miRNA expression profiles in chronic lymphocytic and acute lymphocytic leukemia
Braz. j. med. biol. res
; 40(11): 1435-1440, Nov. 2007. graf, tab
Artículo
en Inglés
| LILACS
| ID: lil-464315
Biblioteca responsable:
BR1.1
ABSTRACT
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® MicroRNA Assays Human Panel (Applied Biosystems). Pooled leukemia samples were compared to pooled CD19+ samples from healthy individuals (calibrator) by the 2-DD 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 up-regulated 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.
Texto completo:
Disponible
Colección:
Bases de datos internacionales
Base de datos:
LILACS
Asunto principal:
Leucemia Linfocítica Crónica de Células B
/
MicroARNs
/
Leucemia-Linfoma Linfoblástico de Células Precursoras
Tipo de estudio:
Estudio observacional
/
Factores de riesgo
Límite:
Humanos
Idioma:
Inglés
Revista:
Braz. j. med. biol. res
Asunto de la revista:
Biologia
/
Medicina
Año:
2007
Tipo del documento:
Artículo
País de afiliación:
Argentina
/
Brasil
Institución/País de afiliación:
Applied Biosystems do Brasil/BR
/
Centro Regional de Hemoterapia/BR
/
Universidade de São Paulo/BR