Rapid turnover of effector-memory CD4(+) T cells in healthy humans.

Rapid turnover of effector-memory CD4(+) T cells in healthy humans.
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DOI:
10.1084/jem.20040341
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发表时间:
2004-07-19
影响因子:
15.3
通讯作者:
Tough, DE
Tough, DE
中科院分区:
医学1区
文献类型:
--
作者:
Macallan, DC;Wallace, D;Zhang, Y;de Lara, C;Worth, AT;Ghattas, H;Griffin, GE;Beverley, PCL;Tough, DE

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记忆T细胞可分为中央记忆(TCM)细胞和效应记忆(TEM)细胞,它们的功能特性有所不同。尽管这两个亚群都可以长期存在,但尚不清楚它们是否通过类似的机制维持。我们使用氘代葡萄糖体内标记来测量健康人体内 CD4+ T 细胞的周转率。 CD45R0+CCR7− TEM 亚群的快速增殖率为每天 4.7%,而 CD45R0+CCR7+ TCM 细胞的增殖率为每天 1.5%;这些值分别相当于 15 天和 48 天的平均有丝分裂(倍增)时间。相比之下,CD45RA+CCR7+ 初始 CD4+ T 细胞群的寿命要长得多,每天的标记率仅为 0.2%(相当于大约 1 年的有丝分裂时间)。这些数据表明,人类 CD4+ TEM 细胞构成了一个短命的细胞群,需要在体内持续补充。
Memory T cells can be divided into central–memory (TCM) and effector–memory (TEM) cells, which differ in their functional properties. Although both subpopulations can persist long term, it is not known whether they are maintained by similar mechanisms. We used in vivo labeling with deuterated glucose to measure the turnover of CD4+ T cells in healthy humans. The CD45R0+CCR7− TEM subpopulation was shown to have a rapid proliferation rate of 4.7% per day compared with 1.5% per day for CD45R0+CCR7+ TCM cells; these values are equivalent to average intermitotic (doubling) times of 15 and 48 d, respectively. In contrast, the CD45RA+CCR7+ naive CD4+ T cell population was found to be much longer lived, being labeled at a rate of only 0.2% per day (corresponding to an intermitotic time of approximately 1 yr). These data indicate that human CD4+ TEM cells constitute a short-lived cell population that requires continuous replenishment in vivo.
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发表时间: 2001-10-01
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影响因子: --
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