| First Author | Pociask DA | Year | 2011 |
| Journal | Am J Pathol | Volume | 178 |
| Issue | 3 | Pages | 1167-76 |
| PubMed ID | 21356368 | Mgi Jnum | J:169690 |
| Mgi Id | MGI:4941664 | Doi | 10.1016/j.ajpath.2010.11.055 |
| Citation | Pociask DA, et al. (2011) gammadelta T Cells Attenuate Bleomycin-Induced Fibrosis through the Production of CXCL10. Am J Pathol 178(3):1167-76 |
| abstractText | gammadelta T cells are a subset of T cells associated with epithelial mucosal tissues and play a prominent role in both promoting and dampening inflammatory responses to pathogens; in addition, they strongly mediate epithelial repair. By using a bleomycin model of pulmonary fibrosis, we found that gammadelta T-cell populations dramatically increased after bleomycin administration. To determine the importance of these cells, we exposed mice lacking the delta chain of the gammadelta T-cell receptor (gammadelta knockout [KO]) to bleomycin. Pulmonary fibrosis was more severe in gammadelta KO mice, as measured by collagen deposition (hydroxyproline) and histopathological features. Furthermore, there was no evidence of resolution of the fibrotic response up to 45 days after bleomycin therapy. In contrast to control mice, gammadelta KO mice had decreased concentrations of IL-6, granulocyte colony stimulating factor, chemokine CXC ligand (CXCL) 1, and interferon inducible protein 10/CXCL10. In vitro culture of gammadelta T cells purified from lungs 17 days after bleomycin exposure (a time of peak influx of these cells) demonstrated that gammadelta T cells produced substantial quantities of all four of these cytokines, suggesting that gammadelta T cells are a predominant source of these proteins. To demonstrate that gammadelta T cells are effector cells in the fibrotic response, we performed adoptive transfer experiments with gammadelta T cells sorted from bleomycin-treated lungs; these cells were sufficient to resolve fibrosis in gammadelta KO mice and restore CXCL10 levels comparable to wild-type mice. Furthermore, overexpression of CXCL10 in the lung decreased the severity of fibrosis seen in the gammadelta KO mice. Finally, adoptive transfer of gammadelta T cells from CXCL10(-/-) mice failed to reverse the severe fibrosis in gammadelta KO mice. These results indicate that gammadelta T cells promote the resolution of fibrosis through the production of CXCL10. |
