摘要
为了观察了解儿童急性白血病细胞中转录因子PAX5的表达特性,采用实时定量RT-PCR方法测定了6个血液肿瘤细胞株以及6例正常儿童、58例初发和4例复发急性白血病儿童(其中包括39例B-ALL,10例T-ALL和13例AML)骨髓细胞中PAX5和CD19mRNA的表达水平。结果表明:在Namalwa(B细胞系)细胞株中,PAX5和CD19mRNA相对表达量分别为2.35%和2.52%;而在T-和髓系细胞株中几乎不表达。在临床样本中B-ALL组比T-ALL组和AML组的PAX5mRNA表达高(P=0.029和P=0.013)。T-ALL组和AML组的PAX5mRNA表达水平均低于正常对照组,而T-ALL组与AML组之间的表达差异无显著意义。在B-ALL患儿中,PAX5mRNA表达的个体差异很大。此外还发现,初发治疗前组和复发组的B-ALL患儿PAX5mRNA表达高于化疗完全缓解组(P=0.011和P=0.006)。由于在CD19基因的启动子上有B细胞特异性激活蛋白的结合位点,研究发现在B-ALL中PAX5表达水平与同样用实时定量RT-PCR检测的CD19表达水平之间存在明显的相关性。结论:运用实时定量RT-PCR方法能快速准确地在B-ALL的临床标本中检测和定量PAX5基因的表达。研究中发现部分B-ALL中PAX5mRNA表达明显升高,因此它可将其作为进一步研究B-ALL发病机理的另一个切入点。
To investigate transcription factor PAX5 expression characteristics in childhood acute leukemic cells, expression levels of PAX5 and CD19 mRNA in 6 hematological tumor cell lines and bone marrow cells of 6 normal children, 58 de novo patients and 4 relapse acute leukemic children, including 39 cases of B-ALL, 10 cases of T-ALL and 13 cases of AML, were detected by a real-time RT-PCR. The results showed that PAX5 and CD19 mRNA expression levels were 2.35 % and 2.52% in Namalwa （ B-cell lines） respectively, but almost not detectable in other T- and myeloid cell lines. Among clinical samples, expression of PAX5 mRNA in B-ALL was significantly higher than that in T-ALL and AML（P=0. 029 and P =0. 013 respectively）. PAX5 expression was significantly lower in T-ALL and AML than that in normal controls. The difference of PAX5 mRNA expression levels between T-ALL and AML was not significant. Individual difference of PAX5 mRNA expression levels in children with B-ALL was great. Moreover, PAX5 mRNA expressions in de novo and relapse patients with B-ALL were significantly higher than those in remission （ P = 0.011 and P = 0. 006 respectively）. As binding sites for B-cell specific activator protein have been identified in the promoter regions of CD19, the study found that in B-ALL, there was clear correlation between the expression levels of PAX5 and CD19, which was also studied by real-time RT-PCR. It is concluded that PAX5 transcripts are readily detectable and quantifiable in clinical materials with B-ALL by real-time RT-PCR. The strong PAX5 mRNA expression in some B-ALL can be considered to be particularly interesting for further analysis.
出处
《中国实验血液学杂志》
CAS
CSCD
2006年第1期6-10,共5页
Journal of Experimental Hematology
