CCL23/骨髓抑制因子1(MPIF-1)对于U937细胞的增殖、凋亡和分化的影响

CCL23/MPIF-1是人类趋化因子CC家族的一员,在血细胞中仅在单核细胞源的树突状细胞中持续表达,在体内和体外实验中对人、鼠的髓系祖细胞的增殖和分化均有明显的抑制作用。最近的研究发现,CCL23在儿童急性髓系白血病骨髓和外周血样本均有高表达。为了了解CCL23的高表达在白血病进展、治疗和预后中的意义,选用白血病细胞系U937细胞作为研究对象,加入人类重组CCL23培养72小时,用CCK-8试剂盒测细胞增殖,FITC-AnnexinV/PI法检测细胞凋亡率,并观察不同处理条件下细胞分化情况及CCL23受体CCR1的表达水平。结果发现：单独的CCL23对于U937细胞的增殖、凋亡和分化无明显作用（P〉0.05）;但在U937受PMA诱导分化的过程中,CCL23有明显的促分化作用,同时发现此过程中CCR1表达显著升高（P〈0.05）。结论：CCL23对U937细胞无明显抑制作用,但可能与PMA产生协同诱导分化作用,而且该作用的出现可能与CCL23受体CCR1表达升高有关。

Effect of CCL23/Myeloid Progenitor Inhibitory Factor 1(MPIF-1) on the Proliferation,Apoptosis and Differentiation of U937 Cells

CCL23 is a human CC chemokine with potential suppression effects on both human and murine myeloid progenitor cells both in vitro and in vivo,and only expressed and released by dendritic cells differentiated from monocytes in blood cells.However,recent study has shown that CCL23 was over-expressed in bone marrow and peripheral blood cells from pediatric patients with acute myeloid leukemia(AML).In order to investigate the effects of CCL23 on the development,therapy and prognosis of leukemia,the U937 cells,a leukemic cell strain,were adopted and cultured with rhCCL23 for 72 hours.The cell proliferation and apoptosis rate were detected by Cell Counting Kit-8 and FITC-AnnexinV/PI respectively;the morphologic changes and the expression of CCR1(the only receptor of CCL23 known by now)were observed during the differentiation process.The results showed that no obvious effect on the proliferation,apoptosis and differentiation of U937 was found by using CCL23 alone(P>0.05),but cultured in combination with CCL23 and PMA,the differentiation of U937 cells were promoted remarkably,during which the CCR1 expression increased(P<0.05).It is concluded that CCL23 alone did not inhibit the proliferation and differentiation of U937,while its use in combination with PMA may possess synergistic effect on inducting differentiation of U937 through the increase of receptor CCR1 expression.