| First Author | Koyama M | Year | 2009 |
| Journal | Blood | Volume | 113 |
| Issue | 9 | Pages | 2088-95 |
| PubMed ID | 19144988 | Mgi Jnum | J:146164 |
| Mgi Id | MGI:3836849 | Doi | 10.1182/blood-2008-07-168609 |
| Citation | Koyama M, et al. (2009) Plasmacytoid dendritic cells prime alloreactive T cells to mediate graft-versus-host disease as antigen-presenting cells. Blood 113(9):2088-95 |
| abstractText | Dendritic cells (DCs) can be classified into 2 distinct subsets: conventional DCs (cDCs) and plasmacytoid DCs (pDCs). cDCs can prime antigen-specific T-cell immunity, whereas in vivo function of pDCs as antigen-presenting cells remains controversial. We evaluated the contribution of pDCs to allogeneic T-cell responses in vivo in mouse models of graft-versus-host disease (GVHD) after allogeneic hematopoietic stem cell transplantation by an add-back study of MHC-expressing pDCs into major histocompatibility complex-deficient mice that were resistant to GVHD. Alloantigen expression on pDCs alone was sufficient to prime alloreactive T cells and cause GVHD. An inflammatory environment created by host irradiation has the decisive role in maturing pDCs for T-cell priming but this process does not require Toll-like receptor signaling. Thus, functional outcomes of pDC-T-cell interactions depend on the immunologic context of encounter. To our knowledge, these results are the first to directly demonstrate an in vivo pathogenic role of pDCs as antigen-presenting cells in an antigen-specific T cell-mediated disease in the absence of other DC subsets and to provide important insight into developing strategies for tolerance induction in transplantation. |
