The rat pancreatic cell line AR42J is relatively undifferentiated under normal culture conditions. When the glucocorticoid dexamethasone is added to the medium the cells display a dramatic decrease in proliferative rate and are induced to a more exocrine phenotype that includes increased expression of exocrine pancreas products (digestive enzymes) and more developed regulated secretion. We used microarray to determine changes in gene expression comparing control (without dexamethasone) vs induced (plus dexamethasone).
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Specimen part, Cell line
View SamplesTotal RNA was prepared using TRIzol reagent from the pancreata of eight week old male mice. The genotypes were Control: gastrin+/-, CFTR+/+; and CF: gastrin+/-, CFTR-/-. All mice were on 95% black6, 5% 129Sv background. Mice were fed Peptamen from age 10 days to prevent intestinal obstruction.
Acidic duodenal pH alters gene expression in the cystic fibrosis mouse pancreas.
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View SamplesTotal RNA was prepared from the entire small intestines of 40 day old Control and CFTR null mice (2 males and 1 female of each genotype), congenic on the black6 background, using TRIzol reagent. Mice were fed Peptamen from age 10 days to prevent intestinal obstruction.
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View SamplesBackground: Cystic fibrosis (CF) is caused by mutations in the CFTR gene that impair function of this cAMP-regulated Cl- channel. In the small intestine, loss of CFTR function creates a dehydrated, acidic luminal environment which is believed to cause an accumulation of mucus, a phenotype characteristic of CF. CF mice have an innate immune response and impaired intestinal transit as well. We investigated whether lubiprostone, which activates the CLC2 Cl- channel, would improve the CF intestinal phenotype.
Lubiprostone ameliorates the cystic fibrosis mouse intestinal phenotype.
Specimen part, Treatment
View SamplesWe used microarrays to detail the global program of gene expression changes in wild type and Fbln5-/- adult mice. Estrogen status was controlled
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Sex, Age, Specimen part
View SamplesWnt9b is expressed in the ureteric bud of the kidney at all stages of development. In Wnt9b mutants, the ureteric bud forms but the metanephric mesenchyme is never induced to undergo differentiation.
Myc cooperates with β-catenin to drive gene expression in nephron progenitor cells.
Specimen part
View SamplesWnt9b is expressed in the ureteric bud of the kidney at all stages of development. The Wnt9b cneo allele functions as a partial loss of function. Wnt9bcneo/cneo mutant kidneys initially develop normally but exhaust their nephron progenitor cells by E15.5. Here, we have compared expression between Wnt9bcneo/+ and Wnt9bcneo/cneo kidneys. Additional urogenital tissue (adrenal glands, reproductive tracts and bladder) may have been included in some samples.
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Specimen part
View SamplesAnalysis of gene expression before (P14), during (P28), and after (P60) the critical period for ocular dominance plasticity.
Gene expression patterns in visual cortex during the critical period: synaptic stabilization and reversal by visual deprivation.
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View SamplesAbstract: During Drosophila oogenesis, germline stem cell (GSC) identity is maintained largely by preventing the expression of factors that promote differentiation. This is accomplished via the activity of several genes acting either in the GSC or its niche. The translational repressors, Nanos and Pumilio, act in GSCs to prevent differentiation, likely by inhibiting translation of early differentiation factors, while niche signals prevent differentiation by silencing transcription of the differentiation factor Bam. We have found that the DNA-associated protein Stonewall (Stwl) is also required for GSC maintenance. stwl is required cell-autonomously; clones of stwl- germ cells were lost by differentiation, and ectopic Stwl caused an expansion of GSCs. stwl mutants acted as Suppressors of Variegation, indicating stwl normally acts in chromatin-dependent gene repression. In contrast to several previously described GSC maintenance factors, Stwl likely functions epigenetically to prevent GSC differentiation. Stwl-dependent transcriptional repression does not target bam, but rather Stwl represses the expression of many genes, including those that may be targeted by Nanos/Pumilio translational inhibition.
Stonewalling Drosophila stem cell differentiation by epigenetic controls.
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View SamplesMice were fed with either normal diet (ND), 0.2% cholic acid diet (0.2%CA), DEN treated and fed ND or DEN treated and fed 0.2%CA diet. DEN was treated at 15 microgram/kg body weight at postnatal day 15. Diets were fed for two months starting 8 months of age till 10 months of age. Livers were collected at10 months of age, Total RNA was isolated and used for microarray experiments.
Bile acids promote diethylnitrosamine-induced hepatocellular carcinoma via increased inflammatory signaling.
Age, Specimen part
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