miRNA expression profiles in chronic lymphocytic and acute lymphocytic leukemia

被引:146
作者
Zanette, D. L.
Rivadavia, F.
Molfetta, G. A.
Barbuzano, F. G.
Proto-Siqueira, R.
Falcao, R. P.
Zago, M. A.
Silva, W. A., Jr.
机构
[1] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Genet, Ribeirao Preto, Brazil
[2] Univ Sao Paulo, Fac Med Ribeirao Preto, Dept Clin Med, Ribeirao Preto, Brazil
[3] Ctr Terapia Celular, Ctr Reg Hemoterapia, CEPID, FAPESP, Ribeirao Preto, Brazil
[4] Appl Biosyst Brasil, Sao Paulo, Brazil
关键词
non-coding RNA; MicroRNA; hematopoietic malignancies; leukemia; miR-331;
D O I
10.1590/S0100-879X2006005000179
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
MicroRNAs ( miRNAs) are a class of small endogenous RNAs that play important regulatory roles by targeting mRNAs for cleavage or translational repression. miRNAs act in diverse biological processes including development, cell growth, apoptosis, and hematopoiesis, suggesting their association with cancer. We determined the miRNA expression profile of chronic and acute lymphocytic leukemias ( CLL and ALL) using the TaqMan (R) MicroRNA Assays Human Panel ( Applied Biosystems). Pooled leukemia samples were compared to pooled CD19(+) samples from healthy individuals ( calibrator) by the 2(-Delta Delta Ct) method. Total RNA input was normalized based on the Ct values obtained for hsa-miR-30b. The five most highly expressed miRNAs were miR-128b, miR-204, miR-218, miR-331, and miR-181b-1 in ALL, and miR-331, miR-29a, miR-195, miR-34a, and miR-29c in CLL. To our knowledge, this is the first report associating miR-128b, miR-204 and miR-331 to hematological malignancies. The miR-17-92 cluster was also found to be up-regulated in ALL, as previously reported for some types of lymphomas. The differences observed in gene expression levels were validated for miR-331 and miR-128b in ALL and CD19(+) samples. These miRNAs were upregulated in ALL, in agreement with our initial results. A brief target analysis was performed for miR-331. One of its putative targets, SOCS1, promotes STAT activation, which is a known mediator of cell proliferation and survival, suggesting the possibility of an association between miR-331 and these processes. This initial screening provided information on miRNA differentially expressed in normal and malignant B-cells that could suggest the potential roles of these miRNAs in hematopoiesis and leukemogenesis.
引用
收藏
页码:1435 / 1440
页数:6
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