| First Author | Ataera H | Year | 2013 |
| Journal | J Leukoc Biol | Volume | 94 |
| Issue | 4 | Pages | 825-33 |
| PubMed ID | 23883515 | Mgi Jnum | J:205311 |
| Mgi Id | MGI:5544548 | Doi | 10.1189/jlb.0413200 |
| Citation | Ataera H, et al. (2013) The control of CD8+ T cell responses is preserved in perforin-deficient mice and released by depletion of CD4+CD25+ regulatory T cells. J Leukoc Biol 94(4):825-33 |
| abstractText | Immune suppression by Treg has been demonstrated in a number of models, but the mechanisms of this suppression are only partly understood. Recent work has suggested that Tregs may suppress by directly killing immune cell populations in vivo in a perforin- and granzyme B-dependent manner. To establish whether perforin is necessary for the regulation of immune responses in vivo, we examined OVA-specific CD8(+) T cell responses in WT and PKO mice immunized with OVA and alpha-GalCer and the expansion of WT OT-I CD8(+) T cells adoptively transferred into WT or PKO mice immunized with DC-OVA. We observed similar expansion, phenotype, and effector function of CD8(+) T cells in WT and PKO mice, suggesting that CD8(+) T cells were subjected to a similar amount of regulation in the two mouse strains. In addition, when WT and PKO mice were depleted of Tregs by anti-CD25 mAb treatment before DC-OVA immunization, CD8(+) T cell proliferation, cytotoxicity, and cytokine production were increased similarly, suggesting a comparable involvement of CD25(+) Tregs in controlling T cell proliferation and effector function in these two mouse strains. These data suggest that perforin expression is not required for normal immune regulation in these models of in vivo CD8(+) T cell responses induced by immunization with OVA and alpha-GalCer or DC-OVA. |
