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Treatment of Autoimmune Neuroinflammation with a Synthetic Tryptophan Metabolite
Michael Platten,1,3*Peggy P. Ho,1*Sawsan Youssef,1Paulo Fontoura,1,4Hideki Garren,1,5Eun Mi Hur,1Rohit Gupta,1Lowen Y. Lee,1Brian A. Kidd,1,6William H. Robinson,1,6Raymond A. Sobel,2Michael L. Selley,7Lawrence Steinman1
Local catabolism of the amino acid tryptophan (Trp) by indoleamine2,3-dioxygenase (IDO) is considered an important mechanism ofregulating T cell immunity. We show that IDO transcription wasincreased when myelin-specific T cells were stimulated withtolerogenic altered self-peptides. Catabolites of Trp suppressedproliferation of myelin-specific T cells and inhibited productionof proinflammatory T helper1 (TH1) cytokines. N-(3,4,-Dimethoxycinnamoyl)anthranilic acid (3,4-DAA), an orally active synthetic derivativeof the Trp metabolite anthranilic acid, reversed paralysis inmice with experimental autoimmune encephalomyelitis, a modelof multiple sclerosis (MS). Trp catabolites and their derivativesoffer a new strategy for treating TH1-mediated autoimmune diseasessuch as MS.
1 Department of Neurology and Neurological Sciences, Beckman Center for Molecular Medicine, Stanford University, Stanford, CA 94305, USA. 2 Department of Pathology (Neuropathology), Stanford University, Stanford, CA 94305, USA. 3 Department of General Neurology and Hertie-Institute for Clinical Brain Research, University of Tübingen, 72076 Tübingen, Germany. 4 Department of Immunology, Faculty of Medical Sciences, New University of Lisbon, 1169056 Lisbon, Portugal. 5 Bayhill Therapeutics Inc., Palo Alto, CA 94303, USA. 6 Geriatrics Research and Education Clinical Center (GRECC), Veterans Affairs Health System, Palo Alto, CA 94304, USA. 7 Angiogen Pharmaceuticals Pty. Ltd., Sydney, NSW 2000, Australia.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: steinman{at}stanford.edu (L.S.), michael.platten{at}uni-tuebingen.de (M.P.)
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