Characterisation of kynurenine pathway metabolism in human astrocytes and implications in neuropathogenesis

G. J. Guillemin, D. G. Smith, S. J. Kerr, G. A. Smythe, V. Kapoor, P. J. Armati, B. J. Brew

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)

Abstract

The role of astrocytes in the production of the neurotoxin quinolinic acid (QUIN) and other products of the kynurenine pathway (KP) is controversial. Using cytokine-stimulated human astrocytes, we assayed key enzymes and products of the KP. We found that astrocytes lack kynurenine-hydroxylase so that large amounts of kynurenine (KYN) and kynurenic acid (KYNA) were produced, while minor amounts of QUIN were synthesised that were completely degraded. We then showed that kynurenine added to macrophages led to significant production of QUIN. These results suggest that astrocytes alone are neuroprotective by minimising QUIN production and maximising synthesis of KYNA. However, it is likely that, in the presence of macrophages and/or microglia, astrocytes are neurotoxic by producing large concentrations of KYN that can be metabolised by neighbouring monocytic cells to QUIN.

Original languageEnglish
Pages (from-to)108-111
Number of pages4
JournalRedox Report
Volume5
Issue number2-3
Publication statusPublished - 2000
Externally publishedYes

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