TY - JOUR
T1 - Immune response to Moloney-murine leukemia virus-induced antigens in bone marrow
AU - Biasi, Giovanni
AU - Facchinetti, Antonella
AU - Cappellari, Roberta
AU - Rossi, Elisabetta
AU - Zanovello, Paola
PY - 2011/7
Y1 - 2011/7
N2 - By exploring induction and persistence of virus-specific memory CD8+ T cells in the BM of Moloney-murine sarcoma/leukemia virus-immune mice, we observed that the amount of activated CD8+CD62L- cells increased more rapidly and persisted for a longer period than in peripheral organs. Among the CD8+CD62L- subset, the few cells, specific for M-MuLV encoded antigens, expressing TCRVβ5 rearrangements increased in an explosive manner doubling the percentage of TCRVβ5+ subset so that as a final result more than 10% of CD8+ lymphocytes became potential virus-specific cytotoxic effectors. The numerical expansion of Vβ5+ cells started and persisted in the same proportion among both CD8+CD62L- and CD8+CD62L+ subsets. In these subsets the analysis of CD44 phenotype, to distinguish effector (TEM) and central (TCM) memory, evidenced a twofold increase of Vβ5+ TEM percentage and fourfold increase of Vβ5+ TCM. In parallel, the non virus-specific Vβ5- counterpart, also numerically increased due to the CD8+ expansion, was partially reduced as TEM percentage and doubled as TCM percentage. We conclude that the immune response to M-MuLV encoded antigens in BM generate not only a large number of virus-specific memory cells but also the re-shaping of the entire memory T cell repertoire.
AB - By exploring induction and persistence of virus-specific memory CD8+ T cells in the BM of Moloney-murine sarcoma/leukemia virus-immune mice, we observed that the amount of activated CD8+CD62L- cells increased more rapidly and persisted for a longer period than in peripheral organs. Among the CD8+CD62L- subset, the few cells, specific for M-MuLV encoded antigens, expressing TCRVβ5 rearrangements increased in an explosive manner doubling the percentage of TCRVβ5+ subset so that as a final result more than 10% of CD8+ lymphocytes became potential virus-specific cytotoxic effectors. The numerical expansion of Vβ5+ cells started and persisted in the same proportion among both CD8+CD62L- and CD8+CD62L+ subsets. In these subsets the analysis of CD44 phenotype, to distinguish effector (TEM) and central (TCM) memory, evidenced a twofold increase of Vβ5+ TEM percentage and fourfold increase of Vβ5+ TCM. In parallel, the non virus-specific Vβ5- counterpart, also numerically increased due to the CD8+ expansion, was partially reduced as TEM percentage and doubled as TCM percentage. We conclude that the immune response to M-MuLV encoded antigens in BM generate not only a large number of virus-specific memory cells but also the re-shaping of the entire memory T cell repertoire.
KW - Bone marrow
KW - CD8 T cells
KW - T cell activation
KW - T cell memory
KW - T cell repertoire
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U2 - 10.1016/j.imlet.2011.03.005
DO - 10.1016/j.imlet.2011.03.005
M3 - Article
C2 - 21453727
AN - SCOPUS:79957772508
VL - 138
SP - 79
EP - 85
JO - Immunology Letters
JF - Immunology Letters
SN - 0165-2478
IS - 1
ER -