Memory T Cells Are Enriched in Lymph Nodes of Selectin-Ligand–Deficient Mice
pmid: 20937846
Memory T Cells Are Enriched in Lymph Nodes of Selectin-Ligand–Deficient Mice
Abstract Fucosyltransferase-IV and -VII double knockout (FtDKO) mice reveal profound impairment in T cell trafficking to lymph nodes (LNs) due to an inability to synthesize selectin ligands. We observed an increase in the proportion of memory/effector (CD44high) T cells in LNs of FtDKO mice. We infected FtDKO mice with lymphocytic choriomeningitis virus to generate and track Ag-specific CD44highCD8 T cells in secondary lymphoid organs. Although frequencies were similar, total Ag-specific effector CD44highCD8 T cells were significantly reduced in LNs, but not blood, of FtDKO mice at day 8. In contrast, frequencies of Ag-specific memory CD44highCD8 T cells were up to 8-fold higher in LNs of FtDKO mice at day 60. Because wild-type mice treated with anti-CD62L treatment also showed increased frequencies of CD44high T cells in LNs, we hypothesized that memory T cells were preferentially retained in, or preferentially migrated to, FtDKO LNs. We analyzed T cell entry and egress in LNs using adoptive transfer of bone fide naive or memory T cells. Memory T cells were not retained longer in LNs compared with naive T cells; however, T cell exit slowed significantly as T cell numbers declined. Memory T cells were profoundly impaired in entering LNs of FtDKO mice; however, memory T cells exhibited greater homeostatic proliferation in FtDKO mice. These results suggest that memory T cells are enriched in LNs with T cell deficits by several mechanisms, including longer T cell retention and increased homeostatic proliferation.
- National Institute for Mathematical and Biological Synthesis United States
- University of Tennessee at Knoxville United States
Mice, Knockout, Cell Separation, CD8-Positive T-Lymphocytes, Flow Cytometry, Fucosyltransferases, Ligands, Mice, Inbred C57BL, Chemotaxis, Leukocyte, Mice, Hyaluronan Receptors, T-Lymphocyte Subsets, Selectins, Animals, Lymph Nodes, Immunologic Memory, Cell Proliferation
Mice, Knockout, Cell Separation, CD8-Positive T-Lymphocytes, Flow Cytometry, Fucosyltransferases, Ligands, Mice, Inbred C57BL, Chemotaxis, Leukocyte, Mice, Hyaluronan Receptors, T-Lymphocyte Subsets, Selectins, Animals, Lymph Nodes, Immunologic Memory, Cell Proliferation
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