Estimating the precursor frequency of naive antigen-specific CD8 T cells.

Estimating the precursor frequency of naive antigen-specific CD8 T cells.
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DOI:
10.1084/jem.20001021
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发表时间:
2002-03-04
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Ahmed R
Ahmed R
中科院分区:
其他
文献类型:
--
作者:
Blattman JN;Antia R;Sourdive DJ;Wang X;Kaech SM;Murali-Krishna K;Altman JD;Ahmed R

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在淋巴细胞总数有限的情况下,要容纳多种抗原特异性的需求导致针对任何给定抗原的初始细胞频率(定义为前体频率)低于直接测量的检测极限。我们通过将已知数量的抗原特异性细胞滴定到初始受体中来估计这种前体频率。将初始的抗原特异性T细胞受体转基因细胞过继转移到同基因的非转基因受体中,然后用特异性抗原刺激,会导致供体和内源性抗原特异性细胞以剂量依赖的方式激活和扩增。当转基因和内源性反应程度相当时,前体频率等于转移的细胞数量。利用这种方法,我们估计针对淋巴细胞性脉络丛脑膜炎病毒(LCMV)的H - 2Db限制的GP33 - 41表位的初始CD8 T细胞的前体频率为2×10⁵分之一。因此,在一只含有约2 - 4×10⁷个初始CD8 T细胞的未感染小鼠中,我们估计有100 - 200个表位特异性细胞。在LCMV感染后,这100 - 200个GP33特异性初始CD8 T细胞在1周内分裂>14次,总数达到约10⁷个细胞。这些激活的GP33特异性效应CD8 T细胞中约有5%存活下来,形成一个约由5×10⁵个细胞组成的记忆细胞群。因此,急性LCMV感染导致DbGP33特异性CD8 T细胞的前体频率从感染前小鼠中的2×10²个初始细胞增加到免疫小鼠中的5×10⁵个记忆细胞,增加了>1000倍。
The constraint of fitting a diverse repertoire of antigen specificities in a limited total population of lymphocytes results in the frequency of naive cells specific for any given antigen (defined as the precursor frequency) being below the limit of detection by direct measurement. We have estimated this precursor frequency by titrating a known quantity of antigen-specific cells into naive recipients. Adoptive transfer of naive antigen-specific T cell receptor transgenic cells into syngeneic nontransgenic recipients, followed by stimulation with specific antigen, results in activation and expansion of both donor and endogenous antigen-specific cells in a dose-dependent manner. The precursor frequency is equal to the number of transferred cells when the transgenic and endogenous responses are of equal magnitude. Using this method we have estimated the precursor frequency of naive CD8 T cells specific for the H-2Db–restricted GP33–41 epitope of LCMV to be 1 in 2 × 105. Thus, in an uninfected mouse containing ∼2-4 × 107 naive CD8 T cells we estimate there to be 100–200 epitope-specific cells. After LCMV infection these 100–200 GP33-specific naive CD8 T cells divide >14 times in 1 wk to reach a total of ∼107 cells. Approximately 5% of these activated GP33-specific effector CD8 T cells survive to generate a memory pool consisting of ∼5 × 105 cells. Thus, an acute LCMV infection results in a >1,000-fold increase in precursor frequency of DbGP33-specific CD8 T cells from 2 × 102 naive cells in uninfected mice to 5 × 105 memory cells in immunized mice.
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