    Insights

    The kynurenine pathway (KP) is activated in bacterial meningitis (BM), with elevated metabolites and cytokines in cerebrospinal fluid (CSF). This suggests the KP may modulate inflammation in BM.

    Area of Science:

    • Neuroscience
    • Immunology
    • Biochemistry

    Background:

    • Bacterial meningitis (BM) involves intense inflammation contributing to brain damage.
    • The kynurenine pathway (KP), implicated in neurological diseases, was previously studied in BM animal models.
    • Genetic variations in kynurenine aminotransferase II (KAT II) have been linked to BM immune responses.

    Purpose of the Study:

    • To investigate the KP's role in human BM by analyzing cerebrospinal fluid (CSF) metabolite concentrations.
    • To correlate KP metabolite levels with inflammatory markers in BM patients.
    • To compare these findings with aseptic meningitis (AM) and non-meningitis (NM) groups.

    Main Methods:

    • HPLC analysis of tryptophan (TRP), kynurenine (KYN), kynurenic acid (KYNA), and anthranilic acid (AA) in CSF samples.
    • Calculation of the KYN/TRP ratio as an index of indoleamine 2,3-dioxygenase (IDO) activity.
    • Cytokine measurement using multiplex assays and analysis of KYNA levels in relation to AADAT+401C/T genotypes.

    Main Results:

    • Elevated KYN, KYNA, AA, IDO activity, and cytokine levels were observed in BM patients' CSF.
    • Specific correlations were found between cytokines (INF-γ, IL-1Ra, TNF-α, IL-10) and KP metabolites/activity.
    • Higher KYNA levels were associated with the AADAT+401 C/T variant allele.

    Conclusions:

    • The KP appears to be activated in human bacterial meningitis.
    • KP metabolites and activity correlate with inflammatory markers in BM.
    • The KP may exert a downward modulatory effect on CSF inflammation during BM.

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