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- W2159328338 abstract "Indoleamine 2,3-dioxygenase (IDO) catalyzes the initial, rate-limiting step of tryptophan (Trp) catabolism along the kynurenine (KYN) pathway, and its induction in cells of the immune system in response to cytokines has been implicated in the regulation of antigen presentation and responses to cell-mediated immune attack. Microarray and quantitative PCR analyses of isolated human islets incubated with interferon (IFN)-γ for 24 h revealed increased expression of IDO mRNA (>139-fold) and Trp-tRNA synthase (WARS) (>17-fold) along with 975 other transcripts more than threefold, notably the downstream effectors janus kinase (JAK)2, signal transducer and activator of transcription (STAT)1, IFN-γ regulatory factor-1, and several chemokines (CXCL9/MIG, CXCL10/IP10, CXCL11/1-TAC, CCL2, and CCL5/RANTES) and their receptors. IDO protein expression was upregulated in IFN-γ–treated islets and accompanied by increased intracellular IDO enzyme activity and the release of KYN into the media. The response to IFN-γ was countered by interleukin-4 and 1α-methyl Trp. Immunohistochemical localization showed IDO to be induced in cells of both endocrine, including pancreatic duodenal homeobox 1–positive β-cells, and nonendocrine origin. We postulate that in the short term, IDO activation may protect islets from cytotoxic damage, although chronic exposure to various Trp metabolites could equally lead to β-cell attrition." @default.
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- W2159328338 date "2007-01-01" @default.
- W2159328338 modified "2023-10-11" @default.
- W2159328338 title "Induction of Indoleamine 2,3-Dioxygenase by Interferon-γ in Human Islets" @default.
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- W2159328338 doi "https://doi.org/10.2337/db06-0617" @default.
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