IDO in Human Gut Graft-versus-Host Disease

Philippe Ratajczak, Anne Janin, Régis Peffault de Larour, Lisa Koch, Brigitte Roche, David Munn, Bruce R. Blazar, Gérard Socié

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Although rodent graft-versus-host disease (GVHD) models have suggested that indoleamine 2,3-dioxygenase (IDO) is a critical regulator of gastrointestinal GVHD, parallel human studies on IDO expression have not been reported. IDO expression was assessed in 20 patients who underwent duodenal biopsy. IDO was upregulated in epithelial cells. In situ analyses reveal that macrophages and dendritic cells stain positive for IDO, but that most of the IDO + cells were a novel population of CD3 +CD4 +IDO + cells. The proportion of CD4 +IDO + T cells was significantly higher in patients with moderate GVHD. In situ regulatory T cell and Th17 numbers correlated with overall severity. Although needing confirmatory results from larger sample sets, these data are consistent with the hypothesis that IDO is involved in regulating gastrointestinal GVHD.

Original languageEnglish (US)
Pages (from-to)150-155
Number of pages6
JournalBiology of Blood and Marrow Transplantation
Issue number1
StatePublished - Jan 2012


  • Graft-vs-host disease
  • IDO
  • Regulatory T cells
  • Th17

ASJC Scopus subject areas

  • Hematology
  • Transplantation


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