PMID- 24105077 OWN - NLM STAT- MEDLINE DCOM- 20141224 LR - 20220321 IS - 1438-2199 (Electronic) IS - 0939-4451 (Linking) VI - 45 IP - 6 DP - 2013 Dec TI - Indoleamine 2,3-dioxygenase 2 (IDO2) and the kynurenine pathway: characteristics and potential roles in health and disease. PG - 1319-29 LID - 10.1007/s00726-013-1602-1 [doi] AB - The kynurenine pathway is the major route for the oxidative degradation of the amino acid tryptophan. Activity of the pathway is involved in several disease conditions, both in the periphery and the central nervous system, including cancer, inflammatory disorders, neurological conditions, psychiatric disorders and neurodegenerative diseases. Three enzymes are now known to catalyze the first and rate-limiting step in the catabolism of tryptophan along this pathway: tryptophan 2,3-dioxygenase (TDO) and indoleamine 2,3-dioxygenase (IDO, subsequently named IDO1), both of which have been extensively studied, and a third enzyme, indoleamine 2,3-dioxygenase 2 (IDO2), a relative newcomer to the kynurenine pathway field. The adjuvant chemotherapeutic agent, 1-methyl-D-tryptophan, was intially suggested to target IDO2, implying involvement of IDO2 in tumorigenesis. Subsequently this compound has been suggested to have alternative actions and the physiological and pathophysiological roles of IDO2 are unclear. Targeted genetic interventions and selective inhibitors provide approaches for investigating the biology of IDO2. This review focuses on the current knowledge of IDO2 biology and discusses tools that will assist in further characterizing the enzymes of the kynurenine pathway. FAU - Fatokun, Amos A AU - Fatokun AA AD - School of Biomedical Sciences, Institute of Cell Signalling, The University of Nottingham, Nottingham, NG7 2UH, UK. FAU - Hunt, Nicholas H AU - Hunt NH FAU - Ball, Helen J AU - Ball HJ LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20131009 PL - Austria TA - Amino Acids JT - Amino acids JID - 9200312 RN - 0 (IDO2 protein, human) RN - 0 (IDO2 protein, mouse) RN - 0 (Indoleamine-Pyrrole 2,3,-Dioxygenase) RN - 343-65-7 (Kynurenine) SB - IM MH - Animals MH - Disease MH - Health MH - Humans MH - Indoleamine-Pyrrole 2,3,-Dioxygenase/*metabolism MH - Kynurenine/*metabolism EDAT- 2013/10/10 06:00 MHDA- 2014/12/30 06:00 CRDT- 2013/10/10 06:00 PHST- 2013/05/22 00:00 [received] PHST- 2013/09/25 00:00 [accepted] PHST- 2013/10/10 06:00 [entrez] PHST- 2013/10/10 06:00 [pubmed] PHST- 2014/12/30 06:00 [medline] AID - 10.1007/s00726-013-1602-1 [doi] PST - ppublish SO - Amino Acids. 2013 Dec;45(6):1319-29. doi: 10.1007/s00726-013-1602-1. Epub 2013 Oct 9.