Neuronal differentiation of PC12 cells in response to NGF is a prototypical model in which signal duration determines a biological response. Sustained ERK activity induced by NGF, as compared to transient activity induced by EGF, is critical to the differentiation of these cells. To characterize the transcriptional program activated preferentially by NGF, we compared global gene expression profiles between cells treated with NGF and EGF for 2-4 hrs, when sustained ERK signaling in response to NGF is most distinct from the transient signal elicited by EGF. This analysis identified 69 genes that were preferentially upregulated in response to NGF.
Global expression analysis identified a preferentially nerve growth factor-induced transcriptional program regulated by sustained mitogen-activated protein kinase/extracellular signal-regulated kinase (ERK) and AP-1 protein activation during PC12 cell differentiation.
Specimen part, Cell line, Time
View SamplesObjective: To quantify changes in adipogenic gene expression in the presence of ritonavir (RTV) or tenofovir (TDF), and determine whether conjugated linoleic acid (CLA) isomers (cis9,trans11 or trans10,cis12) can mitigate detrimental effects of antiretoviral drugs.
Microarray Analysis Reveals Altered Lipid and Glucose Metabolism Genes in Differentiated, Ritonavir-Treated 3T3-L1 Adipocytes.
Specimen part, Cell line, Treatment
View SamplesThe goal of this study was to identify potential AMH-induced genes and regulatory networks controlling regression by RNA-Seq transcriptome analysis of differences in Müllerian Duct mesenchyme between males (AMH signaling on) and females (AMH signaling off) in purified fetal Müllerian Duct mesenchymal cells. This analysis found 82 genes up-regulated in males during MD regression and identified Osterix (Osx)/Sp7, a key transcriptional regulator of osteoblast differentiation and bone formation, as a novel downstream effector of AMH signaling during MD regression. Overall design: Müllerian Duct mesenchymal cells mRNA profiles from 2-7 embryonic day 14.5 embryos were generated by deep sequencing, in triplicate, using Illumina HiSeq 2000.
<i>Osterix</i> functions downstream of anti-Müllerian hormone signaling to regulate Müllerian duct regression.
Sex, Specimen part, Cell line, Subject
View SamplesThis study compared gene expression in murine bcr-abl positive acute lymphoblastic leukemia cells in vivo in allogeneic BMT recipients compared to syngneneic BMT recipients.
Differential gene expression in acute lymphoblastic leukemia cells surviving allogeneic transplant.
Specimen part
View SamplesWe use mice containing a gene trap in the first intron of the Rest gene, which effectively eliminates transcription from all coding exons, to prematurely remove REST from neural progenitors. We find catastrophic DNA damage that occurs during S-phase of the cell cycle and concominant with activation of p53 pro-apoptotic sgnalling, with consequences including abnormal chromosome separation, apoptosis, and smaller brains.
The REST remodeling complex protects genomic integrity during embryonic neurogenesis.
Specimen part
View SamplesWe use mice containing a gene trap in the first intron of the Rest gene, which effectively eliminates transcription from all coding exons, to prematurely remove REST from neural progenitors. We find catastrophic DNA damage that occurs during S-phase of the cell cycle, with consequences including abnormal chromosome separation, apoptosis, and smaller brains. Further support for persistent effects is the latent appearance of proneural glioblastomas in adult mice also lacking the tumor suppressor, p53. A Rest deficient mouse line generated previously, using a conventional gene targeting approach, does not exhibit these phenotypes, likely due to a remaining C terminal peptide that still binds chromatin and recruits REST chromatin modifiers.Our results indicate that REST-mediated chromatin remodeling is required for proper S-phase dynamics, prior to its well-established role in relieving repression of neuronal genes at terminal differentiation.
The REST remodeling complex protects genomic integrity during embryonic neurogenesis.
Specimen part
View SamplesThere is growing evidence that transplantation of cadaveric human islets is an effective therapy for type 1 diabetes. However, gauging the suitability of islet samples for clinical use remains a challenge. We hypothesized that islet quality is reflected in the expression of specific genes. Therefore, gene expression in 59 human islet preparations was analyzed and correlated with diabetes reversal after transplantation in diabetic mice. Analysis yielded 262 differentially expressed probesets, which together predict islet quality with 83% accuracy. Pathway analysis revealed that failing islet preparations activated inflammatory pathways, while functional islets showed increased regeneration pathway gene expression. Gene expression associated with apoptosis and oxygen consumption showed little overlap with each other or with the 262 probeset classifier, indicating that the three tests are measuring different aspects of islet cell biology. A subset of 36 probesets surpassed the predictive accuracy of the entire set for reversal of diabetes, and was further reduced by logistic regression to sets of 14 and 5 without losing accuracy. These genes were further validated with an independent cohort of 16 samples. We believe this limited number of gene classifiers in combination with other tests may provide complementary verification of islet quality prior to their clinical use.
Gene expression signature predicts human islet integrity and transplant functionality in diabetic mice.
Specimen part
View SamplesWe report differences in mRNA gene expression in rectal biopsies from MSM compared to controls and for MSM timed with episodes of CRAI. Overall design: Rectal biopsies were obtained from MSM at two study timepoints: 1. after who abstaining from CRAI for >72 hours and 2.after engaing in CRAI within the last 24 hours. Rectal biopsies were also obtained from men who never engaged in AI.
Short Communication: Anatomic Site of Sampling and the Rectal Mucosal Microbiota in HIV Negative Men Who Have Sex with Men Engaging in Condomless Receptive Anal Intercourse.
Specimen part, Subject
View SamplesThe effect of CLA on gene expression in Caco-2 cells
Conjugated linoleic acid alters global gene expression in human intestinal-like Caco-2 cells in an isomer-specific manner.
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View SamplesAnalysis of adult retinas from tripartite motif-containing domain 9 knockouts and wild type littermates. Trim9 belongs to the TRIM family of E3 ubiquitin ligases. Results provide insight into possible roles for Trim9 in the retina.
The Trim family of genes and the retina: Expression and functional characterization.
Specimen part
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