| First Author | Su J | Year | 2005 |
| Journal | J Immunol | Volume | 175 |
| Issue | 10 | Pages | 6450-7 |
| PubMed ID | 16272298 | Mgi Jnum | J:119398 |
| Mgi Id | MGI:3701939 | Doi | 10.4049/jimmunol.175.10.6450 |
| Citation | Su J, et al. (2005) Thymus-dependent memory phenotype CD8 T cells in naive B6.H-2Kb-/-Db-/- animals mediate an antigen-specific response against Listeria monocytogenes. J Immunol 175(10):6450-7 |
| abstractText | B6.H-2Kb-/-Db-/- (DKO) mice have greatly reduced numbers of mature CD8alphabeta T cells in their periphery. However, these non-class Ia-selected CD8alphabeta T cells are able to mediate immune responses to a number of pathogens. Approximately 60% of the CD8alphabeta T cells in the spleen and peripheral lymph nodes of naive DKO mice display a memory (CD44high) phenotype. To investigate the origins of these non-class Ia-selected CD8alphabetaCD44high cells, we traced the phenotype of recent thymic emigrants and found that most were CD44low. We also determined whether their appearance was thymus dependent and found that only a small percentage of non-class Ia-selected CD8alphabetaCD44high cells develop in a thymus-independent pathway. Functionally, CD8alphabetaCD44high cells from DKO mice are able to secrete IFN-gamma in response to IL-12 and IL-18 in the absence of cognate Ag. When challenged with anti-CD3 in vivo, nearly half of these cells produce IFN-gamma within 3 h. When purified CD8alphabetaCD44high cells from Thy1.2.DKO mice were transferred into Thy1.1 DKO recipients and then challenged with Listeria monocytogenes, an Ag-specific anti-L. monocytogenes response was observed 6 days later. Our data suggest that non-class Ia-selected CD8alphabetaCD44high cells in naive animals can respond rapidly to Ag and play a role in the innate as well as the early phase of the acquired immune response. |
