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• W2152240724 endingPage "4581" @default.
• W2152240724 startingPage "4574" @default.
• W2152240724 abstract "Programmed death receptor 1 (PD-1) is expressed on thymocytes in addition to activated lymphocyte cells. Its ligation is thought to negatively regulate T cell activation, and PD-1(-/-) mice develop autoimmunity. To study the role of PD-1 on the development and function of a monoclonal CD8(+) T cell population, 2C TCR-transgenic/recombination-activating gene 2(-/-)/PD-1(-/-) mice were generated. Unexpectedly, approximately 30% of peripheral T cells in these mice were CD4/CD8 double negative (DN). Although the DN cells were not activated by Ag-expressing APCs, they functioned normally in response to anti-CD3/anti-CD28. These cells had a naive surface phenotype and lacked expression of NK1.1, B220, and gammadelta TCR; and the majority did not up-regulate CD8alphaalpha expression upon activation, arguing that they are not predominantly diverted gammadelta-lineage cells. The thymus was studied in detail to infer the mechanism of generation of DN peripheral T cells. Total thymus cellularity was reduced in 2C TCR-transgenic/recombination-activating gene 2(-/-)/PD-1(-/-) mice, and a relative increase in DN cells and decrease in double-positive (DP) cells were observed. Increased annexin V(+) cells among the DP population argued for augmented negative selection in PD-1(-/-) mice. In addition, an increased fraction of the DN thymocytes was HSA negative, suggesting that they had undergone positive selection. This possibility was supported by decreased emergence of DN PD-1(-/-) 2C cells in H-2(k) bone marrow chimera recipients. Our results are consistent with a model in which absence of PD-1 leads to greater negative selection of strongly interacting DP cells as well as increased emergence of DN alphabeta peripheral T cells." @default.
• W2152240724 created "2016-06-24" @default.
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• W2152240724 date "2003-11-01" @default.
• W2152240724 modified "2023-10-10" @default.
• W2152240724 title "Absence of Programmed Death Receptor 1 Alters Thymic Development and Enhances Generation of CD4/CD8 Double-Negative TCR-Transgenic T Cells" @default.
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• W2152240724 doi "https://doi.org/10.4049/jimmunol.171.9.4574" @default.
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• W2152240724 hasPublicationYear "2003" @default.
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