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GSE27674
Pseudomonas aeruginosa
4 Downloadable Samples
Affymetrix Pseudomonas aeruginosa Array (paeg1a)
Description
Many Gram-negative bacteria employ cell-to-cell communication mediated by N-acyl homoserine lactones (quorum sensing) to control expression of a wide range of genes including, but not limited to, genes encoding virulence factors. Outside the laboratory, the bacteria live in complex communities where signals may be perceived across species. We here present a newly found natural quorum sensing inhibitor, produced by the pseudomonads Pseudomonas sp. B13 and Pseudomonas reinekei MT1 as a blind end in the biodegradation of organochloride xenobiotics, which inhibits quorum sensing in P.aeruginosa in naturally occurring concentrations. This catabolite, 4-methylenebut-2-en-4-olide, also known as protoanemonin, has been reported to possess antibacterial properties, but seems to have dual functions. Using transcriptomics and proteomics, we found that protoanemonin significantly reduced expression of genes and secretion of proteins known to be under control of quorum sensing in P.aeruginosa. Moreover, we found activation of genes and gene products involved in iron starvation response. It is thus likely that inhibition of quorum sensing, as the production of antibiotics, is a phenomenon found in complex bacterial communities.
Publication Title
Protoanemonin: a natural quorum sensing inhibitor that selectively activates iron starvation response.
Sample Metadata Fields
Compound
View Samples- Mus musculus
- 11 Downloadable Samples
- Affymetrix Mouse Genome 430 2.0 Array (mouse4302)
Description
Type I Interferons encompasses a large family of closely related cytokines comprising of at least 13 IFN- isotypes and single IFN-. Both IFN- and IFN- exert their activity through a common receptor IFNAR. Type I Interferons have broad regulatory effects and various subtypes of dendritic cells are influenced by this cytokines. In our study we asked question whether the low, constitutive levels of type I Interferons produced under steady state conditions are important for proper function of splenic conventional dendritic cells.
Publication Title
Absence of IFN-beta impairs antigen presentation capacity of splenic dendritic cells via down-regulation of heat shock protein 70.
Sample Metadata Fields
Sex, Age, Specimen part
View Samples- Mus musculus
- 64 Downloadable Samples
Illumina HiSeq 1500
Description
Differentiation of haematopoietic stem cells followsa hierarchical program of transcription-factor regulated events. Early myeloid cell differentiation is dependent on PU.1 and CEBPA (CCAAT/enhancer binding protein alpha), late myeloid differentiation is orchestrated by CEBPE (CCAAT/enhancer binding protein epsilon). The influence of SWI/SNF (SWItch/Sucrose Non-Fermentable) chromatin remodelling factors as novel master regulators of haematopoietic differentiation is only beginning to be explored. Here, we identified three homozygous loss-of-function mutations in SMARCD2 (SWI/SNF related, matrix associated, actin dependent regulator of chromatin, subfamily d, member 2), a member of the SWI/SNF complex, in three unrelated pedigrees. We find that SMARCD2-deficient hematopoiesis results in dysfunctional neutrophil granulocytes, characterized by specific granule deficiency, myelodysplasia, and an excess of blast cells. We can show that SMARCD2 controls early steps in the differentiation of myeloid-erythroid progenitor cells in mice and zebra fish. In vitro SMARCD2 interacts with the transcription factor CEBPE. Furthermore, we find that SMARCD2 controls expression of neutrophil proteins stored in specific granules and leads to transcriptional and chromatin changes in AML cells. Hence, we identify SMARCD2 as a key factor controlling myelopoiesis and as a potential tumour suppressor in leukemia. Overall design: We analyzed CD45.2+ Lin- Mac+/low Sca1+ cKit+ (LSK) cells from Smarcd2 wild-type, heterozygous and mutant foetal livers in at least 5 replicates Additionally, we analysed three different progenitor populations from Smarcd2 wild-type and homozygous knock-out foetal livers: CD45+Lin-Sca-1-CD177+CD34lowCD16/32 (FCGR)low(MEP) CD45+Lin-Sca-1-CD177+CD34+CD16/32(FCGR)int (CMP) CD45+Lin-Sca-1-CD177+CD34+CD16/32(FCGR)high (GMP)
Publication Title
Chromatin-remodeling factor SMARCD2 regulates transcriptional networks controlling differentiation of neutrophil granulocytes.
Sample Metadata Fields
Sex, Specimen part, Cell line, Subject
View Samples- Homo sapiens
- 11 Downloadable Samples
- Affymetrix Human Gene 1.0 ST Array (hugene10st)
Description
Peripheral blood lymphocytes were separated in the Ficoll gradient and subjected for stimulation with anti-CD3 and anti-CD28 antiobodies upon time (6h, 12h and 18h). Next, total RNA was isolated and trenscriptional analysis of stimulated cells was performed.
Publication Title
Loss-of-function mutations in the IL-21 receptor gene cause a primary immunodeficiency syndrome.
Sample Metadata Fields
Time
View Samples- Mus musculus
- 18 Downloadable Samples
- Illumina HiSeq 2500
Description
Gprc6a|Mck-/- (Gcrp6a skeletal muscle specific knockout)(n=4) are compared to Gprc6afl/fl (WT) mice (n=4). Gprc6a is the osteocalcin receptor. Overall design: Gprc6a/Mck-/- vs Gprc6afl/fl
Publication Title
Osteocalcin Signaling in Myofibers Is Necessary and Sufficient for Optimum Adaptation to Exercise.
Sample Metadata Fields
Specimen part, Subject
View Samples- Homo sapiens
- 20 Downloadable Samples
- Affymetrix Human Genome U133 Plus 2.0 Array (hgu133plus2)
Description
Lymphoblast cells from a patient with Freidriech's Ataxia were incubated with pyrrole-imidazole polyamides targeted to the GAA triplet repeat in the intron 1. The polyamides were shown in cell culture to increase levels of endogenous frataxin mRNA. A normal sibling derived lymphoblast cell line was used as a control.
Publication Title
DNA sequence-specific polyamides alleviate transcription inhibition associated with long GAA.TTC repeats in Friedreich's ataxia.
Sample Metadata Fields
No sample metadata fields
View Samples- Homo sapiens
- 108 Downloadable Samples
- Affymetrix Human Genome U133A Array (hgu133a)
Description
Staphylococcus aureus has emerged as a significant pathogen causing severe, invasive disease in otherwise healthy people. Despite considerable advances in understanding the epidemiology, resistance mechanisms, and virulence factors produced by the bacteria, there is limited knowledge of the in vivo host immune response to acute, invasive S. aureus infections. Herein, we report that peripheral blood mononuclear cells from patients with severe S. aureus infections demonstrate a distinctive and robust gene expression profile which is validated in a distinct group of patients and on a different microarray platform. Application of a systems-wide modular analysis framework reveals significant over-expression of innate immunity genes and under-expression of genes related to adaptive immunity. Simultaneous flow cytometry analyses demonstrated marked alterations in immune cell numbers, with decreased central memory CD4 and CD8 T cells and increased number of monocytes. CD14+ monocyte numbers significantly correlated with the gene expression levels of genes related to the innate immune response. These results demonstrate the value of applying a systems biology approach that reveals the significant alterations in the components of circulating blood lymphocytes and monocytes in invasive S. aureus infections.
Publication Title
Enhanced monocyte response and decreased central memory T cells in children with invasive Staphylococcus aureus infections.
Sample Metadata Fields
Sex, Treatment, Race
View Samples- Arabidopsis thaliana
- 4 Downloadable Samples
- Affymetrix Arabidopsis ATH1 Genome Array (ath1121501)
Description
We treated Arabidopsis seedlings with chitosan and carried out a transcript profiling analysis (GeneChip microarrays) in order to identify genes and transcription factors regulated by chitosan. The results showed that jasmonate and defense responsive genes, camalexin and lignin biosynthetic genes were among genes up-regulated by chitosan. Several transcription factors are also strongly induced by chitosan.
Publication Title
Transcript profiling of chitosan-treated Arabidopsis seedlings.
Sample Metadata Fields
Age, Treatment
View Samples- Mus musculus
- 4 Downloadable Samples
- Illumina HiSeq 2000
Description
We recently described TRIM8, a nuclear E3 ubiquitin ligase, whose expression inversely correlates with glioma grade. TRIM8 restoration suppresses cell growth and induces a significant reduction of clonogenic potential in both U87MG glioblastoma and patients' primary glioma cell lines. Since E3 ubiquitin ligase proteins regulate carcinogenesis through the timely control of many cellular processes such as DNA damage response, metabolism, transcription, and apoptosis, we reasoned that TRIM8 activity might impact on cell transcriptome patterns, thereby promoting cancer development and progression. Therefore, we profiled the whole transcriptome of normal embryonic neural stem cells (eNSC) infected with a retrovirus expressing FLAG-Trim8 by using RNA-Seq. RNA-Seq revealed 1365 differentially expressed transcripts of 912 genes. 723 of them (corresponding to 648 RefSeq genes) differed significantly of at least 1.5 folds (192 upregulated transcripts of 178 genes and 531 downregulated transcripts of 470 genes). 80 genes, among all differentially expressed genes, resulted to significantly enrich 18 pathways by IPA analysis. 53% of these genes (43 out of 80 genes) are related to cell-morphology, cell death and survival, with a preponderantly representation of signaling pathways related to neurotransmission and to CNS, including axonal guidance, GABA Receptor, ephrin B, synaptic long-term potentiation/depression, and glutamate receptor. Specifically, our results substantiate the role of TRIM8 in the brain functions through the dysregulation of genes involved in different pathways, including JAK-STAT. Finally, we provided additional evidence about the existence of a functional interactive crosstalk between TRIM8 and STAT3 with possible implications in the development and progression of glioma. Overall design: Profiling the transcriptome of TRIM8-expressing primary mouse embryonal neural stem cells using RNA-Seq
Publication Title
TRIM8-driven transcriptomic profile of neural stem cells identified glioma-related nodal genes and pathways.
Sample Metadata Fields
Specimen part, Subject
View Samples- Homo sapiens
- 4 Downloadable Samples
- Affymetrix Human Gene 2.0 ST Array (hugene20st)
Description
Transcriptomic characterization of BDE-47 exposed cultured primary human cytrophoblasts (2nd trimester) undergoing differentiation in vitro.
Publication Title
Genomic Profiling of BDE-47 Effects on Human Placental Cytotrophoblasts.
Sample Metadata Fields
No sample metadata fields
View Samples