Project description:The transmission of information about the photic environment to the circadian clock involves a complex array of neurotransmitters, receptors, and second messenger systems. Using laser capture microscopy and microarray analysis, a population of genes rapidly induced by light in the suprachiasmatic nucleus is identified. Experiment Overall Design: Mice were exposed starting at 1 hour after lights off to a 30-minute light pulse. At the end of the light pulse, mice were euthanized and the brains extracted. Cells from the suprachiasmatic nucleus were extracted using laser capture microscopy and gene expression was quantified using Affymetrix microarrays. Genes showing a significant increase in expression following the light pulse as compared to a sham light pulse were identified.
Project description:Cell suspension culture of Arabidopsis thaliana (ecotype Columbia) was treated by 250 uM salicylic acid and by two different concentrations of wortmannin (1 uM and 30 uM) for 4 hours. Keywords: dose response,treated vs untreated comparison
Project description:Analysis of gene expression profiling in FABP4 modulation UM-UC14 and Um-UC9 cells. The overall objective was to identify genes regulated by PPARγ signaling pathway in particular FABP4 Total RNA was obtained from FABP4 modulated (either by FABP4 knockdown or rosiglitazone treatment) UM-UC14 or UM-UC9 cells compared to untreated control
Project description:We generated gemcitabine resistant subclones from the human pancreatic cancer cell line BxPC3 using chronic low dose exposure to gemcitabine. Three gemcitabine resistant subclones (BxGR-80C, BxGR-120C and BxGR-360C) were sequenced in addition to BxPC3 cells.
Project description:This study assessed changes in gene expression in 7 mouse brain regions using Illumina Mouse WG-6 (v2) beadchips after exposure to 1.9 GHz pulse-modulated radiofrequency field exposure for 4h/day for 5 days. High dose RF field exposure was whole body average SAR and brain average SAR were 1.45 W/kg and 0.16 W/kg, respectively. Total RNA isolated from the amygdala, auditory cortex, caudate, cerebellum, hippocampus, hypothalamus and medial prefrontal cortex of 1.9 GHz pulse-modulated radiofrequency field exposed mice and compared to that in sham (handled) exposed animals. An unhandled control group was also included in the study design. A total of 20 RNA samples (5 independent biological tissues for each of 4 treatment groups) were collected for each brain region. When analysis of gene expression was conducted within individual brain regions when controlling the false discovery rate (FDR), no differentially expressed genes were identified relative to the sham control. However, it must be noted that most fold changes among groups were observed to be less than 1.5 fold and this study had limited ability to detect such small changes. While some genes were differentially expressed without correction for multiple-comparisons testing, no consistent pattern of response was observed among different RF-exposure levels or among different RF-modulations. The current study provides the most comprehensive analysis of potential gene expression changes in the rodent brain in response to RF field exposure conducted to date. Within the exposure conditions and limitations of this study, no convincing evidence of consistent changes in gene expression was found in response to 1.9 GHz pulse-modulated RF field exposure.
Project description:Gene-expression measurements were made over a 60 minute time course as steady state E. coli cells were subjected to a pulse of glucose.
Project description:To monitor the relative regulatory contributions of RNA production, processing and degradation, we sampled RNA from mouse DCs every 15 minutes, for the first 3 hours of their response to LPS (13 samples in total), following a short (10 minute) metabolic labeling pulse with 4sU preceding the sampled time point. We isolated RNA from each of these samples in two ways. First, to comprehensively measure total RNA regardless of its transcription time, we isolated RNA depleted of rRNA. Second, to measure only newly made RNA, we isolated 4sU-labeled RNA, which could only have been transcribed during the 10 minute labeling pulse and is thus enriched for short-lived transcripts, including mRNA precursors and processing intermediates. We deeply sequenced each isolated RNA population to provide the necessary depth to study exons, introns, and splicing junctions across the transcriptome. We showed our approach general utility by also applying it to lincRNAs and early zebrafish development data Time-course mRNA profiles of mouse DCs that were stimulated with LPS, and labeled with a short (10 minute) 4sU pulse (0-3 hours, 15 min. intervals, 13 time points).
Project description:PURPOSE: This tumor response pharmacodynamic model aims to describe primary lesion shrinkage in non-small cell lung cancer over time and determine if concentration-based exposure metrics for gemcitabine or that of its metabolites,n2',2'-difluorodeoxyuridine or gemcitabine triphosphate, are better than gemcitabine dose for prediction of individual response. EXPERIMENTAL DESIGN: Gemcitabine was given thrice weekly on days 1 and 8 in combination with carboplatin, which was given only on day 1 of every cycle. Gemcitabine amount in the body and area under the concentration-time curves of plasma gemcitabine, 2',2'-difluorodeoxyuridine, and intracellular gemcitabine triphosphate in white cells were compared to determine which best describes tumor shrinkage over time. Tumor growth kinetics were described using a Gompertz-like model.
RESULTS: The apparent half-life for the effect of gemcitabine was 7.67 weeks. The tumor turnover time constant was 21.8 week.cm. Baseline tumor size and gemcitabine amount in the body to attain 50% of tumor shrinkage were estimated to be 6.66 cm and 10,600 mg. There was no evidence of relapse during treatment.