| First Author | Rosenblum JM | Year | 2010 |
| Journal | J Immunol | Volume | 184 |
| Issue | 7 | Pages | 3450-60 |
| PubMed ID | 20194716 | Mgi Jnum | J:160084 |
| Mgi Id | MGI:4453401 | Doi | 10.4049/jimmunol.0903831 |
| Citation | Rosenblum JM, et al. (2010) CXC chemokine ligand (CXCL) 9 and CXCL10 are antagonistic costimulation molecules during the priming of alloreactive T cell effectors. J Immunol 184(7):3450-60 |
| abstractText | Donor Ag-reactive CD4 and CD8 T cell production of IFN-gamma is a principal effector mechanism promoting tissue injury during allograft rejection. The CXCR3-binding chemokines CXCL9 and CXCL10 recruit donor-reactive T cells to the allograft, but their role during the priming of donor-reactive T cells to effector function is unknown. Using a murine model of MHC-mismatched cardiac transplantation, we investigated the influence of CXCL9 and CXCL10 during donor-reactive T cell priming. In allograft recipient spleens, CXCL9 and CXCL10 were expressed as early as 24 h posttransplant and increased with similar kinetics, concurrently with CXCR3 expression on T cells. CXCL9, but not CXCL10, expression required NK cell production of IFN-gamma. The absence of CXCL9 in donor allografts, recipients, or both significantly decreased the frequency of donor-reactive CD8 T cells producing IFN-gamma and increased the frequency of donor-reactive CD8 T cells producing IL-17A. In contrast, the absence of CXCL10 increased the frequency of IFN-gamma-producing CD8 T cells in a CXCL9-dependent manner. These data provide novel evidence that donor-reactive CD8 T cells use the CXCR3 chemokine axis as a costimulation pathway during priming to allografts where CXCL9 promotes the development of IFN-gamma-producing CD8 T cells, and CXCL10 antagonizes this skewing. |
