期刊
EXPERT OPINION ON THERAPEUTIC TARGETS
卷 9, 期 4, 页码 831-849出版社
TAYLOR & FRANCIS LTD
DOI: 10.1517/14728222.9.4.831
关键词
1-methyl-tryptophan (1MT); antigen-presenting cell (APC); Bin 1; chemotherapy; dendritic cell (DC); Indo; indoleamine 2,3-dioxygenanse (IDO); macrophage; tryptophan; tumour
Indoleamine 2,3-dioxygenase (IDO) is an interferon (IFN)-gamma-inducible, extrahepatic enzyme that catalyses the initial and rate-limiting step in the degradation of the essential amino acid tryptophan. Elevated tryptophan catabolism mediated by IDO is associated with a wide variety of human cancers and has historically been thought to be a tumoricidal consequence of IFN-gamma exposure. Evidence of a physiological requirement for IDO activity in protecting the allogeneic fetus from rejection by the maternal immune system has stimulated a radical shift in thinking about the role of IDO in cancer. Evidence now suggests that tumours can exploit IDO-mediated peripheral tolerance to promote immune escape. This review summarises key studies that implicate IDO as an important mediator of peripheral immune tolerance as well as the development of a promising new anticancer modality that incorporates the use of IDO inhibitors. The second part focuses on the current state of development of IDO inhibitory compounds as potential pharmaceutical agents.
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