期刊
BLOOD
卷 107, 期 9, 页码 3511-3519出版社
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2005-08-3454
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资金
- NIAID NIH HHS [R01 AI059621, T32 AI055428, R01AI047833, T32-AI-055428] Funding Source: Medline
Early T-lineage progenitors (ETPs) arise after colonization of the thymus by multipotent bone marrow progenitors. ETPs likely serve as physiologic progenitors of T-cell development in adult mice, although alternative T-cell differentiation pathways may exist. While we were investigating mechanisms of T-cell reconstitution after bone marrow transplantation (BMT), we found that efficient donor-derived thymopoiesis occurred before the pool of ETPs had been replenished. Simultaneously, T lineage-restricted progenitors were generated at extrathymic sites, both in the spleen and in peripheral lymph nodes, but not in the bone marrow or liver. The generation of these T lineage-committed cells occurred through a Notch-dependent differentiation process. Multipotent bone marrow progenitors efficiently gave rise to extrathymic T lineage-committed cells, whereas common lymphoid progenitors did not. Our data show plasticity of T-lineage commitment sites in the post-BMT environment and indicate that Notch-driven extrathymic T-lineage commitment from multipotent progenitors may contribute to early T-lineage reconstitution after BMT.
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