B7-H1基因在白血病细胞中的表达及其临床意义

本研究通过检测B7-H1基因在多种白血病细胞中的表达水平,探讨其临床意义。采用SYBR GreenⅠ实时定量PCR法检测9株白血病细胞系、4株IFN-γ体外诱导后的白血病细胞系,59例原代急性白血病细胞、10例原代白血病细胞诱导生成的树突状细胞(DC)以及2株实体肿瘤细胞系,10例正常人骨髓单个核细胞中B7-H1mRNA的表达水平,并对59例急性白血病患者的治疗反应与其白血病细胞中B7-H1基因表达水平之间的相关性进行了分析。结果显示:B7-H1 mRNA在白血病细胞系、原代急性白血病细胞中的表达水平较低,在IFN-γ体外诱导后的白血病细胞系、原代白血病细胞诱导生成的DC中的表达水平明显上调,在化疗后未获完全缓解(CR)的患者白血病细胞中B7-H1 mRNA表达水平明显高于化疗后获得CR的患者。结论:B7-H1基因在白血病细胞中的表达水平较低,但在某些因素作用下其表达水平明显上调。白血病细胞中B7-H1基因表达水平与患者的治疗反应有显著相关性。

Expression of B7-H1 gene in leukemia cells and its clinical significance

This study was purposed to investigate the expression of B7-H1 gene in leukemia cells and its clinical significance. The expression of B7-H1 mRNA was detected by SYBR Green I real-time quantitative PCR in a panel of 9 leukemia cell lines, 4 leukemia cell lines induced with IFN-γ, the bone marrow mononuclear cells (BMMNC) from 59 initial leukemia patients and 10 dendritic cells (DC) derived from BMMNC of initial leukemia patients, 2 solid tumour cell lines and BMMNC from 10 normal persons. The correlation between the clinical features of 59 acute leukemia patients and the expression level of B7-H1 mRNA in leukemia cells was analyzed. The results showed that the lower level of B7-H1 mRNA expression was found in leukemia cell lines and primary acute leukemia cells, but the expression level of B7-H1 mRNA was up-regulated significantly in the leukemia cell lines induced by IFN-γ and DC derived from BMMNC of leukemia patients. The expression level of B7-H1 mRNA in non complete remission (CR) patients after therapy was significantly higher than that in CR patients. It is concluded that the expression level of B7-H1 mRNA in leukemia cells is lower, but is up-regulated when affected by some factors. A correlation exists between the expression level of B7-H1 gene in leukemia cells and response of patients to therapy.