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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Toward the identification of a tolerogenic signature in IDO-competent dendritic cells.

Although much is known about the transcriptional profiles of dendritic cells (DCs) during maturation, the molecular switches critical for the induction of a tolerogenic program in DC subsets are still obscure. We examined the gene-expression profiles of murine splenic CD8+ DCs rendered highly tolerogenic by interferon-gamma ( IFN-gamma), which activates the enzyme indoleamine 2,3-dioxygenase (IDO, encoded by Indo) and thus initiates the immunosuppressive pathway of tryptophan catabolism. By examining the expression of a series of relevant genes in IDO+ compared with IDO- DCs, we found consistent and selective association of the IDO-competent phenotype with down-modulation of the Tyrobp gene, encoding the signaling adapter DAP12, which typically associates with activating receptors. Down-modulation of Tyrobp involved IFN consensus sequence binding protein (ICSBP), a transcription factor also known as IRF-8. In murine and human monocyte-derived DCs, silencing DAP12 expression imparted IDO functional competence to IDO- cells, whereas silencing IRF-8 in IDO+ counterparts abolished IDO expression and function. Thus, IRF-8 is required in tolerogenic DCs for the positive regulation of Indo and the negative regulation of Tyrobp. Overall, these studies reveal the occurrence of a simple and evolutionarily conserved code in the control of tolerance by an ancestral metabolic enzyme.[1]


  1. Toward the identification of a tolerogenic signature in IDO-competent dendritic cells. Orabona, C., Puccetti, P., Vacca, C., Bicciato, S., Luchini, A., Fallarino, F., Bianchi, R., Velardi, E., Perruccio, K., Velardi, A., Bronte, V., Fioretti, M.C., Grohmann, U. Blood (2006) [Pubmed]
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