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Transcriptional profiling of mouse B cell terminal differentiation defines a signature for antibody-secreting plasma cells

ABSTRACT: Upon encounter with antigen, mature B cells undergo complex changes in their physiological state and anatomical localization, and initiate a differentiation process that ultimately produces antibody-secreting cells (ASCs), a major effector population of the immune system. To better characterize this process we have defined the transcriptome of all stages of B cell terminal differentiation by performing a large scale RNA-seq experiment. This analysis provides a molecular signature of ASC populations that highlights the stark transcriptional divide between B cells and plasma cells, and also enables the demarcation ASCs based on location, cell cycle status and maturity. The gene expression changes strongly correlated with cell division history and the acquisition of permissive histone modifications and were clearly evident in the small subset of regulatory genes containing super-enhancers. These findings highlight the core transcriptional program that guides B cell terminal differentiation and the production of antibody, essential processes in the immune response.

ORGANISM(S): Mus musculus

PROVIDER: GSE60927 | GEO | 2015/04/01

SECONDARY ACCESSION(S): PRJNA259862

REPOSITORIES: GEO

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Project description:We have previously reported that the deficiency of p53 alone or in combination with Rb (Rb-/- p53-/-) in adipose-derived MSCs (ASCs) promotes leiomyosarcoma-like tumors in vivo. Here, we hypothesized that the source of MSCs and/or the cell differentiation stage could determine the phenotype of sarcoma development. To investigate whether there is a link between the source of MSCs and sarcoma phenotype, we generated p53-/- and Rb-/-p53-/- MSCs from bone marrow (BM-MSCs). Both genotypes of BM-MSCs initiated leiomyosarcoma formation similar to p53-/- and Rb-/-p53-/- ASCs. In addition, gene expression profiling revealed a link between p53- or Rb-p53-deficient BM-MSCs and ASCs and muscle-associated sarcomagenesis. These data suggest that the tissue source of MSC does not seem a crucial factor in the development of a particular sarcoma phenotype. To analyze whether the differentiation stage defines the sarcoma phenotype, BM-MSCs and ASCs were induced to differentiate towards the osteogenic lineage, and both p53 and Rb were excised using Cre-expressing adenovectors at different stages along osteogenic differentiation. Regardless of the level of osteogenic commitment, the inactivation of Rb and p53 in BM-MSC-derived, but not in ASC-derived, osteogenic progenitors gave rise to osteosarcoma-like tumors which could be serially transplanted. This indicates that the osteogenic differentiation stage of BM-MSCs imposes the phenotype of in vivo sarcoma development, and that BM-MSC-derived osteogenic progenitors rather than undifferentiated BM-MSCs, undifferentiated ASCs or ASC-derived osteogenic progenitors, represent the cell of origin for osteosarcoma development. To analyse whether the BM-MSC and Fat-MSC (ASC) differentiation stage may define the sarcoma phenotype, RbloxP/loxPp53loxP/loxP BM-MSCs and ASCs were induced to differentiate towards the osteogenic lineage and both Rb and p53 were excised with adenoviral vectors expressing the Cre-recombinase gene (Ad-CMV-Cre) at different stages (day 0 and 10) along osteogenic differentiation. NSG mice were inoculated subcutaneously with 5M-CM-^W10^6 mutant cells. Animals were killed when tumors reached 1 cm3 or 150 days after infusion. Some of the obtained tumors were mechanically disaggregated to establish ex vivo MSC-transformed cell lines. Gene expression analysis was performed using: WT BM-MSCs and ASCs, Rb-/-p53-/- BM-MSCs and ASCs previously differentiated to the osteogenic lineage for 10 days and a tumor cell line derived from p53-/-Rb-/- BM-MSC differentiated to the osteogenic lineage for 10 days.

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Transcriptional profiling of mouse B cell terminal differentiation defines a signature for antibody-secreting plasma cells

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