Abstract
Tryptophan (TRP) is an essential amino acid that plays a critical role in synthesis of a host of modulatory biomolecules including serotonin, melatonin, tryptamine, and kynurenine (KYN). TRP can either be incorporated into proteins, converted to the neurotransmitter serotonin (5-hydroxytryptamine), or metabolized to kynurenine. The majority of dietary TRP is metabolized via the kynurenine pathway (KP). The initial and rate-limiting step in the KP involves one of three enzymes, namely, the two isoforms of indoleamine 2-3-dioxygenase (IDO1 and IDO2) and tryptophan 2,3-dioxygenase (TDO). In this chapter, we provide a broad overview of the KP and explore the gene regulation of the key enzymes involved.
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Abbreviations
- 3-HK:
-
3-Hydroxykynurenine
- AhR:
-
Aryl hydrocarbon receptor
- GR:
-
Glucocorticoid receptor
- IDO:
-
Indoleamine 2,3-dioxygenase
- KAT:
-
Kynurenine aminotransferase
- KYNA:
-
Kynurenic acid
- KYN:
-
Kynurenine
- KMO:
-
Kynurenine 3-monooxygenase
- KP:
-
Kynurenine pathway
- QUIN:
-
Quinolinic acid
- TRP:
-
Tryptophan
- TDO:
-
Tryptophan 2,3-dioxygenase
- STAT:
-
Signal transducer and activator of transcription
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Acknowledgments
This work was supported by a grant (R01 CA123451 to SM) from the National Cancer Institute; a grant from the Fund for Medical Research and Education, Wayne State University School of Medicine (to SM); and Strategic Research Initiative Grants from the Karmanos Cancer Institute (to SM).
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Michelhaugh, S.K., Guastella, A.R., Mittal, S. (2015). Overview of the Kynurenine Pathway of Tryptophan Metabolism. In: Mittal, S. (eds) Targeting the Broadly Pathogenic Kynurenine Pathway. Springer, Cham. https://doi.org/10.1007/978-3-319-11870-3_1
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DOI: https://doi.org/10.1007/978-3-319-11870-3_1
Publisher Name: Springer, Cham
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