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GSE48195
Mus musculus
6 Downloadable Samples
Affymetrix Mouse Genome 430 2.0 Array (mouse4302)
Description
Transcriptional and posttranscriptional regulatory networks play a crucial role in the maintenance and adaptation of pancreatic beta-cell function. In this study we show that the levels of the prototypic neuroendocrine miRNA-7 are regulated in islets of obese, diabetic and aged mouse models. Using gain- and loss-of-function models we demonstrate that miR-7 regulates crucial members of the endocrine pancreatic transcriptional network controlling differentiation and insulin synthesis. Importantly, it also directly regulates key proteins in the insulin granule secretory machinery. These results reveal an interconnecting miR-7 genomic circuit that influences beta-cell differentiation, insulin synthesis and release and define a role for miR-7 as an endocrine checkpoint to stabilize beta-cell function during metabolic stress. These findings have implications for miR-7 inhibitors as potential therapies for type 2 diabetes and neurodegenerative diseases.
Publication Title
MicroRNA-7a regulates pancreatic β cell function.
Sample Metadata Fields
Specimen part, Cell line, Treatment
View Samples- Caenorhabditis elegans
- 3 Downloadable Samples
- Affymetrix C. elegans Genome Array (celegans)
Description
Bio-electrospray, the direct jet-based cell handling apporach, is able to handle a wide range of cells. Studies at the genomic, genetic, and the physiological level have shown that, post-treatment, cellular integrity is unperturbed and a high percentage (>70%, compared to control) of cells remain viable. Although, these results are impressive, it may be argued that cell based systems are oversimplistic. This study utilizing a well characterised multicellular model organism, the non-parasitic nematode Caenorhabditis elegans. Nematodes were subjected to bio-electrosprays to demonstrate that bio-electrosprays can be safely applied to nematodes.
Publication Title
Bio-electrospraying the nematode Caenorhabditis elegans: studying whole-genome transcriptional responses and key life cycle parameters.
Sample Metadata Fields
Specimen part
View Samples- Caenorhabditis elegans
- 12 Downloadable Samples
Affymetrix C. elegans Gene 1.0 ST Array (elegene10st)
Description
This SuperSeries is composed of the SubSeries listed below.
Publication Title
Toxicogenomics of iron oxide nanoparticles in the nematode C. elegans.
Sample Metadata Fields
Specimen part
View Samples- Caenorhabditis elegans
- 6 Downloadable Samples
- Affymetrix C. elegans Gene 1.0 ST Array (elegene10st)
Description
Superparamagnetic Iron Oxide Nanoparticles (SPIONs) are currently being investigated for a range of biomedical applications. Their use have been related with different cytotoxic mechanisms including the generation of oxidative stress and the induction of metal detoxification pathways, among others. We have investigated the molecular mechanisms responsive to in-house fabricated citrate coated SPIONs (C-SPIONs) in the nematode C. elegans to compare in vivo findings with previous in vitro studies. C-SPIONs (500 g/ml) affected the transcriptional response of signal transduction cascades (i.e. TFG-beta), protein processing in the endoplasmic reticulum, and RNA transport, among other biological processes. They also triggered a lysosomal response, indicating a relevant biological role of this cellular compartment in the response to this nanoparticle treatment in C. elegans. Interestingly, other pathways frequently linked to nanotoxicity like oxidative stress or apoptosis were not identified as significantly affected in this genome-wide in vivo study despite the high dose of exposure.
Publication Title
Toxicogenomics of iron oxide nanoparticles in the nematode C. elegans.
Sample Metadata Fields
Specimen part
View Samples- Caenorhabditis elegans
- 6 Downloadable Samples
- Affymetrix C. elegans Gene 1.0 ST Array (elegene10st)
Description
Superparamagnetic Iron Oxide Nanoparticles (SPIONs) are currently being investigated for a range of biomedical applications. Their use have been related with different cytotoxic mechanisms including the generation of oxidative stress and the induction of metal detoxification pathways, among others. Different NP coatings are being explored, among them albumin which has been applied in some drugs delivery systems. We have investigated the molecular mechanisms responsive to in-house fabricated SPIONs coated with bovine serum albumin (BSA-SPIONs) in the nematode C. elegans to compare in vivo findings with previous in vitro studies. BSA-SPIONs (500 g/ml) affected the transcriptional response of glycan metabolic pathways related to innate immune response, xenobiotics degradation, and triggered a lysosomal response, indicating a relevant biological role of this cellular compartment in the response to this nanoparticle treatment in C. elegans. Remarkably, key biological functions such as apoptosis or protein processing were not affected with significance despite the high dose of exposure.
Publication Title
Toxicogenomics of iron oxide nanoparticles in the nematode C. elegans.
Sample Metadata Fields
Specimen part
View Samples- Homo sapiens
- 26 Downloadable Samples
- Affymetrix Human Genome U133A Array (hgu133a)
Description
Biopsies from uninvolved and from lesional skin of 13 patients with plaque-type psoriasis. Based on paired samples, 179 genes were more than 2-fold differentially expressed in lesional skin.
Publication Title
Increased expression of Wnt5a in psoriatic plaques.
Sample Metadata Fields
Sex, Age
View Samples- Caenorhabditis elegans
- 24 Downloadable Samples
- Affymetrix C. elegans Genome Array (celegans)
Description
Recent research has highlighted that the polyphenols Quercetin (Q) and Tannic acid (TA) are capable of extending the lifespan of C. elegans. To gain a deep understanding of the underlying molecular genetics, we analyzed the global transcriptional patterns of nematodes exposed to Quercetin or Tannic acid concentrations that are non-effective (in lifespan extension), lifespan extending or toxic.
Publication Title
Meta-Analysis of Global Transcriptomics Suggests that Conserved Genetic Pathways are Responsible for Quercetin and Tannic Acid Mediated Longevity in C. elegans.
Sample Metadata Fields
Specimen part, Treatment
View Samples- Caenorhabditis elegans
- 27 Downloadable Samples
- Affymetrix C. elegans Genome Array (celegans)
Description
Low concentrations of the dissolved leonardite humic acid HuminFeed (HF) prolonged the lifespan and enhanced the thermal stress resistance of the model organism Caenorhabditis elegans. Furthermore growth was impaired and reproduction delayed, effects which have also been identified in other polyphenolic monomers, including tannic acid, rosmarinic acid, and caffeic acid. Moreover, a chemical modification of HF (HF-HQ), which increases its phenolic/quinonoid moieties, magnified the biological impact on C. elegans. To gain a deep insight into the molecular basis of these effects, we performed global transcriptomics on young adult (3 d) and old adult (11 d) nematodes exposed to two concentrations of HF and young adults (3 d) exposed to two concentrations of HF-HQ.
Publication Title
The Nematode Caenorhabditis elegans, Stress and Aging: Identifying the Complex Interplay of Genetic Pathways Following the Treatment with Humic Substances.
Sample Metadata Fields
Specimen part, Treatment
View Samples- Caenorhabditis elegans
- 2 Downloadable Samples
- Affymetrix C. elegans Genome Array (celegans)
Description
Oligomeric proanthocyanidins (OPCs) reduce triglycerides in the nematode C. elegans. Lipase was strongly inhibited in vitro accompanied by the reduction of total triglyceride storage capacity in vivo; Lipophilic staining was also attenuated in wild type worms and high-fat mutants exposed to OPCs. Apart from biochemical analyses, lipid metabolism was also genetically regulated, emphasizing the necessity to study underlying regulation mechanisms in intact animals. To gain a deeper insight into the potential gene targets of purified oligomeric proanthocyanidin trimer gallate (pOPC7), a binary microarray assay was carried out with wild type N2 populations continuously exposed to a bacterial diet with or without pOPC7.
Publication Title
Proanthocyanidin trimer gallate modulates lipid deposition and fatty acid desaturation in <i>Caenorhabditis elegans</i>.
Sample Metadata Fields
Sex, Treatment
View Samples- Homo sapiens
- 52 Downloadable Samples
- Illumina HumanHT-12 V4.0 expression beadchip
Description
This SuperSeries is composed of the SubSeries listed below.
Publication Title
ACSL1 Is Associated With Fetal Programming of Insulin Sensitivity and Cellular Lipid Content.
Sample Metadata Fields
Sex
View Samples