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- W1519569270 abstract "B6.K(b-)D(b-) mice are devoid of class Ia but express normal levels of class Ib molecules. They have low levels of CD8 T cells in both the thymus as well as peripheral T cell compartments. Although the percentage of splenic CD8 alpha alpha T cells is increased in these animals, approximately 90% of CD8 T cells are CD8 alpha beta. In contrast to B6 animals, most of the CD8 T cells from these mice have a memory phenotype (CD44(high)CD122(high) CD62L(low)) including both CD8 alpha beta and CD8 alpha alpha subsets. In the thymus of B6.K(b-)D(b-) animals, there is a decrease in the percentage of SP CD8 T cells, although most are CD44(low), similar to that seen in B6 mice. The spleens from day 1-old B6 and B6.K(b-)D(b-) mice have a relatively high proportion of CD44(high)CD62L(low) CD8 T cells. However, by day 28 most CD8 T cells in B6 mice have a naive phenotype while in B6.K(b-)D(b-) mice the memory phenotype remains. Unlike CD44(high) cells that are found in B6 animals, most CD44(high) cells from B6.K(b-)D(b-) mice do not secrete IFN-gamma rapidly upon activation. The paucity of CD8 T cells in B6.K(b-)D(b-) mice might be due in part to their inability to undergo homeostatic expansion. Consistent with this, we found that CD8 T cells from these animals expand poorly in X-irradiated syngeneic hosts compared with B6 CD8 T cells that respond to class Ia Ags. We examined homeostatic expansion of B6 CD8 T cells in single as well as double class Ia knockout mice and were able to estimate the fraction of cells reactive against class Ia vs class Ib molecules." @default.
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- W1519569270 date "2003-06-01" @default.
- W1519569270 modified "2023-09-25" @default.
- W1519569270 title "Memory Phenotype of CD8+ T Cells in MHC Class Ia-Deficient Mice" @default.
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- W1519569270 doi "https://doi.org/10.4049/jimmunol.170.11.5414" @default.
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