Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling by array of Jurkat cells following miR-181 over-expression

ABSTRACT: miR-181 is often dysregulated in several types of cancer. This dataset can represent a further insight into gene expression changes and GO Terms associated with miR-181 over-expression. miR-181 was over-expressed in Jurkat cells by transduction with a lentiviral transgenic construct encoding for miR-181 under a PGK promoter. A cognate vector encoding for a control hairpin was used to generate control cell line. mRNA Microarray gene expression profiling of Jurkat cells tranduced with either a miR-181 sponge or control construct. 3 biological replicas have been performed. Note that the control samples are the same as those used in the related experiment E-MTAB-4588

ORGANISM(S): Homo sapiens

SUBMITTER: Silvia Gioiosa

PROVIDER: E-MTAB-4602 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The miR-29 family is an important player in the molecular pathophysiology of distinct types of cancer, with roles that seems to depend on cellular context. Reduced miR-29 levels are associated with more aggressive disease and its overexpression in cancer and leukemic cell lines inhibits proliferation. In contrast, its overexpression in hematopoietic progenitors, promotes leukemogenesis. We explored the potential roles of miR-29a in the molecular pathophysiology of T-cell acute lymphoblastic leukemia (T-ALL). As compared to normal T-cells, miR-29a levels are extremely reduced in T-ALL and in the Jurkat cell line. Microarrays analysis in Jurkat cells, following the introduction of synthetic miR-29a mimics, revealed the down-regulation of several predicted targets, including previously described targets (DNMT3a/b, CDK6, PXDN, MCL1, PIK3R1 and CXXC6), and novel targets with roles in active DNA demethylation, such as members of the ten-eleven-translocation (TET) family and TDG. Reduced miR-29a levels contribute to altered epigenetics, as its introduction in Jurkat cells, promotes the demethylation of the AHR gene (commonly methylated in T-ALL). In T-ALL patients, miR-29a levels are significantly associated with blast counts and disease free survival. Our results highlight the relevance of miR-29 in T-ALL physiopathology, and may help to clarify some contrasting findings reported in the literature. In order to identify potential miR-29a targets in T-cell lymphoblastic leukemia, Jurkat cells were electroporated with synthetic RNA molecules corresponding to miR-29a mimics (pre-miR) or inhibitors (anti-miR); and microarray profiles were compared to the profiles of Jurkat cells eletroporated with the corresponding negative controls. Transcripts with levels reduced following the introduction of the pre-miR-29a (as compared to pre-miR-Control), or transcripts acumulated folowing introduction of the anti-miR-29a inhibitor (as compared to anti-miR-Control), were considered potential targets; and were further compared to microRNA target prediction databases. Two paired samples were used for this analysis.

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Transcription profiling by array of Jurkat cells following miR-181 over-expression

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