Cited by 313Tryptophan and brain disordersNeuroinflammation and Neurodegeneration MechanismsAmino Acid Enzymes and Metabolism

The kynurenine pathway and neurodegenerative disease

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Maddison, Daniel C., Giorgini, Flaviano·2015·Seminars in Cell & Developmental Biology

Abstract

Neuroactive metabolites of the kynurenine pathway (KP) of tryptophan degradation have been closely linked to the pathogenesis of several neurodegenerative diseases. Tryptophan is an essential amino acid required for protein synthesis, and in higher eukaryotes is also converted into the key neurotransmitters serotonin and tryptamine. However, in mammals >95% of tryptophan is metabolized through the KP, ultimately leading to the production of nicotinamide adenosine dinucleotide (NAD(+)). A number of the pathway metabolites are neuroactive; e.g. can modulate activity of several glutamate receptors and generate/scavenge free radicals. Imbalances in absolute and relative levels of KP metabolites have been strongly associated with neurodegenerative disorders including Huntington's, Alzheimer's, and Parkinson's diseases. The KP has also been implicated in the pathogenesis of other brain disorders (e.g. schizophrenia, bipolar disorder), as well as several cancers and autoimmune disorders such as HIV. Pharmacological and genetic manipulation of the KP has been shown to ameliorate neurodegenerative phenotypes in a number of model organisms, suggesting that it could prove to be a viable target for the treatment of such diseases. Here, we provide an overview of the KP, its role in neurodegeneration and the current strategies for therapeutic targeting of the pathway.

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Crossref · 10.1016/j.semcdb.2015.03.002

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  • Because TLR3 is abundantly expressed in the brain, abnormal activation of NMDA receptor signalling by quinolinic acid might be at least partially responsible for numerous neurological diseases.

    “As TLR3 is abundantly expressed in the brain187, abnormal activation of NMDA receptor signalling by quinolinic acid might be at least partially responsible for numerous neurological diseases186,188.”

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Authors
Maddison, D. C., & Giorgini, F.
Affiliations
University of Leicester (GB)
Corresponding author
Giorgini, Flaviano
Venue
Seminars in Cell & Developmental Biology
Publisher
Elsevier BV
Published
2015-04
Volume
40
Pages
134-141
ISSN
1084-9521 (ISSN-L)
OpenAlex
W1990201789
Cited by
309
References
94
Citations by year
2026: 17 · 2025: 31 · 2024: 29 · 2023: 30 · 2022: 32 · 2021: 47 · 2020: 33 · 2019: 27 · 2018: 19 · 2017: 21 · 2016: 17 · 2015: 6
FWCI
1.20
Type
journal article
Language
en
Open access
Locations
  • Seminars in Cell and Developmental Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Figshare (submittedVersion, cc-by)
  • ORCA Online Research @Cardiff (Cardiff University) (submittedVersion)
  • Leicester Research Archive (University of Leicester) (submittedVersion, other-oa)
Funders
  • the Midlands Integrative Biosciences Training Partnership (MIBTP)
  • the Biotechnology and Biological Sciences Research Council (BBSRC)
  • the Medical Research Council (MRC)
  • the CHDI Foundation
Topics
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
Keywords
kynurenine pathway, tryptophan metabolism, neurodegenerative diseases, NAD biosynthesis, kynurenine metabolites, glutamate receptors, free radicals, Huntington's disease, Alzheimer's disease, Parkinson's disease, schizophrenia, bipolar disorder, HIV, therapeutic targeting, neuroactive metabolites
MeSH terms
Animals, Humans, Kynurenine, Tryptophan, Neurodegenerative Diseases, Metabolic Networks and Pathways

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