We studied miRNA profiles in 4419 human samples (3312 neoplastic, 1107 nonmalignant), corresponding to 50 normal tissues and 51 cancer types. The complexity of our database enabled us to perform a detailed analysis of microRNA (miRNA) activities. We inferred genetic networks from miRNA expression in normal tissues and cancer. We also built, for the first time, specialized miRNA networks for solid tumors and leukemias. Nonmalignant tissues and cancer networks displayed a change in hubs, the most ...[more]
Project description:MicroRNA expression profiles can distinguish normal B cells from malignant B cells in chronic lymphocytic leukemia (CLL). We investigated whether microRNA profiles are associated with known prognostic factors in CLL. We evaluated the microRNa expression profiles of 94 samples of CLL cells for which ZAP-70 expression; mutations in the rearranged IgVH gene; and the time from diagnosis to initial treatment were known. We also investigated the presence of abnormalities in the genomic sequence of 42 microRNA genes.
Project description:MicroRNAs are a class of small non-coding RNAs that control gene expression by targeting messenger RNAs and triggering either translation repression or RNA degradation. Their aberrant expression may be involved in human diseases, including cancer. Indeed, microRNA aberrant expression has been previously found in human chronic lymphocytic leukemias, where microRNA signatures were associated with specific clinico-biological features. Here, we show that, in comparison to normal breast tissue, microRNAs are also aberrantly expressed in human breast cancer. The overall microRNA expression could clearly separate normal versus cancer tissues, with the most significantly deregulated microRNAs being mir-125b, mir-145, mir-21, mir-155. Results were confirmed by microarray and Northern blot analyses. We could identify microRNAs whose expression was correlated with specific breast cancer bio-pathologic features, such as estrogen and progesterone receptor expression, tumor stage, vascular invasion or proliferation index.
Project description:MicroRNA (miRNA) expression profiles for colon cancers were examined to investigate the miRNA involvement in colon carcinogenesis. miRNA microarray analysis identified statistical unique profiles, which could discriminate colon cancers from noncancerous colon tissues.
Project description:We studied the value of the microRNAs as a signature for Chronic lymphocytic leukemia (CLL) patients with specific chromosomal abnormalities. We found that MiR-181b is abiomarker of disease progression in Chronic Lymphocytic Leukemia
Project description:microRNA-expression profiling according to the Wilms tumor 1 (WT1) single nucleotide polymorphism rs16754 in adult de novo cytogenetically normal acute myeloid leukemia patients <60 years.
Project description:MicroRNA expression profiles in response to LBH589 were examined in order to identify HDACi-induced alterations in miRNA expression that regulate apoptotic signaling in chronic lymphocytic leukemia.plasia. miRNA microarray analysis identified unique alterations in miRNA profile that could be used to identify new pathways for apoptosis regulation in CLL.
Project description:MicroRNA miRNA expression profiles for human ovarian carcinomas were examined to investigate the miRNA involvement in the development of this neoplasia. miRNA microarray analysis identified statistical unique profiles, which could discriminate ovarian carcinomas from noncancerous ovarian tissues, and different groups of tumors classified according to histo-pathological characteristics.