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GSE6451
Homo sapiens
6 Downloadable Samples
Affymetrix Human Genome U133 Plus 2.0 Array (hgu133plus2)
Description
The antioxidant response element (ARE) is a cis-acting regulatory enhancer element found in the 5 flanking region of many phase II detoxification enzymes. Upregulation of ARE-dependent target genes is known to have neuroprotective effects; yet, the mechanism of activation is largely unknown. By screening an arrayed collection of approximately 15,000 full-length expression cDNAs in the human neuroblastoma cell line IMR-32 with an ARE-luciferase reporter, we have identified several cDNAs not previously associated with ARE activation. A subset of cDNAs, including sequestosome 1 (SQSTM1) and dipeptidylpeptidase III (DPP3), activated the ARE in primary mouse-derived cortical neurons. Overexpression of SQSTM1 and DPP3 in IMR-32 cells stimulated NRF2 nuclear translocation and led to increased levels of NAD(P)H:quinone oxidoreductase 1 (NQO1), a protein which is transcriptionally regulated by the ARE. When transfected into IMR-32 neuroblastoma cells that were depleted of transcription factor NRF2 by RNA interference, SQSTM1 and DPP3 were unable to activate the ARE or induce NQO1 expression, indicating that the ARE activation upon ectopic expression of these cDNAs is mediated by NRF2. Studies with pharmacological inhibitors indicated that 1-phosphatidylinositol 3-kinase (PI3K) and protein kinase C (PKC) signaling are also essential for activity. Lastly, overexpression of these cDNAs conferred partial resistance to hydrogen peroxide induced toxicity, consistent with the induction of antioxidant and phase II detoxification enzymes which can protect from oxidative stress. This work and other such studies may provide mechanisms for activating the ARE in the absence of general oxidative stress, and a novel therapeutic approach to degenerative diseases and aging.
Publication Title
A genomic screen for activators of the antioxidant response element.
Sample Metadata Fields
No sample metadata fields
View Samples- Pseudomonas aeruginosa
- 4 Downloadable Samples
- Affymetrix Pseudomonas aeruginosa Array (paeg1a)
Description
Quorum sensing (QS) is a mechanism of bacterial gene regulation in response to increases in population density. Production of small molecule QS signals, their accumulation within a diffusion-limited environment and their binding to the LuxR-type receptor trigger QS-controlled gene regulatory cascades. QS pathways mediated by acylhomoserine lactones (AHLs) in Gram-negative bacteria are the best studied. In Pseudomonas aeruginosa, for example, binding of AHLs to their cognate receptors (LasR, RhlR) controls production of virulence factors, pigments, antibiotics and other behaviors important for its interactions with eukaryotic hosts and other bacteria. We isolated a new small cyclopropane-containing fatty acid, lyngbyoic acid (1), as a major metabolite of the marine cyanobacterium, Lyngbya sp., collected off Fort Pierce, Florida. The structure of 1 was determined by NMR, MS and optical rotation. We screened 1 against four reporters based on AHL receptors from Vibrio fischeri (LuxR), Aeromonas hydrophila (AhyR), Agrobacterium tumefaciens (TraR) and P. aeruginosa (LasR) and found that 1 most strongly affected LasR. We show, by using a defined set of reporters, that compound 1 acts both through the AHL-binding site of LasR and independent of it. We also show that 1 reduces pyocyanin and LasB, both on the protein and transcript level, in wild-type P. aeruginosa, and that 1 directly inhibits LasB enzymatic activity. Conversely, dodecanoic acid (11) increased pyocanin and LasB, demonstrating that 1 is a tagged fatty acid potentially resistant to -oxidation.
Publication Title
Lyngbyoic acid, a "tagged" fatty acid from a marine cyanobacterium, disrupts quorum sensing in Pseudomonas aeruginosa.
Sample Metadata Fields
No sample metadata fields
View Samples- Homo sapiens
- 7 Downloadable Samples
- Affymetrix Human Genome U133 Plus 2.0 Array (hgu133plus2)
Description
Microarray profiling using the Affymetrix GeneChip Human Genome U133 plus 2.0 arrays was performed to comprehensively determine global changes in transcript levels in bronchial epithelial cells following elastase treatment. Elastase caused a significant change in expression (P < 0.05, fold change 1.5) of 364 transcripts corresponding to 348 genes. Elastase affected the expression of signaling molecules including chemokines, cytokines, and receptors, as well as components of the spliceosome, transcription machinery, cell cycle and ubiquitin-mediated proteolysis.
Publication Title
Potent elastase inhibitors from cyanobacteria: structural basis and mechanisms mediating cytoprotective and anti-inflammatory effects in bronchial epithelial cells.
Sample Metadata Fields
Specimen part, Treatment
View Samples- Homo sapiens
- 8 Downloadable Samples
- Affymetrix Human Genome U133 Plus 2.0 Array (hgu133plus2)
Description
Histone deacetylases (HDACs) regulate gene expression. Inhibition of class I HDACs has been shown to inhibit cancer cell growth. Largazole, a new potent HDAC inhibitor, shows strong antitumor activity, presumably by modulating transcription of cancer relevant genes.
Publication Title
Anticolon cancer activity of largazole, a marine-derived tunable histone deacetylase inhibitor.
Sample Metadata Fields
Specimen part, Cell line, Treatment
View Samples- Homo sapiens
- 26 Downloadable Samples
- Affymetrix Human Genome U133A Array (hgu133a)
Description
Total RNA was extracted from apratoxin A or vehicle treated HT29 cells using the RNeasy Mini Kit (Qiagen). Probe values from CEL files were condensed to probe sets using Rosetta Resolver software. Resolver ANOVA analysis was then performed between groups.
Publication Title
A functional genomics approach to the mode of action of apratoxin A.
Sample Metadata Fields
No sample metadata fields
View Samples- Homo sapiens
- 8 Downloadable Samples
- Affymetrix Human Transcriptome Array 2.0 (hta20)
Description
To elucidate the mode of action of apratyramide, we performed microarray profiling using the Affymetrix GeneChip Human Transcriptome Array 2.0 to determine global changes in transcript levels in HaCaT cells treated with apratyramide. Comparativel analysis identified 371 differentially expressed genes after 12 h treatment with 30 M apratyramide (p < 0.05, FDR corrected, fold change >1.5 or <0.67). Consistent with our previous data, VEGF-A appeared to be one of the most up-regulated genes. To examine the molecular functions and genetic networks, the microarray data was analyzed using Ingenuity Pathways Aanalysis (IPA).The global changes of transcript levels are associated with increased downstream phenotypic effects including angiogenesis, mitogenesis, differentiation of epithelial tissue and formation of skin, and decreased effects such as apoptosis of liver cells and hypoplasia of organs. IPA analysis of 371 microarray hits indicated the unfolded protein response (UPR) as the top canonical pathway with a p-value of 1.45 10-16. The IPA also elucidated that the 371 hits were most related to a molecular network associated with the function of cellular compromise and cellular maintenance. The network contains molecular components from UPR pathway, NRF2-mediated oxidative stress response signaling as well as glucocorticoid receptor signaling.
Publication Title
Apratyramide, a Marine-Derived Peptidic Stimulator of VEGF-A and Other Growth Factors with Potential Application in Wound Healing.
Sample Metadata Fields
Treatment
View Samples- Homo sapiens
- 4 Downloadable Samples
- Affymetrix Human Exon 1.0 ST Array [transcript (gene) version (huex10st)
Description
In acute promyelocytic leukemia (APL), differentiation therapy with all-trans retinoic acid (ATRA)
Publication Title
Chemokine induction by all-trans retinoic acid and arsenic trioxide in acute promyelocytic leukemia: triggering the differentiation syndrome.
Sample Metadata Fields
Specimen part
View Samples- Mus musculus
- 6 Downloadable Samples
- Illumina MouseWG-6 v2.0 expression beadchip
Description
This SuperSeries is composed of the SubSeries listed below.
Publication Title
KAP1 regulates gene networks controlling T-cell development and responsiveness.
Sample Metadata Fields
Specimen part
View Samples- Mus musculus
- 6 Downloadable Samples
- Illumina MouseWG-6 v2.0 expression beadchip
Description
The modulation of chromatin status at specific genomic loci controls lymphoid differentiation. Here, we investigated the role played in this process by KAP1, the universal cofactor of KRAB-containing Zinc Finger Proteins (KRAB-ZFPs), a tetrapod-restricted family of transcriptional repressors. T cell-specific Kap1 knockout mice displayed a significant expansion of immature thymocytes and imbalances in the ratios of mature T cells in the thymus and the spleen, with impaired responses to TCR stimulation. Transcriptome and chromatin studies revealed that KAP1 directly controls the expression of a number of genes involved in TCR and cytokine signalling, among which Traf1 and FoxO1, and is strongly associated with cis-acting regulatory elements marked by the H3K9me3 repressive mark on the genome of thymic T cells. Likely responsible for tethering KAP1 to at least part of its genomic targets, a small number of KRAB/ZFPs are selectively expressed in T lymphoid cells. These results reveal the so far unsuspected yet important role of KRAB/KAP1-mediated epigenetic regulation in T lymphocyte differentiation and activation.
Publication Title
KAP1 regulates gene networks controlling T-cell development and responsiveness.
Sample Metadata Fields
No sample metadata fields
View Samples- Mus musculus
- 35 Downloadable Samples
- Affymetrix Mouse Gene 1.1 ST Array (mogene11st)
Description
This SuperSeries is composed of the SubSeries listed below.
Publication Title
microRNA 193a-5p Regulates Levels of Nucleolar- and Spindle-Associated Protein 1 to Suppress Hepatocarcinogenesis.
Sample Metadata Fields
Specimen part
View Samples