| First Author | Legrand N | Year | 2001 |
| Journal | J Immunol | Volume | 167 |
| Issue | 11 | Pages | 6158-64 |
| PubMed ID | 11714775 | Mgi Jnum | J:72795 |
| Mgi Id | MGI:2153613 | Doi | 10.4049/jimmunol.167.11.6158 |
| Citation | Legrand N, et al. (2001) CD8(+) T Lymphocytes in Double alphabeta TCR Transgenic Mice. II. Competitive Fitness of Dual alphabeta TCR CD8(+) T Lymphocytes in the Peripheral Pools. J Immunol 167(11):6158-64 |
| abstractText | We studied Rag2-deficient mice bearing two rearranged alphabeta TCR transgenes, both restricted to the MHC H-2D(b) class I molecule. We have previously shown that, in these DTg mice, most peripheral CD8 T cells express one TCRbeta chain associated with two TCRalpha chains, as in one-third of the mature T cells from normal mice. We examined the functional behavior of the dual-receptor CD8 T cells developing either in the absence or in the presence of self-Ag. The dual-receptor CD8 T cells, which develop in absence of self-Ag, show efficient responses to immunization and remain sensitive to induction of peripheral tolerance. In contrast to single TCR T cells, the dual-TCR cells, when tolerized upon exposure to high levels of self-Ag, are not deleted and therefore may exert important regulatory functions. When developing in the presence of self-Ag, the dual-receptor-expressing CD8 T cells escape central deletion, but are not fully competent to respond to cognate stimuli. Overall, we found that the dual-TCR CD8 T cells show a poor competitive value and can be out-competed by single-TCR cells, both in the course of immune responses and in reconstitution experiments. The decreased fitness of the dual-receptor cells may contribute to diminishing the autoimmune hazard that they could represent. |
