人端粒重复序列结合因子在急性白血病细胞中的表达及与端粒酶活性的关系

目的:研究人端粒重复序列结合因子(TRF1)在30例急性白血病细胞中的表达,了解TRF1表达与急性白血病分型的关系,以及与端粒酶活性的关系.方法:用荧光定量RT-PCR定量检测30例急性白血病细胞中TRF1 mRNA表达情况,同时检测hTERT mRNA的表达,并分析两者之间的相关性.结果:TRF1在急性非淋巴细胞性白血病(ANLL)细胞中的表达0.0126(0.0127～0.0546)明显低于正常人骨髓单个核细胞中的表达0.0457(0.00839～0.262)(P<0.001),但在急性淋巴细胞性白血病(ALL)细胞中的表达0.0745(1.92×10-6～0.193)与正常人骨髓单个核细胞比较差异无显著性,且在ANLL细胞中的表达明显低于ALL细胞中的表达(P=0.001).TRF1和hTERT在急性白血病细胞和正常人骨髓单个核细胞中的表达无显著相关性(r=-0.173,P=0.207).结论:TRF1 mRNA在ANLL细胞中表达明显降低,而在ALL细胞中表达无显著改变,提示ANLL细胞中TRF1可能通过调控端粒长度对端粒酶起间接负调控作用.

Expression of human telomere repeat binding factor1 (TRF1) in acute leukemia cells and its correlation with telomerase activities

OBJECTIVE: To study the expression of human telomere repeat binding factor 1 (TRF1) to investigate the correlation of telomerase activity with acute leukemia. METHODS: Leukemic cells were collected from 30 cases of acute leukemia. Realtime quantitative PCR with fluorescence probe hybridization was used to measure expression of TRF1 and hTERT mRNA in leukemic cells. RESULTS: TRF1 mRNA expression was 0.0126 (0.0127-0.0546) in acute non-lymphocytic leukemia (ANLL), which was lower than that in normal mononuclear cells 0.0457 (0.00839-0.262), P<0.001], but its expression in acute lymphoblastic leukemia (ALL) cells 0.0745 (1.92 x 10(-6)-0.193)] had no significant difference compared with that in normal mononuclear cells. TRF1 expression in ANLL cells was significantly lower than that in ALL cells (P=0.001). The expressions of TRF1 mRNA in AL cells and normal mononuclear cells had no significant correlation with expression of hTERT mRNA (r=-0.173, P=0.207). CONCLUSION: The expression of TRF1 is lower in ANLL cells, which indicates TRF1 may have some effect on telomerase activity by regulating telomere length in ANLL cells.