Migration and function of antigen-primed nonpolarized T lymphocytes in vivo.

Migration and function of antigen-primed nonpolarized T lymphocytes in vivo.
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DOI:
10.1084/jem.193.8.987
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发表时间:
2001-04-16
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Lanzavecchia A
Lanzavecchia A
中科院分区:
其他
文献类型:
--
作者:
Iezzi G;Scheidegger D;Lanzavecchia A

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受到抗原刺激后,幼稚 T 淋巴细胞会增殖,一部分活化细胞获得 1 型辅助 T 细胞 (Th1) 或 Th2 表型以及迁移至发炎组织的能力。然而,接受短 T 细胞受体 (TCR) 刺激的抗原引发的 T 细胞不会获得效应功能,并保持非极化状态。在过继转移系统中使用 TCR 转基因 CD4+ T 细胞,我们比较了幼稚、非极化 Th1 或 Th2 细胞的体内迁移能力。尽管所有细胞类型都迁移到脾脏,但只有初始和非极化 T 细胞有效迁移到淋巴结。此外,Th1(而非 Th2)迁移至发炎组织。在淋巴结中,非极化 T 细胞响应抗原刺激而增殖并获得效应功能,与初始 T 细胞相比,表现出更低的激活阈值和更快的动力学。这些结果表明,非极化 T 细胞处于分化的中间状态,其特征是淋巴结归巢能力和反应性增强,使它们能够发起迅速有效的二次反应。
Upon antigenic stimulation, naive T lymphocytes proliferate and a fraction of the activated cells acquire a T helper cell type 1 (Th1) or Th2 phenotype as well as the capacity to migrate to inflamed tissues. However, the antigen-primed T cells that receive a short T cell receptor (TCR) stimulation do not acquire effector function and remain in a nonpolarized state. Using TCR transgenic CD4+ T cells in an adoptive transfer system, we compared the in vivo migratory capacities of naive, nonpolarized, Th1 or Th2 cells. Although all cell types migrated to the spleen, only naive and nonpolarized T cells efficiently migrated to lymph nodes. In addition Th1, but not Th2, migrated to inflamed tissues. In the lymph nodes, nonpolarized T cells proliferated and acquired effector function in response to antigenic stimulation, displaying lower activation threshold and faster kinetics compared with naive T cells. These results suggest that nonpolarized T cells are in an intermediate state of differentiation characterized by lymph node homing capacity and increased responsiveness that allows them to mount a prompt and effective secondary response.
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