Please note that we have stopped the regular imports of Gene Expression Omnibus (GEO) data into ArrayExpress. This may not be the latest version of this experiment.
E-GEOD-18438 - Over-expression of hsa-miR-221 in JSC1 cells and identification of miRNA targets expressed in a panel of B-cell lines
Released on 5 December 2015, last updated on 12 December 2015
1) To identify changes in gene expression upon over-expression of hsa-miR-221 in JSC1 cells. 2) To identify human miRNA targets expressed in a panel of B-cell lines. Gammaherpesvirus and host cell microRNAs (miRNAs) together modulate gene expression in normal and malignant cells. Using microRNA microarrays, we determined the expression of mature viral and host cellular miRNAs in a series of B cell tumours that include Kaposi’s Sarcoma-associated herpesvirus (KSHV) infected Primary Effusion Lymphoma (PEL) and Epstein-Barr virus (EBV) infected Burkitt’s lymphoma (BL) cell lines. We show that 35 host miRNAs were constitutively expressed in all the B cell lymphomas and differences in viral miRNA expression were evident between herpesvirus positive tumour types. Furthermore, we show that in PEL, miR-221 and miR-222 expression is defective due to a lack of transcript expression rather than mutation in the miRNA encoding loci. Absence of miR-221 and miR-222 resulted in the enhanced expression of the known target gene p27 (CDKN1B) and reintroduction of miR221 in PEL reduces p27 protein expression. The dataset comes in two parts. 1) 6 JSC1 samples: 2 with miR-221 lentiviral vector, 2 without and 2 with K5 short hairpin RNA as control. 2) A panel of 14 B-cell line samples. Each of the 20 samples was Cy5 labelled and run with Cy3-labelled Stratagene reference RNA.
transcription profiling by array
Amy Buck, Dan Frampton, Eve Coulter, Paul Kellam