急性白血病hTERT mRNA和P16蛋白表达与端粒酶活性的关系

Relationship of the expression of hTERT mRNA and P16 protein with telomerase activity in acute leukemia

目的 探讨端粒酶逆转录酶 (hTERT)和P16蛋白表达与端粒酶活性的关系及其在急性白血病发病过程中的作用。方法 采用TRAP和RT PCR法分别检测 4 0例急性白血病患者 (白血病组 )及 2 0例非白血病且骨髓正常者 (对照组 )的端粒酶活性与hTERTmRNA表达 ;用免疫组化SP法测定P16蛋白表达。结果 白血病组端粒酶活性和hTERTmRNA的阳性率分别为 75 %和 80 % ,而对照组均为阴性。白血病组hTERTmRNA表达与端粒酶活性呈显著正相关 (r =0 .6 5 ,P <0 .0 1)。白血病组及对照组P16蛋白阳性表达率分别为 35 %和 95 % ,两者比较差异有非常显著性意义 (P <0 .0 1)。白血病组P16蛋白表达与端粒酶活性呈显著负相关 (r =- 0 .81,P <0 .0 1)。结论 hTERTmR NA表达和 p16基因失活可能在急性白血病发病过程中起一定作用。急性白血病细胞端粒酶活性激活可能与hTERTmRNA表达及 p16基因失活有关。

Objective To study the expression of human telomerase reverse transcriptase (hTERT) and P16 protein and their relation with telomerase activity in the carcinogenesis of acute leukemia. Methods Telomerase activity and hTERTmRNA were detected in 40 patients with acute leukemia and 20 normal controls by TRAP and RT-PCR, respectively; P16 protein was examined by immunocytochemical method. Results The positive rates of telomerase activity and hTERTmRNA were 75% and 80% in 40 cases of acute leukemia, respectively, whereas neither hTERTmRNA nor telomerase activity was detected in normal controls. There was a significant correlation between the expression of hTERTmRNA and telomerase activity (r= 0.65, P< 0.01). It was found that P16 protein was 35% (14/40) in acute leukemia and 95% (19/20) in normal controls (P< 0.01). The expression of P16 protein was found to be inversely correlated with telomerase activity (r=- 0.81, P< 0.01). Conclusion The expression of hTERTmRNA and inactivation of p16 may play an important role in the carcinogenesis of acute leukemia.