| First Author | Anderson CF | Year | 2007 |
| Journal | J Exp Med | Volume | 204 |
| Issue | 2 | Pages | 285-97 |
| PubMed ID | 17283207 | Mgi Jnum | J:125372 |
| Mgi Id | MGI:3758385 | Doi | 10.1084/jem.20061886 |
| Citation | Anderson CF, et al. (2007) CD4(+)CD25(-)Foxp3(-) Th1 cells are the source of IL-10-mediated immune suppression in chronic cutaneous leishmaniasis. J Exp Med 204(2):285-97 |
| abstractText | Nonhealing forms of leishmaniasis in humans are commonly associated with elevated levels of the deactivating cytokine IL-10, and in the mouse, normally chronic infections can be cleared in the absence of IL-10. Using a Leishmania major strain that produces nonhealing dermal lesions in a T helper type 1 (Th1) cell-polarized setting, we have analyzed the cellular sources of IL-10 and their relative contribution to immune suppression. IL-10 was produced by innate cells, as well as CD4(+)CD25(+)Foxp3(+) and CD4(+)CD25(-)Foxp3(-) T cells in the chronic lesion. Nonetheless, only IL-10 production by antigen-specific CD4(+)CD25(-)Foxp3(-) T cells, the majority of which also produced IFN-gamma, was necessary for suppression of acquired immunity in Rag(-/-) reconstituted mice. Surprisingly, Rag(-/-) mice reconstituted with naive CD4(+) T cells depleted of natural T regulatory cells developed more severe infections, associated with elevated levels of IL-10 and, especially, Th2 cytokines in the site. The data demonstrate that IL-10-producing Th1 cells, activated early in a strong inflammatory setting as a mechanism of feedback control, are the principal mediators of T cell-derived IL-10-dependent immune suppression in a chronic intracellular infection. |
