L-Tryptophan-kynurenine pathway enzymes are therapeutic target for neuropsychiatric diseases: Focus on cell type differences

Neuropharmacology
Hidetsugu FujigakiKuniaki Saito

Abstract

The kynurenine pathway (KP) is the major route for tryptophan (TRP) metabolism in most mammalian tissues. The KP metabolizes TRP into a number of neuroactive metabolites, such as kynurenine (KYN), kynurenic acid (KYNA), 3-hydroxykynurenine (3-HK), and quinolinic acid (QUIN). Elevated metabolite concentrations in the central nervous system are associated with the pathophysiology of several inflammation-related neuropsychiatric diseases. During an inflammatory response, the initial KP metabolic step is primarily regulated by indoleamine 2,3-dioxygenase 1 (IDO1), which produces KYN from TRP. Following this initial step, the KP has 2 distinct branches; one branch is regulated by kynurenine 3-monooxygenase (KMO) and is primarily responsible for the 3-HK and QUIN production, and the other branch is regulated by kynurenine aminotransferase (KAT), which produces KYNA, an N-methyl-d-aspartate receptor and alpha-7-nicotinic acetylcholine receptor antagonist. Unbalanced KP metabolism has been demonstrated in distinct neuropsychiatric diseases; thus, understanding the mechanisms that regulate KP enzyme expression and activity is important. These enzymes are expressed by specific cell types, and the induction of enzyme expression by inflamm...Continue Reading

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