PMID- 18694728 OWN - NLM STAT- MEDLINE DCOM- 20080929 LR - 20211020 IS - 1090-2104 (Electronic) IS - 0006-291X (Print) IS - 0006-291X (Linking) VI - 375 IP - 3 DP - 2008 Oct 24 TI - Aryl hydrocarbon receptor signaling mediates expression of indoleamine 2,3-dioxygenase. PG - 331-5 LID - 10.1016/j.bbrc.2008.07.156 [doi] AB - Aryl hydrocarbon receptor (AhR) activation by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) leads to immune suppression associated with the induction of regulatory T cells (T(reg)) expressing the transcription factor Foxp3. The immunological mechanisms of suppression are not well understood however dendritic cells (DC) are considered a key target for AhR-mediated immune suppression. Here we show that activation of AhR by TCDD induces DC indoleamine 2,3-dioxygenase 1 (IDO1) and indoleamine 2,3-dioxygenase-like protein (IDO2). Induction of IDO1 and IDO2 was also found in lung and spleen associated with an increase of the T(reg) marker Foxp3 in spleen of TCDD-treated C57BL/6 mice, which is suppressed by inhibition of IDO. These data indicate that AhR-activation is an important signaling pathway for IDO expression and suggest a critical role of IDO in the mechanism leading to the generation of T(reg) that mediates the immune suppression through activation of AhR. FAU - Vogel, Christoph F A AU - Vogel CF AD - Department of Environmental Toxicology, University of California, One Shields Avenue, Davis, CA 95616, USA. FAU - Goth, Samuel R AU - Goth SR FAU - Dong, Bin AU - Dong B FAU - Pessah, Isaac N AU - Pessah IN FAU - Matsumura, Fumio AU - Matsumura F LA - eng GR - R01 ES005233-14/ES/NIEHS NIH HHS/United States GR - R01 ES005233/ES/NIEHS NIH HHS/United States GR - R21 ES015846-01A2/ES/NIEHS NIH HHS/United States GR - R21 ES015846/ES/NIEHS NIH HHS/United States GR - R01 ES019898/ES/NIEHS NIH HHS/United States GR - R21 ES015846-02/ES/NIEHS NIH HHS/United States GR - P01 ES011269/ES/NIEHS NIH HHS/United States GR - R01-ES05233/ES/NIEHS NIH HHS/United States GR - P01 ES011269-08/ES/NIEHS NIH HHS/United States PT - Journal Article PT - Research Support, N.I.H., Extramural PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, Non-P.H.S. DEP - 20080809 PL - United States TA - Biochem Biophys Res Commun JT - Biochemical and biophysical research communications JID - 0372516 RN - 0 (Indoleamine-Pyrrole 2,3,-Dioxygenase) RN - 0 (Polychlorinated Dibenzodioxins) RN - 0 (Receptors, Aryl Hydrocarbon) RN - 82115-62-6 (Interferon-gamma) SB - IM MH - Animals MH - *Immune Tolerance MH - Indoleamine-Pyrrole 2,3,-Dioxygenase/*metabolism MH - Interferon-gamma/pharmacology MH - Mice MH - Mice, Inbred C57BL MH - Polychlorinated Dibenzodioxins/pharmacology MH - Receptors, Aryl Hydrocarbon/agonists/*metabolism MH - Signal Transduction MH - T-Lymphocytes, Regulatory/drug effects/enzymology/*immunology PMC - PMC2583959 MID - NIHMS70652 EDAT- 2008/08/13 09:00 MHDA- 2008/09/30 09:00 PMCR- 2009/10/24 CRDT- 2008/08/13 09:00 PHST- 2008/06/28 00:00 [received] PHST- 2008/07/30 00:00 [accepted] PHST- 2008/08/13 09:00 [pubmed] PHST- 2008/09/30 09:00 [medline] PHST- 2008/08/13 09:00 [entrez] PHST- 2009/10/24 00:00 [pmc-release] AID - S0006-291X(08)01495-2 [pii] AID - 10.1016/j.bbrc.2008.07.156 [doi] PST - ppublish SO - Biochem Biophys Res Commun. 2008 Oct 24;375(3):331-5. doi: 10.1016/j.bbrc.2008.07.156. Epub 2008 Aug 9.