急性白血病病人骨髓细胞胞苷脱氨酶基因表达的研究

Expression of Cytidine Deaminase mRNA in Bone Marrow Cells from Patients with Acute Leukemia

本研究的目的是测定胞苷脱氨酶 (cytidinedeaminase ,CDD)在正常骨髓细胞和不同病期急性白血病 (AL)病人细胞内mRNA的表达水平 ,并探讨该酶与临床的关系。研究采用半定量逆转录 聚合酶链反应 (RT PCR)检测83例AL病人 (初治 31例、复发难治 2 9例、缓解 2 3例 )和 15例正常人的骨髓细胞CDD表达 ,以CDD/ β actin大于或等于 0 5定为高表达。结果显示 ,CDD基因表达量在初治和难治复发病例中分别为 0 .4 90 5± 0 .2 85 11和 0 .4 96 9± 0 3180 2 ,高表达率分别为 4 8.3%和 5 1.7%;在完全缓解病例和正常人中分别为 0 .3338± 0 .2 3838和 0 .3193±0 15 390 ,高表达率分别为 13.3%和 15 .4 %;初治和难治复发病例的CDD基因表达量显著高于完全缓解病例和正常人 (P <0 .0 5 ) ,但初治与难治复发病例之间、完全缓解病例与正常人之间无显著差异 (P >0 .0 5 ) ;难治复发病例中ALL的CDD表达量显著高于AML(0 .75 0 4± 0 .10 939vs 0 .4 336± 0 .3372 5 ;P <0 .0 5 ) ;初治 3例高表达中 2例缓解 ,1例未缓解 ,5例低表达全部缓解 ;难治复发 8例高表达中 3例缓解 ,5例未缓解 ,10例低表达中 4例缓解 ,6例未缓解 ,但未发现缓解率存在有显著性差异 (P >0 .0 5 )。结论 :CDD在AL的不同病期表达水平不同 。

The aim of the study was to determine the expression of cytidine deaminase (CDD) gene in bone marrow cells from patients with acute leukemia (AL) and evaluate the relationship between CDD expression and clinical feature. Semi quantitative reverse transcription polymerase chain reaction (RT PCR) was used for detection of expression level of CDD mRNA in bone marrow cells from 83 patients with acute leukemia and from 15 healthy peoples as control. CDD/β actin ratio≥0.5 was considered to be positive. The results showed that expression levels of CDD of 31 previously untreated patients were higher than those of 23 cases of AL in complete remission and of normal controls. Expression levels of CDD of 29 relapse/refractory patients were also higher than those of 23 AL patients in complete remission and of normal subjects. The expression levels of CDD in relapse/refractory ALL were higher than those in AML while expression levels of CDD were not correlated with the outcome of therapy. It is concluded that the level of CDD mRNA expression varies at the different stage of acute leukemia. The expression level of CDD seems not to be a prognostic factor.