Project description:In multiple myeloma (MM), endothelial progenitor cells (EPCs) regulate tumor angiogenesis and disease progression. They share a common bone marrow microenvironment with myeloma tumor cells. CD138+ tumor plasma cells from 12 newly diagnosed patients with advanced MM were examined for genomic instability by RNA microarrays to assess changes in gene expression. Tumor cells were derived from single-cell suspensions of bone marrow (BM) aspirates from newly diagnosed MM patients, and RNA was extracted for microarray hybridization.
Project description:In order to identify relevant, molecularly defined subgroups in Multiple Myeloma (MM), gene expression profiling (GEP) was performed on purified CD138+ plasma cells of 320 newly diagnosed myeloma patients included in the Dutch-Belgian/German HOVON-65/ GMMG-HD4 trial using Affymetrix Gene Chip U133 plus 2.0 arrays. Hierarchical clustering identified 10 distinct subgroups. Bone marrow plasma cell samples were obtained from 320 newly diagnosed multiple myeloma patients included in a large multicenter, prospective, randomized phase III trial (HOVON65/GMMG-HD4). Purified myeloma plasma cells samples with a monoclonal plasma cell purity > 80% were used for analysis.
Project description:The iperactivation of self-renewal mechanisms, like Hedgehog (HH) pathway, which govern the refuel of Multiple Myeloma neoplastic clone, is critical to relapse events. The bulk of current knowledge is mainly based on the CD138+ cells molecular characterization, but in the light of the recent evidences, which attributed growing relevance to immature precursor clones, we become aware that multiple myeloma disease heterogeneity have more deepen roots. Here, we report on a high-throughput transcriptome study of gene expression profiles in newly diagnosed MM patients analyzed both in the CD138+ plasmacell fraction and in the CD19+ B cells compartment. Resulted data demonstrated that Hedgehog pathway, and in particular, a 10 HH-genes signature was heterogeneously expressed among MM patients, both in mature plasmacells and also in B cells at transcriptional level. Interestingly, this signature divide patients in two subgroups, and it seems that exists a sort of âying-yang effectâ between mature and immature cell compartments that are tightly regulate in order to express this relevant self-renewal pathway according to their maturation state. 144 samples have been analyzed: 126 BM-CD138+, 7 BM-B cells and 11 PBL-B cells; the homogeneity of samples has been ensured by the immunomagnetic enrichment procedure: only >90% pure cells have been employed.
Project description:The MMRC reference collection is a dataset of gene expression profiling, array comparative genomic hybridization, and re-sequencing created as a resource for the Multiple Myeloma research community. CD138 purified bone marrow cells from patients with newly diagnosed and relapsed Multiple Myeloma.
Project description:In multiple myeloma (MM), endothelial progenitor cells (EPCs) regulate tumor angiogenesis and disease progression. EPCs from 16 newly diagnosed patients with advanced MM were examined for genomic instability by aCGH to assess chromosomal gains and losses. Data were compared to aCGH results from corresponding CD138+ tumor plasma cells from these patients. EPCs and tumor cells were derived from single-cell suspensions of bone marrow (BM) aspirates from newly diagnosed MM patients, and total genomic DNA was extracted for aCGH. DNA from healthy male peripheral blood mononuclear cells (PBMCs; Promega, Madison, WI) was used as the normal control DNA.
