rhG-CSF动员的外周血采集物与稳态骨髓中CD4^＋CD8^＋初始及记忆T细胞亚群的比较

本研究探讨重组人粒细胞集落刺激因子（rhG—CSF）动员的外周血采集物（G—PB）与稳态骨髓（SS—BM）中CD4^＋、CD8^＋初始、记忆T细胞亚群的差异。依据细胞表面CIM5RA和CD62L的表达将CD4^＋、CD8^＋T细胞划分为初始T细胞（naive，CIM5RA^＋CD62L^＋）、中心记忆T细胞（centralmemory，TCM，CIM5RA—CD62L^＋）、效应记忆T细胞（effeetor memory，TEM，CIM5RA^-CD62L^-）、终末分化效应记忆T细胞（terminally difierentiated effeetor memory，TTTp，CIM5RA^＋CD62L^-）。用流式细胞仪测定G—PB与SS—BM中CD4^＋、CD8^＋初始和记忆T细胞的比例组成，并计算每微升采集物中各细胞亚群的绝对数量。结果表明：G—PB中CD4^＋、CD8^＋T细胞的比例组成及CD4^＋／CD8^＋比值均高于SS—BM（P〈0．05）；G—PB中CD4^＋初始T细胞的比例显著低于SS—BM（P〈0．001），而CD4^＋TEM比例显著高于SS—BM（P〈0．001）；G—PB中CD8^＋初始和记忆T细胞亚群的比例与SS—BM无显著差异（P〉0．05）；与SS—BM相比，G—PB中CD4^＋CD62L^＋T细胞的比例明显降低（P=0．001），每微升G—PB移植物中的各淋巴细胞亚群均明显高于SS—BM（P〈0.001）。结论：G—PB与SS—BM中CD4^＋、CD8^＋初始和记忆T细胞亚群在相对和绝对数量方面存在明显的差异，这种差异可能影响G—PB和SS—BM移植后急性、慢性移植物抗宿主病发生率及其程度的异同。

Comparative Analysis of Naive and Memory CD4+ and CD8+ T-cell Subsets in rhG-CSF Mobilized Peripheral Blood and Steady-state Bone Marrow

The study was aimed to analyze the difference of naive and memory CD4(+) and CD8(+) T-cell subsets between steady-state bone marrow (SS-BM) and recombinant human granulocyte colony-stimulating factor (rhG-CSF) mobilized peripheral blood grafts (G-PB). Four CD4(+) and CD8(+) T-cell subsets classified according to the expression of CD45RA and CD62L were determined by three-color flow cytometry. The results showed that the percentage of CD4(+), CD8(+) T-cell subsets and the ratios of CD4/CD8 in G-PB were significantly higher than those in SS-BM (p < 0.05). The percentage of CD4(+) naive T-cells in G-PB was significantly lower than that in SS-BM (p < 0.001). As compared with SS-BM, the percentage of CD4(+) effector memory T-cells was significantly high in G-PB (p < 0.001). There were no significant differences in the percentages of the four CD8(+) T-cell subsets between SS-BM and G-PB (p > 0.05). The percentage of CD4(+)CD62L(+) T-cells in G-PB was significantly lower than that in SS-BM (p = 0.001). The absolute numbers of CD4(+) and CD8(+) T-cell subsets, the eight naive and memory CD4(+) and CD8(+) T-cell subsets were significantly higher in G-PB than those in SS-BM (p < 0.001). It is concluded that the difference of naive and memory CD4(+) and CD8(+) subsets between G-PB and SS-BM may partially explain why the incidence and severity of acute graft-versus-host disease (GVHD) was similar and the incidence of chronic GVHD was different after transplantation with SS-BM or G-PB.