Project description:P. savastanoi pv. phaseolicola isolate R5 was cultured in 10 mL Luria broth with 400 uM genistein or without (but with 50 uL DMSO) at 28 C at 200 rpm on a shaking platform. Replicate R5 cultures of each treatment were centrifuged at 5,000 x g for 10 min., washed once in 1 mL phosphate buffered saline, centrifuged at 5,000 x g for 10 min., resuspended in 1 mL of 1:1:1:1 acetone/acetonitrile/methanol/water and 1,2500 pmol prednisone, and pulverized in the bead mill as before. Two matrix blank samples were prepared the same way starting with 10 mL Luria broth (without R5 and without genistein). The milled extracts were centrifuged for 20 minutes at 12,000 x g. The supernatants were transferred to fresh tubes and centrifuged again. The supernatants were transferred to glass vials and dried under vacuum. The residues were resuspended in 115 uL 50% methanol/0.1% formic acid. Fifteen uL of each sample was pooled to create a quality control (QC) sample. Five uL of the samples were separated on a 150 x 2.1 mm Hypersil GOLD VANQUISH HPLC column with 1.9 um particles (Thermo Fisher Scientific) coupled to a Vanquish HPLC pump (Thermo Fisher Scientific) controlling a 10-minute linear gradient from 0% to 95% acetonitrile and 0.1% formic acid at a flow rate of 0.2 mL per minute. Eluent was electrosprayed at 3.5 kV positive polarity into an Exploris 240 mass spectrometer (Thermo Fisher Scientific) using an internal mass calibrant. Sheath gas was 35, auxiliary gas was 7, and sweep gas was 1 (arbitrary units). The ion transfer tube temperature was 325 C and the vaporizer temperature was 275 C. Advanced peak determination, mild trapping, and internal mass calibration was enabled. Default charge state was 1 and the expected peak width was 6 sec. AcquireX software was used to create a background ion exclusion list from the matrix blank sample and an inclusion ion list from the QC sample. Three subsequent injections of the QC were performed to generate MS2 spectra. After each QC injection, the resolved ions were appended to the exclusion list. Survey scans were recorded in the Orbitrap at 60,000 resolution over a mass range of 70-800 m/z. The RF lens was 70%. Monoisotopic precursor selection was enabled, the minimum intensity was 5,000, and charge states were filtered to 1. Precursors selected within a 1.0 Da isolation window were fragmented by high energy collision-induced dissociation (30%, 50%, 70% normalized stepped collision energy), and fragment ions were resolved in the Orbitrap at 30,000 resolution. Subsequently, all test samples were analyzed alongside QC and matrix blank samples in the following order: Matrix blank 1, QC 1, sample replicate set 1, Blank 2, QC 2, sample replicate set 2, etc. Survey scans were recorded in the Orbitrap at 120,000 resolution over a mass range of 70-800 m/z. The RF lens was 70%. The samples also were analyzed in negative ion mode at -2,500 V but with the same other settings.

Project description:R5 was cultured in 10 mL Luria broth with 1.0 mM resveratrol or without (but with 50 uL DMSO) at 28 C at 200 rpm on a shaking platform until the cultures reached an average O.D. of 1.0 at 600 nm. Five replicate cultures were used for metabolomics experimentation. The samples were centrifuged at 5,000 x g for 10 min., washed once in 1 mL phosphate buffered saline, centrifuged at 5,000 x g for 10 min., resuspended in 1 mL of 1:1:1:1 acetone/acetonitrile/methanol/water and 1,2500 pmol prednisone, and pulverized in the bead mill. Two matrix blank samples were prepared the same way starting with 10 mL Luria broth (without R5 and without resveratrol). The milled extracts were centrifuged for 20 minutes at 12,000 x g. The supernatants were transferred to fresh tubes and centrifuged again. The supernatants were transferred to glass vials and dried under vacuum. The residues were resuspended in 115 ul 50% methanol/0.1% formic acid. Fifteen ul of each sample was pooled to create a QC sample. Five ul of the samples were separated on a 150 x 2.1 mm Hypersil GOLD VANQUISH HPLC column with 1.9 um particles (Thermo Fisher Scientific) coupled to a Vanquish HPLC pump (Thermo Fisher Scientific) controlling a 10-minute linear gradient from 0% to 95% acetonitrile and 0.1% formic acid at a flow rate of 0.2 mL per minute. Eluent was electrosprayed at 3.5 kV positive polarity into an Exploris 240 mass spectrometer (Thermo Fisher Scientific) using an internal mass calibrant. Sheath gas was 35, auxiliary gas was 7, and sweep gas was 1 (arbitrary units). The ion transfer tube temperature was 325 C and the vaporizer temperature was 275 C. Advanced peak determination, mild trapping, and internal mass calibration was enabled. Default charge state was 1 and the expected peak width was 6 sec. AcquireX software was used to create a background ion exclusion list from the matrix blank sample and an inclusion ion list from the QC sample. Four subsequent injections of the QC were performed to generate MS2 spectra. After each QC injection, the resolved ions were appended to the exclusion list. Survey scans were recorded in the Orbitrap at 60,000 resolution over a mass range of 70-800 m/z. The RF lens was 70%. Monoisotopic precursor selection was enabled, the minimum intensity was 5,000, and charge states were filtered to 1. Precursors selected within a 1.0 Da isolation window were fragmented by high energy collision-induced dissociation (30%, 50%, 70% normalized stepped collision energy), and fragment ions were resolved in the Orbitrap at 30,000 resolution. Subsequently, all test samples were analyzed alongside QC and matrix blank samples in the following order: Matrix blank1, QC1, sample replicates 1, Blank2, QC2, sample replicates 2, etc. Survey scans were recorded in the Orbitrap at 120,000 resolution over a mass range of 70-800 m/z. The RF lens was 70%.

Project description:Formalin-fixed, paraffin-embedded (FFPE) tissues have many advantages for identification of risk biomarkers, including wide availability and potential for extended follow-up endpoints. However, RNA derived from archival FFPE samples has limited quality. Here we identified parameters that determine which FFPE samples have the potential for successful RNA extraction, library preparation, and generation of usable RNAseq data. We optimized library preparation protocols designed for use with FFPE samples using seven FFPE and Fresh Frozen replicate pairs, and tested optimized protocols using a study set of 130 FFPE biopsies from women with benign breast disease. Metrics from RNA extraction and preparation procedures were collected and compared with bioinformatics sequencing summary statistics. Finally, a decision tree model was built to learn the relationship between pre-sequencing lab metrics and qc pass/fail status as determined by bioinformatics metrics.. Samples that failed bioinformatics qc tended to have low median sample-wise correlation within the cohort (Spearman correlation < 0.75), low number of reads mapped to gene regions (< 25 million), or low number of detectable genes (11,400 # of detected genes with TPM > 4). The median RNA concentration and pre-capture library Qubit values for qc failed samples were 18.9 ng/ul and 2.08 ng/ul respectively, which were significantly lower than those of qc pass samples (40.8 ng/ul and 5.82 ng/ul). We built a decision tree model based on input RNA concentration, input library qubit values, and achieved an F score of 0.848 in predicting QC status (pass/fail) of FFPE samples. We provide a bioinformatics quality control recommendation for FFPE samples from breast tissue by evaluating bioinformatic and sample metrics. Our results suggest a minimum concentration of 25 ng/ul FFPE-extracted RNA for library preparation and 1.7 ng/ul pre-capture library output to achieve adequate RNA-seq data for downstream bioinformatics analysis.

Project description:Female Sprague-Dawley rats were randomly separated into two groups: i) trained (Ex group) and ii) sedentary (Cont group). Animals from the Ex group were adapted to treadmill exercise for two consecutive weeks, involving a gradual increase in the running time till 60 min/day at 20 m/min, 0% grade, 5 days/week. This exercise program remained constant until the end of the 54 weeks. Mitochondria isolation from 10 animals (5 Ex group and 5 Cont group) was performed using the conventional methods of differential centrifugation. Mitochondrial protein extracts were reduced with dithiothreitol, alkylated with iodoacetamide and digested with trypsin using the FASP procedure (18). Briefly, each sample was solubilized in 4 % SDS, 0.1 M DTT, 0.1 M HEPES and incubated for 30 min at 60 C. Then, samples were mixed with 0.2 mL of a solution of 8 M Urea, 0.1 M HEPES, pH 8.5 (UH solution), loaded into the filtration devices (3k Microcon, Millipore), centrifuged at 14,000 g for 20 min, and washed twice with UH solution. After centrifugation, the concentrates were alkylated with 50 mM iodoacetamide in UH solution (dark, 25 C, 20 min), and washed twice with UH solution. The concentrate was diluted with 0.1 mL of 50 mM ammonium bicarbonate (ABC) and digested overnight (37 C) with the addition of 2 ug of trypsin diluted in 30 uL of 50 mM ABC. The resulting tryptic peptides were collected by centrifugation and the filter were washed twice with 50 uL of 50 mM ABC. Eluted peptides were acidified with 10 uL of formic acid and cleaned up on a homemade Empore C18 column (3M, St. Paul, MN, USA) (ref) for subsequent phospho-enrichment and/or analysis by LC-MS/MS. The dried protein digest was dissolved with 10 uL (3 % ACN, 0.1 % TFA), diluted 1:5 with loading buffer (1 M glycolic acid, 5 % TFA, 80 % ACN) and phosphopeptides were enriched on TiO2-beads as previously described (19). Briefly 5 mg of "Titansphere TiO2 5 um" were suspended in 100 uL of 100 % ACN, immobilized in a pipette-column and washed using 5 uL of loading buffer. Each sample was loaded in each pipette-column and then washed with 30 uL of washing buffer (1 % TFA, 80 % ACN). Phosphopeptides were eluted from the beads with 25 uL of 25 % ACN (v/v) containing 25 % NH4OH (m/v), acidified with 10 uL of 10 % TFA and vacuum- concentrated to approximately 4 uL. Samples were finally diluted to 10 uL with H2O + 0.1% formic acid prior to injection. The peptides mixtures were analyzed by online nanoflow liquid chromatography tandem mass spectrometry (nanoLC-MS/MS) on an EASY-nLC system (Proxeon Biosystems, Odense, Denmark) connected to the LTQ Orbitrap Velos instrument (Thermo Fisher Scientific, Bremen, Germany) through a nanoelectrospray ion source. Six microliters of the peptide mixture were auto-sampled directly onto the analytical HPLC column (120 mm x75 um I.D., 3 um particle size (Nikkyo Technos Co., Ltd.) with a 120-min gradient from 5 % to 50 % ACN in 0.1 % FA. The effluent from the HPLC column was directly electrosprayed into the mass spectrometer. The LTQ Orbitrap Velos instrument was operated in data-dependent acquisition mode to automatically switch between full scan MS and MS/MS acquisition. The MS survey scan was performed in the FT cell recording a window between 350 and 2000 m/z. The resolution was set to 60 000, and the automatic gain control was set to 1,000,000 ions with a maximal acquisition time of 400 ms. The 20 most intense peptide ions with charge states great than or equal to 2 were sequentially isolated to a target value of 5,000 and fragmented in the high-pressure linear ion trap by low-energy CID with normalized collision energy of 35% Q value of 0.25, and an activation time of 10 ms. Raw files were processed using Proteome Discoverer version 1.3 (Thermo Fisher Scientific, Bremen). Peak lists were searched using Mascot software version 2.3 (Matrix Science, UK) against a SwissProt database containing entries corresponding to Rattus norvegicus (version of July 2012), a list of common contaminants, and all the corresponding decoy entries. Trypsin was chosen as enzyme and a maximum of two miscleavages were allowed. Carbamidomethylation (C) was set as a fixed modification, whereas oxidation (M) and phosphorylation (STY) were used as variable modifications. Searches were performed using a peptide tolerance of 7 ppm, a product ion tolerance of 0.5 Da. Resulting data files were filtered for FDR less than 1 % at peptide level.

Project description:A control group consisting of nine C57/BL/6J mice was maintained on a normal diet consisting of Purina Rodent Chow (Harlan Teklad, catalog #5008, 6.5% fat, 49% carbohydrate, 23% protein, 3.5 kcal/ g). The experimental group consisted of nine mice grown on a specialty high-fat diet (Harlan Teklad, catalog #TD88137, 42.16% fat, 42.81% carbohydrate, 15.02% protein, 4.53 kcal/ g). Mice were maintained for ten weeks on their respective diets in a controlled environment with standard light and feeding schedule. Two days before tissue harvest, the experimental group on the high-fat diet was divided into one group of five and one group of four mice. The first group continued on the high-fat diet for the final two days, while the second group fasted. Mouse weights were recorded two days prior, and the day of tissue harvest. At the end of the fasting period liver tissue samples were harvested from each mouse. RNA was purified from the liver tissue samples. Each tissue was homogenized in 1 mL of STAT-60 (Tel-Test, Inc., Friendswood, TX) and the homogenate was mixed with 200 uL of chloroform. The aqueous phase was removed, and mixed with 500 uL of isopropanol to precipitate the RNA. The resulting RNA pellet was washed with 500 uL of 70% ethanol and allowed to air dry. The pellet was dissolved in RNase free water (Ambion, TX), quantified by UV spectroscopy, and stored at -80C. Total RNA control samples (Universal Mouse Reference RNA, catalog # 740100, Stratagene) were labeled using Cy3 dCTP (Perkin-Elmer), and liver total RNA experimental samples were labeled using Cy5 dCTP (Perkin-Elmer) during reverse transcription. For reverse transcription 10 ug of total RNA was mixed with 2 uL of 10X Cy-labeled dCTP, 2 uL of 100 mM DTT (Invitrogen), 4 uL of 5X First Strand Buffer (Invitrogen), 2 uL of a dNTP mixture containing 5 mM dGTP, dATP, dTTP and 2 mM dCTP (Invitrogen), 2 uL of 0.5 mg/ mL oligo-dT18-20 (Invitrogen), and 2 uL of Superscript II reverse transcriptase (Invitrogen). The control RNA samples were additionally mixed with 2 uL of random hexamers. The reaction mixtures were incubated at 42 C for two hours. After the reverse transcription reactions, the RNA templates were degraded by addition of 2 uL of 1 N NaOH and incubation at 65 C for 10 minutes. The alkaline conditions were neutralized by addition of 2 uL of 1 N HCl. Liver cDNA samples were then mixed with a control cDNA sample, and the mixtures were cleaned using a QIAquick Nucleotide Removal kit (Qiagen) as described by the manufacturer's instructions. The cleaned samples were concentrated in a speed vacufuge (Eppendorf) for 20 minutes at 65 C, and were dissolved in 32 uL of prewarmed hybridization buffer (Clontech Laboratories), quantified, and hybridized to prepared oligonucleotide microarrays. Hybridization occurred overnight at 55 C using Corning hybridization chambers. The following day the arrays were washed in Glass Hybridization Wash Solution (Clontech Laboratories), then in 1X SSC, and finally in 0.1X SSC. The arrays were dried by centrifugation and scanned using a GenePix 4000B scanner (Axon Instruments). The resulting data was downloaded and formatted in Excel (Microsoft), and analyzed using Matlab (The MathWorks, Inc.). Microarrays were prepared using GAPS glass slides (Corning), and a Virtek arrayer (Bio-Rad). Arrays contained 16,847 features, printed from a synthesized oligonucleotide mouse library (Operon). The library was suspended in 3X SSC, centrifuged, and loaded into the arrayer. Arrays were printed at approximately 50% humidity. Once printed, the probes were crosslinked using a UV Stratalinker (Stratagene). The slides were then blocked for 15 minutes in a 250 mL mixture containing 15.7 g/ L succinic anhydride (Fluka AG), 239 mL 1-methyl-2-pyrrolidinone (EM Science), and 10.7 mL of 1 M boric acid (Fisher), pH 8.0. They were cleaned by rinsing twice in 250 mL of milli-Q water, followed by 250 mL of 95% ethanol (Pharmco Products). After blocking, they were dried using filtered air and stored in the dark at room temperature. In this experiment the gene expression data of the control mice is given by samples GSM6592, GSM6593, GSM6594, and GSM6595. The gene expression data of the high-fat mice is given by samples GSM6599, GSM6600, GSM6601, and GSM6602. The gene expression data of the fasted mice is given by samples GSM6596, GSM6597, and GSM6598. Keywords = mouse, liver, energy homeostasis, gene expression, microarrays Keywords: repeat sample

Project description:A mouse hepatoma cell line (Hepa1-6 cells, ATCC) was grown in T-25 tissue culture flasks (Corning) at 37ºC in 5% CO2 under two conditions. The first condition was the control, which contained DMEM medium (Gibco BRL) with 25 mM glucose, 4 mM glutamine, 1% penicillin-streptomycin (Sigma), and 10% CPSR-3 (Sigma). The second condition was identical to the first, however the glutamine concentration was altered periodically. Once the cells had grown to confluency, the experiment began at 9:30 PM by exchanging the medium in all flasks. The control flasks received the same medium, containing 4 mM glutamine, while the experimental flasks received identical medium with no glutamine. Twenty-four hours later, the medium was exchanged again, however this time all flasks received medium containing 4 mM glutamine. The first medium exchange was repeated at 48 hours into the experiment, while the second was repeated at 72 hours into the experiment. Hence the glutamine concentration of the experimental flasks oscillated between 0 mM and 4 mM glutamine over 96 hours, while the glutamine concentration of the control flasks remained constant at 4 mM glutamine. At regular intervals, the flasks were sampled. Total RNA was isolated, medium samples were retained, and isotopic measurements were performed from flasks fed different labelled compounds. All samples taken during the experiment were analyzed. The total RNA harvested was labeled and hybridized to DNA microarrays to measure the abundance of transcripts present. Total RNA control samples were labeled using Cy3 dCTP (Perkin-Elmer), and total RNA experimental samples were labeled using Cy5 dCTP (Perkin-Elmer) during reverse transcription. For reverse transcription 10 ug of total RNA was aliquoted into a 6 uL volume. If concentration of the RNA was necessary, this was conducted using a speed vacufuge (Eppendorf) at 60ºC for 10 minutes. The RNA sample was then mixed with 2 uL of 10X Cy-labeled dCTP, 2 uL of 100 mM DTT (Invitrogen), 4 uL of 5X First Strand Buffer (Invitrogen), 2 uL of a dNTP mixture containing 5 mM dGTP, dATP, dTTP and 2 mM dCTP (Invitrogen), 2 uL of 0.5 mg/ mL oligo-dT18-20 (Invitrogen), and 2 uL of Superscript II reverse transcriptase (Invitrogen). This reaction mixture was incubated at 42ºC for approximately two hours. Following the reverse transcription reaction, the RNA template was degraded by addition of 2 uL of 1 N NaOH and incubation at 65 ºC for 10 minutes. The alkaline conditions were then neutralized by addition of 2 uL of 1 N HCl. Samples from identical time points that were to be compared on DNA microarrays were then mixed. The combined sample was cleaned to remove extra primers and nucleotides using a QIAquick Nucleotide Removal kit as described by the manufacturer's instructions. Once cleaned, the sample was concentrated using a speed vacufuge (Eppendorf) for 20 minutes at 65ºC. Following concentration, the sample was resuspended in 32 uL of prewarmed hybridization buffer (Clontech Laboratories), 1 uL was removed for quantitation, and hybridized to prepared oligonucleotide microarrays. Hybridization occurred overnight at 55 ºC using Corning hybridization chambers. The following day the arrays were washed in Glass Hybridization Wash Solution (Clontech Laboratories), and then in 1X SSC, and finally 0.1X SSC. Each wash step was conducted for 20 minutes under high agitation. The arrays were dried by centrifugation and scanned using GenePix 4000B scanner (Axon Instruments). The resulting data was downloaded and formatted in Excel (Microsoft), and then analyzed using Matlab (The MathWorks, Inc.). The arrays used for hybridization were prepared using GAPS glass slides (Corning), and a Virtek arrayer (Bio-Rad). These arrays contained 17,280 features, printed from a synthesized oligonucleotide mouse library (Operon). Briefly, the library was resuspended in 3X SSC, centrifuged, and loaded into the arrayer. Arrays were printed using 32 pins (Telechem), at approximately 50% humidity. Once printed, the probes were crosslinked to the glass slides using a UV Stratalinker (Stratagene). The slides were then blocked for 15 minutes in a 250 mL mixture containing 15.7 g/ L succinic anhydride, 239 mL 1-methyl-2-pyrrolidinone, and 10.7 mL of 1 M boric acid, pH 8.0. They were cleaned by rinsing in 250 mL of milli-Q water (X2), followed by 250 mL of 95% ethanol. They were finally dried using filtered air and stored in the dark at room temperature. Keywords = mouse, liver, hepatoma, cell culture, glutamine, carbon metabolism Keywords: time-course

Dataset Information

Pseudomonas savastanoi pv phaseolicola R5 treated with resveratrol (metabolomics)

Dataset's files

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets