کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1934452 | 1050641 | 2008 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Aryl hydrocarbon receptor signaling mediates expression of indoleamine 2,3-dioxygenase Aryl hydrocarbon receptor signaling mediates expression of indoleamine 2,3-dioxygenase](/preview/png/1934452.png)
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 (Treg) 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 Treg 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 Treg that mediates the immune suppression through activation of AhR.
Journal: Biochemical and Biophysical Research Communications - Volume 375, Issue 3, 24 October 2008, Pages 331–335