Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcriptional analysis of BCR-triggered immature and mature mouse B cells

ABSTRACT: The B cell antigen receptor (BCR) is a signaling complex that mediates differentiation stage-specific cell fate decisions in B lymphocytes. While several studies have evidenced differences in signal transduction components as being key to contrasting phenotypic outcomes, little is known about the differential BCR-triggered gene transcription. Here we defined transcriptional changes underlying BCR-induced apoptosis and proliferation of immature and mature B cells, respectively. These findings provide the first insights into the early transcriptional events leading to deletion or clonal expansion of B cells upon antigen recognition. Keywords: cell type comparison, development or differentiation design, time course, compound treatment design, microarray experiment record Total RNA was extracted from immature (IM) and mature (M) B cells both freshly isolated (0h) and stimulated with (BCR) or without (ctrl) anti-μ F(ab’)2 for 2, 8 or 24h. Following RNA extraction, one round of mRNA amplification was applied using the MessageAmpTM Kit (Ambion). All samples, including the amplified Universal Mouse Reference RNA (Stratagene) which served as a reference at each hybridization, were reverse-transcribed and indirectly labeled with Cy3 and Cy5 (Amersham). Quality was controlled by performing 6 or 8 hybridizations of each sample to the cDNA arrays using a dye-swap strategy. 94 arrays were used for hybridization in total.

ORGANISM(S): Mus musculus

SUBMITTER: Olivier ALIBERT

PROVIDER: E-GEOD-9215 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Prostaglandin E2 regulates B cell proliferation through a candidate tumor suppressor, Ptger4.

Murn Jernej J Alibert Olivier O Wu Ning N Tendil Simon S Gidrol Xavier X

The Journal of experimental medicine 20081215 13

B cell receptor (BCR) signaling contributes to the pathogenesis of B cell malignancies, and most B cell lymphomas depend on BCR signals for survival. Identification of genes that restrain BCR-mediated proliferation is therefore an important goal toward improving the therapy of B cell lymphoma. Here, we identify Ptger4 as a negative feedback regulator of proliferation in response to BCR signals and show that its encoded EP4 receptor is a principal molecule conveying the growth-suppressive effect ...[more]

PMID: 19075289

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Project description:Background: During gut colonization, the enteric pathogen C. jejuni has to surmount the toxic effects of reactive oxygen species produced by its own metabolism, by the host immune system and by the intestinal microflora. Elucidation of C. jejuni oxidative stress defense mechanisms is critical for understanding Campylobacter pathophysiology. Results: The mechanisms of oxidative stress defenses in Campylobacter jejuni were characterized by transcriptional profiling, genes mutagenesis, and phenotypic analysis. The transcriptome changes, in response to H2O2, cumene hydroperoxide, or menadione exposure, were found to be oxidant specific and revealed the differential expression of genes belonging to a variety of biological pathways, from the classical oxidative stress defense systems, to the heat shock response, DNA repair and metabolism, fatty acid and capsule biosynthesis, and multidrug efflux pumps. To define the peroxide sensing regulator PerR, an isogenic mutant was constructed and its transcriptome profile compared to the wild-type strain. Sixty-six genes were found to belong to the PerR regulon. PerR appear to regulate gene expression both dependently and independently of the presence of iron and/or H2O2. The perR mutant was affected in its motility and attenuated in the chick colonization model. Mutagenic and phenotypic studies of the superoxide disumutase SodB, the alkyl-hydroxyperoxidase AhpC, and the catalase KatA, revealed their role in oxidative stress defenses and chick gut colonization. Conclusion: This study reveals the interplay between PerR, the iron metabolism and the oxidative stress defenses and highlights their role in the colonization and/or survival of C. jejuni in the chick cecum. Keywords: Transcriptional response to 3 oxidants (H2O2, menadione and cumene hydroperoxide) and characterization of the perR regulon (comparison of the transciptomes from the wild-type and perR mutant). To investigate the transcriptional responses of C. jejuni to oxidant exposure, hydrogen peroxide (H2O2), cumene hydroperoxide (CHP), or menadione sodium bisulfite (MND) was added to the 50 ml broth at a final concentration of 1 mM. The same amount of water or DMSO was added to the bacterial culture that served as reference samples for the transcriptional profile study in response to H2O2, MND or CHP. Furthermore, to investigate the transcriptional response of C. jejuni to H2O2 exposure in the presence of excess iron, ferrous sulfate was added to the bacterial culture at a final concentration of 40 µM, 15 min prior to H2O2 exposure. Ten minutes after the addition of the oxidant, total RNA was extracted and processed for microarray hybridization. To identify the PerR regulon, the wild-type strain C. jejuni NCTC 11168 and the perR mutant were grown in 500 ml flasks containing 250 ml of MEMα medium. At mid-log phase, 50 ml of the cultures were transferred to 100 ml flasks and ferrous sulfate and/or H2O2 were added . Ten minutes following the addition of H2O2 the cells were collected and the total RNA extracted.

Dataset Information

Transcriptional analysis of BCR-triggered immature and mature mouse B cells

Publications

Prostaglandin E2 regulates B cell proliferation through a candidate tumor suppressor, Ptger4.

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