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- W1675768449 abstract "Abstract Long-term persistence of Ag-experienced CD8 cells, a class of T lymphocytes with cytotoxic function, contributes to immunological memory against intracellular pathogens. After Ag clearance, memory CD8 cells are maintained over time by a slow proliferation, primarily cytokine driven. In this article, we show that the bone marrow (BM) is the crucial organ where such basal division of memory CD8 cells occurs. BM memory CD8 cells contain a higher percentage of proliferating cells than their corresponding cells in either spleen or lymph nodes from C57BL/6 mice. This occurs both in the case of memory-phenotype CD44high CD8 cells and in the case of Ag-specific memory CD8 cells. Importantly, the absolute number of Ag-specific memory CD8 cells dividing in the BM largely exceeds that in spleen, lymph nodes, liver, and lung taken together. In the BM, Ag-specific memory CD8 cells express lower levels of CD127, i.e., the α-chain of IL-7R, than in either spleen or lymph nodes. We interpret these results as indirect evidence that Ag-specific memory CD8 cells receive proliferative signals by IL-7 and/or IL-15 in the BM and propose that the BM acts as a saturable “niche” for the Ag-independent proliferation of memory CD8 cells. Taken together, our novel findings indicate that the BM plays a relevant role in the maintenance of cytotoxic T cell memory, in addition to its previously described involvement in long-term Ab responses." @default.
- W1675768449 created "2016-06-24" @default.
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- W1675768449 date "2005-06-15" @default.
- W1675768449 modified "2023-10-14" @default.
- W1675768449 title "CD8 Cell Division Maintaining Cytotoxic Memory Occurs Predominantly in the Bone Marrow" @default.
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- W1675768449 doi "https://doi.org/10.4049/jimmunol.174.12.7654" @default.
- W1675768449 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15944266" @default.
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