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T-cell priming by dendritic cells in lymph nodes occurs in three distinct phases

机译:淋巴结中树突状细胞引发的T细胞启动分三个不同阶段

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摘要

Primary T-cell responses in lymph nodes (LNs) require contact-dependent information exchange between T cells and dendritic cells (DCs). Because lymphocytes continually enter and leave normal LNs, the resident lymphocyte pool is composed of non-synchronized cells with different dwell times that display heterogeneous behaviour in mouse LNs in vitro. Here we employ two-photon microscopy in vivo to study antigen-presenting DCs and naive T cells whose dwell time in LNs was synchronized. During the first 8 h after entering from the blood, T cells underwent multiple short encounters with DCs, progressively decreased their motility, and upregulated activation markers. During the subsequent 12 h T cells formed long-lasting stable conjugates with DCs and began to secrete interleukin-2 and interferon-γ. On the second day, coinciding with the onset of proliferation, T cells resumed their rapid migration and short DC contacts. Thus, T-cell priming by DCs occurs in three successive' stages: transient serial encounters during the first activation phase are followed by a second phase of stable contacts culminating in cytokine production, which makes a transition into a third phase of high motility and rapid proliferation.
机译:淋巴结(LN)中的主要T细胞反应需要T细胞与树突状细胞(DC)之间的接触依赖信息交换。由于淋巴细胞不断地进入和离开正常LN,因此驻留的淋巴细胞池由具有不同停留时间的非同步细胞组成,这些细胞在体外在小鼠LN中表现出异质性。在这里,我们在体内采用双光子显微镜研究抗原呈递的DC和幼稚T细胞,它们在LNs中的停留时间是同步的。在从血液进入后的最初8小时内,T细胞与DC进行了多次短暂接触,逐渐降低了它们的运动能力,并激活了激活标志物。在随后的12小时内,T细胞与DC形成了持久稳定的结合物,并开始分泌白介素2和干扰素-γ。在第二天,恰逢增殖开始,T细胞恢复了快速迁移和短暂的DC接触。因此,DC的T细胞启动发生在三个连续的阶段:在第一个激活阶段发生短暂的连续相遇,之后是稳定接触的第二阶段,最终达到细胞因子的产生,从而过渡到高运动和快速的第三阶段增殖。

著录项

  • 来源
    《Nature》 |2004年第6970期|p.154-159|共6页
  • 作者单位

    The CBR Institute for Biomedical Research, Department of Pathology, Harvard Medical School, 200 Longwood Avenue, Boston, Massachusetts 02115, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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