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35 protocols using gelred

1

Quantifying α-Synuclein Expression in C. elegans

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Sixty worms of the strain UA196 [sid-1(pk3321); Pdat-1::α-syn, Pdat-1::GFP; Pdat-1::sid-1, Pmyo-2:: mCherry] were grown to day 7 at 20°C. They were harvested from drug treatments or solvent control plates (30 μM MFX/0.1% DMSO; 30 μM CsA/0.1% DMSO; 30 μM SUL/0.1% DMSO; 10 μM CC/ddH2O). Worms were transferred to fresh drug/RNAi plates as needed to avoid starvation. Total RNAs were extracted from control and drug-treated worms as described previously [58 (link)]. Total RNA was quantitated using a Nanodrop and 1 μg of total RNA of each sample was used to synthesize first-strand cDNA using MMLV-RnaseH(-) transcriptase (Promega). Using the cDNA as templates, PCR reactions were conducted with GoTaq polymerase (Promega) at 59°C annealing temperature. Primer sequences are as follows:
PCR products were loaded onto a Gel Red (Sigma) stained 0.8% agarose gel. An image was captured by FujiFilm LAS 4000. Band intensities were compared by digital imaging using MetaMorph software. Fluorescent band intensities were normalized using the following equation: α-syn/ama-1.
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2

Genomic DNA Extraction from Liver Tissue

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For genomic analysis, hepatic tissues of control and TCE-treated mice were kept deeply frozen. DNA was isolated using a QIAamp DNA MiniKit (Qiagen). In brief, up to 25 mg of tissue samples were ground into small pieces and homogenized in DNA lysis buffer and proteinase K (2 mg/mL) and incubated in the same buffer overnight at 56° C. Samples were treated with RNase A (20 mg/mL), purified on spin column and eluted with Tris/EDTA buffer. The extracted DNA was measured by UV spectrophotometry (BioPhotometer, eppendorf), with an absorbance of A260/A280 nm ratios at pH 8.0. To determine the integrity of the extracted DNA, three micrograms of each DNA extract were fractionated by electrophoresis on 1.5 % agarose gel. The gel was stained with GelRed™ (Sigma) and the DNA bands were visualized under UV light source.
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3

Nuclear Protein-DNA Interaction Analysis

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HEK 293T cells were cultured in large quantities, and the lysates underwent subcellular fractionation to obtain a nuclear pellet, which was then dialysed. The pBSK (+) duplex plasmid DNA was linearised with EcoRI and then co-incubated with nuclear extracts, in which genomic DNAs were fragmented into small pieces (<500 bp) by sonication, in reaction buffer at 37 °C for 1 h according to previously described methods22 (link),23 (link) and then subjected to 0.7% agarose gel electrophoresis after deproteinisation (10 μg/μl proteinase K, 3% SDS, 50 mM EDTA and 100 mM Tris-HCL, pH 7.5, 90 min at 57 °C). The gel was then incubated with the highly sensitive nucleic acid dye GelRed (Sigma-Aldrich) at 1:10,000 dilution in water at room temperature for 15 min and then de-stained in water for ~1 h. The Quantification of the DNA bands was performed using a phosphorimager (Analytik Jena AG).
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4

Vancomycin Resistance Gene Detection by PCR

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DNA was extracted from the samples using a standard heat lysis protocol [66 (link)] and two vancomycin resistance-associated genes, vanA and vanB, were detected by PCR using primers that were used in previous studies [62 (link)]. Then, amplicons were analyzed on 1% agarose Tris-Borate-EDTA (TBE) gel containing GelRed® (Sigma, Milan, Italy). Following gel electrophoresis at 150 V for 3 to 5 h, the images were recorded.
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5

LAMP Assay for Parasitemia Detection

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Once the optimization was done, diagnostic specificity and sensitivity were determined with a reaction mixture consisting of 1.6 μM inner primers (FIP and BIP), 0.2 μM outer primers (F3 and B3) and 0.8 μM loop primers (FLP and RLP) at a final concentration of the same reagents described above and the selected target DNA. The diagnostic sensitivity of the technique was determined by performing serial dilutions of the DNA extracted from a blood sample with 2% parasitemia using dilutions in a range of 10−2-10−9. Additionally, the diagnostic specificity of the LAMP technique was performed using DNA from B. bovis, Anaplasma marginale, A. phagocytophilum, A. centrale, Trypanosoma theileri, Bos taurus, Homo sapiens, Rhipicephalus microplus and Neospora caninum. The results were determined visually according to the procedures reported by Goto et al. (13 (link)) using agarose gels stained with GelRed (Sigma-Aldrich, Burlington, MA, United States) and analyzed using a gel documentation equipment (Bio-Rad. Hercules, California, United States).
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6

DNA Amplification and Electrophoresis Protocol

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Warmed up agarose gel of 1.5%, including 55 µL of GelRed (Sigma-Aldrich, Prague, Czech Republic), was poured to the electrophoresis tray. Loading dye of 0.5 µL and 3.5 µL of water were mixed with 1 µL of the sample. Three µL of the ladder and 5 µL of the sample mixtures were loaded to the agarose gel. Electrophoresis was conducted for 60 min in a Tris-borate-EDTA (TBE) buffer. Agarose gel was run at a voltage of 80 V. The gel was analyzed by G: BOX F3-Gel Imaging (Figure S1). Five µL of primer 8FPL was added to each tube with 5 µL of the amplified sample.
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7

Topoisomerase II Cleavage Reaction Assay

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The cleavage reaction assay was performed according to the manufacturer’s instructions with minor modifications. A 20 µL reaction system was prepared containing 2 µL of 0.1 μg/μL pBR322 DNA solution, 2 µL of 5 U/μL Topo II solution, 2 µL of the compound solution and 4 µL of 5× complete buffer and diluted with deionized water. The reaction mixture was incubated for 6 min at 37 °C. After incubation, 2 µL of 1% SDS was added, followed by 2 µL of 250 mM EDTA-2Na (pH 8.0) to capture the lysis intermediates. Proteinase K (0.5 µL of a 20 mg/mL solution) was added, and the reaction was incubated at 45 °C for 30 min to digest Topo II. The resulting mixture was mixed with the 10× loading buffer, added to a 1% gel and electrophoresed in TAE buffer (40 mM Tris-acetate, 2 mM EDTA) for 1.5 h. The gels were stained in 3× GelRed (Sigma-Aldrich) in 0.1 M NaCl solution for 30 min. DNA bands were observed using a UV lamp, and images were captured using a gel imager.
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8

Lentiviral Vector Composition Validation

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To validate the composition of lentiviral expression vectors, pLenti667-Lypla1-mT and pLenti-667-Lypla2-mT were analyzed by restriction digestion. In 25 μL total reaction volume, 400 ng of DNA was digested in the presence of 1x rCutSmart Buffer, 0.5 μL EcoRV-HF (NEB #R3195S), and 0.5 μL BsrGI-HF (NEB #R3575S). Plasmids were digested at 37°C for 60 min, and then enzymes were deactivated at 80°C for 20 min. Loading dye was added, and digested DNA was run in a 0.8% agarose gel with 1:20,000 GelRed (Sigma #SCT123).
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9

Aptamer Stability in Plasma Assay

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To assess the stability of the acquired products, AptW2-1 (0.5 µl of 10 µM) was incubated with 10 µl of plasma at 37°C. By contrast, an equivalent aptamer was also added to 10 μl of PBS as a control. After 0 h, 6 h, 12 h, 24 h, and 48 h of incubation, the samples were collected and incubated at 65°C for 10 min to inhibit nuclease activity. Finally, the samples were run on 3% agarose gel (Sigma-Aldrich, Saint Louis, USA) in 1 × TAE buffer and visualized with GelRed (Sigma-Aldrich). The lanes were quantified and analyzed using Image Lab software.
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10

Venom DNase Activity Assay Protocol

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0.05 µg/µl of crude venom in 1X phosphate buffered saline (PBS) was mixed with purified calf thymus DNA (Sigma-Aldrich, United States) and incubated at 37°C for 60 min to assess the DNase activity of N. sagittifera and N. naja venoms (Gerceker et al., 2009 (link); Senji Laxme R. R. et al., 2021 (link)). Post-incubation, these reaction mixtures were subjected to 0.8% agarose gel electrophoresis. GelRed (Sigma-Aldrich, United States) nucleic acid stain was used to visualise DNA in an iBright CL1000 gel documentation system (Thermo Fisher Scientific, United States). The percentage DNase activity of the venom samples, and that of the positive control, was calculated by densitometric analysis of the images using the ImageJ software (Schneider et al., 2012 (link))
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