Human lymphoma cells: BLS type vs. conventional diffuse large B-cell lymphoma (DLBCL)
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PROVIDER: PRJNA562670 | ENA |
REPOSITORIES: ENA
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Project description:mRNA profiling of BLS type DLBCL cells comparing with conventional DLBCL cells. The former were sorted from bone marrow and the latter were isolated from pleural effusions by using magnetic microbeads coated with anti-CD20 antibody after loaded onto a column. The goal was to determine the global genes upregulated in BLS type DLBCL.
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Project description:Transformation of Follicular Lymphoma to Diffuse Large Cell Lymphoma: Alternative Patterns with Increased or Decreased Expression of c-myc and its Regulated genes The natural history of follicular lymphoma (FL) is frequently characterized by transformation to a more aggressive diffuse large B cell lymphoma (DLBCL). We compared the gene expression profiles between transformed DLBCL and their antecedent FL. No genes were observed to increase or decrease their expression in all the cases of histological transformation. However, two different gene expression profiles associated with the transformation process were defined, one in which c-myc and genes regulated by c-myc showed increased expression and one in which these same genes showed decreased expression. Further, there was a striking difference in gene expression profiles between transformed DLBCL and de novo DLBCL, since the gene expression profile of transformed DLBCL was more similar to their antecedent FL than to de novo DLBCL. The study demonstrates that transformation from FL to DLBCL can occur by alternative pathways and that transformed DLBCL and de novo DLBCL have very different gene expression profiles that may underlie the different clinical behaviors of these two types of morphologically similar lymphomas.
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Project description:The aggressive B cell lymphoma diffuse large B cell lymphoma (DLBCL) is a heterogeneous entity that requires more precise monitoring and prognosis molecular tools. Extracellular vesicles that are secreted by all cell types are currently recognized as serving as a proxy for the cell of origin. Utilizing cutting-edge mass spectrometry, the current study described and assessed the plasma small extracellular vesicles (sEVs) proteome's diagnostic and prognostic potential. The presence of DLBCL has a significant impact on the sEV proteome, and several proteins substantially correlate with DLBCL.Nevertheless, no proteins that highly correlated with non-GCB or GCB were found.
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Project description:miRNA profiling of human Diffuse Large B Cell Lymphoma (DLBCL) cell lines derived from the two main subtypes of this disease: Activated B Cell like (ABC-DLBCL) and Germinal Center B cell like (GCB-DLBCL), analyzing the 711 human miRNAs present in miRBase V10.0. Five ABC-like DLBCL cell lines (RIVA, Oci-Ly3, Oci-Ly10, HBL1 and U2932) and three GCB-like DLBCL cell lines (Oci-Ly7, Oci-Ly19 and SUDHL-6) were cultured in IMDM (Cellgro) with 20% human plasma, 1% penicillin/streptomycin/L-glutamine (Cellgro,) and 0,2% beta mercaptoethanol (Invitrogen). Total RNA was extracted from cell pellets using the mirVana™ miRNA Isolation Kit (Ambion), and sent to LC Sciences facility for microarray hybridization using microfluidics technology. FirstChoice® Human Skeletal Muscle Total RNA (Ambion) was used as common reference for all hybridizations. Background substracted and normalized data from each channel was used to calculate log ratios sample/reference. Keywords: miRNA profiling
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Project description:Diffuse large B-cell lymphoma (DLBCL), the most common subtype of non-Hodgkin's lymphoma, is clinically heterogeneous: 40% of patients respond well to current therapy and have prolonged survival, whereas the remainder succumb to the disease. We proposed that this variability in natural history reflects unrecognized molecular heterogeneity in the tumors. Using DNA microarrays, we have conducted a systematic characterization of gene expression in B-cell malignancies. Here we show that there is diversity in gene expression among the tumors of DLBCL patients, apparently reflecting the variation in tumor proliferation rate, host response and differentiation state of the tumor. We identified two molecularly distinct forms of DLBCL which had gene expression patterns indicative of different stages of B-cell differentiation. One type expressed genes characteristic of germinal center B cells ('germinal center B-like DLBCL'); the second type expressed genes normally induced during in vitro activation of peripheral blood B cells ('activated B-like DLBCL'). Patients with germinal center B-like DLBCL had a significantly better overall survival than those with activated B-like DLBCL. The molecular classification of tumors on the basis of gene expression can thus identify previously undetected and clinically significant subtypes of cancer. This study is described more fully in Alizadeh AA et al.(2000) Nature 403:503-11
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