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Gene Expression Profiles of Multiple Myeloma from the sorted SP/LC and CD138+ cells

ABSTRACT: Gene Expression Profiles of Multiple Myeloma from the sorted SP/LC and CD138+ cells

PROVIDER: PRJNA431591 | ENA |

REPOSITORIES: ENA

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Gene Expression Profiles of Multiple Myeloma from the sorted SP/LC and CD138+ cells

Project description:Analysis of sorted SP/LC population and a CD138+ main population cells. Results provide insight into which gene is involed in the drug resistance and tumor growth enriches for cancer stem-like cells. Keywords: multiple myeloma, cancer stem cell

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Expression data of myeloma CD138+ and CD138- populations

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Affymetrix SNP array data from BM-CD138+, obtained from newly diagnosed Multiple Myeloma patients

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 “ying-yang effect” between mature and immature cell compartments that are tightly regulate in order to express this relevant self-renewal pathway according to their maturation state.

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Phenotypic, genomic and functional characterization reveals no differences between CD138++ and CD138low subpopulations in multiple myeloma cell lines

Project description:Despite recent advances in the treatment of multiple myeloma (MM), it remains an incurable disease potentially due to the presence of resistant myeloma cancer stem cells (MM-CSC). Although the presence of clonogenic cells in MM was described more than 30 years ago, the phenotype of MM-CSC is still a matter of debate, especially with respect to the expression of syndecan- 1 (CD138). Here, we demonstrate the presence of two subpopulations - CD138++ (95-99%) and CD138low (1-5%) - in eight MM cell lines. To find out possible stem-cell-like features, we have phenotypically, genomic and functionally characterized the two subpopulations. Our results show that the minor CD138low subpopulation is morphologically identical to the CD138++ fraction and does not represent a more immature B-cell compartment (with lack of CD19, CD20 and CD27 surface expression). Moreover, both subpopulations have similar gene expression and genomic profiles. Importantly, both CD138++ and CD138low subpopulations have similar sensitivity to bortezomib, melphalan and doxorubicin. Finally, serial engraftment in SCID mice shows that CD138++ as well as CD138low cells have self-renewal potential and they are also phenotypically interconvertible. Overall, our results differ from previously published data which attribute a B-cell phenotype to MM-CSC and urge the need to explore more reliable markers to discriminate true clonogenic myeloma cells.

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