急性白血病细胞端粒酶逆转录酶(hTERT) mRNA的表达及意义

为研究原代急性白血病 (AL)骨髓单个核细胞 (MNCs)端粒酶逆转录酶 (hTERT)mRNA表达及其意义 ,采用半定量RT PCR方法检测骨髓MNCshTERTmRNA表达 ,用TRAP PCR ELISA法检测骨髓MNCs端粒酶活性。结果发现 :30例初发AL患者骨髓MNCshTERTmRNA表达量 (0 .71± 0 .34)明显高于 12例AL获CR的患者 (0 .4 3± 0 .2 5 )及 6例正常志愿者 (0 .2 2± 0 .2 1)。 30例初发AL患者骨髓MNCs端粒酶活性 (0 .2 35± 0 .395 )明显高于 12例AL获CR的患者 (0 .0 12± 0 .0 15 )。初发AL患者骨髓MNCshTERTmRNA表达量与端粒酶活性呈正相关 (r=0 .4 2 1,P <0 .0 1)。初发AL患者骨髓液常规涂片中原始细胞百分率与骨髓MNCs的hTERTmRNA表达量和端粒酶活性均呈正相关 (r =0 .4 5 7,P<0 .0 5和r =0 .4 11,P <0 .0 5 )。结论 :初发AL患者骨髓MNCs的hTERTmRNA表达与端粒酶活性相关。推测hTERTmRNA表达可能代表白血病细胞的一种高增殖状态。

The Expression of Human Telomerase Reverse Transcriptase mRNA and Its Significance in Acute Leukemia

To investigate the expression of hTERT mRNA in bone marrow mononuclear cells (MNCs) from acute leukemia patients, the method of semi-quntitative RT-PCR was used to examine the expression of hTERT mRNA in marrow MNCs, and the telomerase activity of marrow MNCs was determined with the method of TRAP-PCR-ELISA by using a commercial kit. The results indicated that the expression of hTERT mRNA of marrow MNCs in 30 untreated AL patients was markedly higher than that in 12 CR cases (0.71 +/- 0.34 vs 0.43 +/- 0.25, P < 0.05) and 6 normal volunteers (0.71 +/- 0.34 vs 0.22 +/- 0.21, P < 0.01), respectively. Telomerase activity of marrow MNCs in 30 untreated AL patients was significantly higher than that in 12 CR cases (0.235 +/- 0.395 vs 0.012 +/- 0.015, P = 0.007). Moreover, there was a positive correlation between the hTERT mRNA synthesis and telomerase activity in AL cells (r = 0.421, P < 0.01). The pencentage of blast cells in marrow smear of the untreated AL patients was positively correlated with both the expression of hTERT mRNA and the telomerase activity of bone marrow MNCs (r = 0.457, P < 0.05 and r = 0.411, P < 0.05), respectively. It is concluded that the expression of hTERT mRNA in bone marrow MNCs from untreated AL patients was correlated with their telomerase activity. It is suggested that the expression of hTERT mRNA leukemic cells indicates their higher proliferation ability.