G-CSF对慢性粒细胞白血病患者bcr/abl+-CD34+细胞增殖、分化的影响

目的了解G-CSF对bcr／abl^＋-CD34^＋细胞增殖、分化的影响。方法采集慢性粒细胞白血病（CML）患者的bcr／abl^＋-CD34^＋细胞，分别以0、10、100、1000ng／ml的G-CSF与之共培养，并以正常骨髓CD34’细胞为对照，通过锥虫蓝拒染法、流式细胞术和光学显微镜观察研究其细胞增殖、周期分布、抗原分化和形态变化特点。结果所有实验组bcr／abl^＋-CD34^＋细胞均明显增长，其中G-CSF10ng／ml组培养48、96h，其细胞数显著高于同期无G-CSF组（P〈0．05）；而正常CD34^＋细胞数只在G-CSF存在的情况下增长明显，其中G-CSF100ng／ml组培养48、96、144h细胞数均显著高于同期无G-CSF组（P值分别为〈0．05，0．01，0．01）；G-CSF10、100、1000ng／ml组的bcr／abl^＋-CD34^＋细胞培养144h其Go／G1期比例显著低于G-CSF空白组（P〈0．05）；而正常CD34^＋细胞G-CSF10、100、1000ng／ml组培养48和96h其Go／G1期比例均明显低于无G-CSF组（P〈0．01）；bcr／abl^＋-CD34^＋细胞及正常CD34^＋细胞CD34抗原表达均随培养时间延长而下降，伴随CD33和CDl3抗原先升后降，其变化与G-CSF浓度无关。但bcr／abl^＋-CD34^＋细胞的各抗原分化显著快于正常CD34^＋细胞。bcr／abl^＋-CD34^＋细胞和正常CD34^＋细胞均随着增殖分化表现出终末细胞的形态特征。结论G-CSF能促进bcr／abl^＋-CD34^＋细胞及正常CD34^＋细胞的增殖，但并非前者增殖的必要条件。bcr／abl^＋-CD34^＋细胞比正常CD34^＋细胞分化更快，但两类细胞的分化速度均与G-CSF浓度无关。

Effect of G-CSF on the proliferation and differentiation of bcr/abl+ -CD34+ cells from CML patients

OBJECTIVE: To study the effect of granulocyte colony-stimulating factor (G-CSF) on the proliferation and differentiation of bcr/abl(+)-CD34+ cells. METHODS: bcr/abl(+)-CD34+ cells were isolated from bone marrow of chronic myelocytic leukemia (CML) patients and were treated with 0, 10, 100, 1000 ng/ml of G-CSF for 48, 96, 144 hs. CD34 cells from normal bone marrow were used as controls. Cell proliferation was determined by trypan blue dye exclusion, cell-cycle and antigen differentiation were determined by flow cytometry and cell morphology was observed under light microscope. RESULTS: The number of bcr/abl(+)-CD34+ cells was increased obviously in all groups. After cultured for 48 and 96 h, the number of bcr/abl(+)-CD34+ cells at G-CSF 10 ng/ml group was significantly higher than that in G-CSF 0 ng/ml group (P < 0.05) , the number of normal CD34 cells was increased only in the presence of G-CSF. After cultured for 48, 96 and 144 h, the cell number in G-CSF 100 ng/ml group was significantly higher than that in G-CSF 0 ng/ml group (P < 0.05, P < 0.01, P < 0.01, respectively). After cultured for 144 h, the cell percentages in G0/G1 phase for bcr/abl(+)-CD34+ cells in G-CSF 10, 100, 1000 ng/ml groups were significantly less than that in G-CSF 0 ng/ml group (P < 0. 05), and that for normal CD34 cells in G-CSF 10, 100, 1000 ng/ml groups were significantly less than that of G-CSF 0 ng/ml group after cultured for 48 and 96 h. The expressions of CD34 on bcr/abl(+)-CD34+ cells and normal CD34+ cells were decreased along with the culture duration, accompanied by the expression of CD33 and CD13 increased first and decreased later, which was not correlated with the concentration of G-CSF. Both bcr/abl(+)-CD34+ cells and normal CD34+ cells showed mature morphology along with proliferation and differentiation. CONCLUSIONS: G-CSF promotes proliferation of both bcr/abl(+)-CD34+ cells and normal CD34+ cells, but not necessary for the former, and the former differentiates more rapidly than the latter does, but both was independent of G-CSF.