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8 protocols using sigenome non targeting sirna 3

1

Characterization of Cell Models

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WI38 cells were purchased from American Type Culture Collection. Cells were cultured in DMEM supplemented with 10% FBS (R&D Systems) and 1% Penicillin-Streptomycin (ThermoFisher Scientific). These cells were screened for mycoplasma every four months using the ATCC Universal Mycoplasma Detection Kit (Catalogue # 30–121 1012 K). Early passage primary MEFs were harvested and cultured from C57BL/6 mice as previously described [20 (link), 44 (link), 45 (link)]. β-gal staining was achieved using the Cellular Senescence Kit (Millipore). Recombinant proteins included Cyclophilin A (R&D) and S100A4 (Abcam). SN52 peptide (AAVALLPAVLLALLAPVQRKRRKALP) and SN52-mut peptide (AAVALLPAVLLALLAPVQRNGRKALP) were acquired form GenScript. Inhibitors used were: WP1066, BMS345541, G06976, Staurosporine, and KU60019 (all from Selleck), and Roscovitine (Sigma). The following siRNAs were used: siGENOME non-targeting siRNA#3 (Dharmacon) and si-STAT3 (sc-29,493, Santa Cruz). siRNA transfection was performed with Oligofectamine (Invitrogen).
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2

GATA2-AS1 siRNA Knockdown in HUVECs

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HUVECs were grown to 90% confluency on 60-mm (2 (link)) gelatin-coated tissue culture plates and transfected with siRNA at a final concentration of 40 nM using Oligofectamine (Invitrogen) in a total volume of 2000 μl. Transfection occurred for 4 h at 37 °C in Opti-MEM medium (Invitrogen), after which M199 medium (Invitrogen) containing fetal bovine serum (Hyclone), heparin, and endothelial cell growth supplement (Biomedical Technologies) was added. Cells were incubated with siRNA for 24 to 48 h depending on the downstream application. Custom Stealth siRNAs (Invitrogen) were used to knockdown GATA2-AS1. SiGENOME Non-Targeting siRNA #3 (Dharmacon) was used as control siRNA transfection (Table S3).
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3

Cell Line Characterization and Manipulation

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U87, A172, and HEK293T (293T) cells were purchased from American Type Culture Collection. HeLa cells stably expressing empty vector (EV), 6His-SUMO 1 and 6His-SUMO 2, were obtained from Dr. RT Hay and have been described previously [37 (link)]. Cells were cultured in DMEM supplemented with 10% FBS and 1% penicillin-streptomycin (ThermoFisher Scientific). GBM34 and GBM44 GSCs obtained from Dr. Mariano Viapiano (Brigham and Women’s Hospital, Boston, MA) were maintained as neurospheres as described [27 ]. All cell lines were screened for mycoplasma using the ATCC Universal Mycoplasma Detection Kit (catalogue # 30- 121 1012K) every 4 months. Early passage primary MEFs from wild-type, MyD88−/−, Rig-I−/−, Mda5−/−, Lgp2−/−, MAVS−/−, Tmem173−/−, and Trif−/− mice were cultured as previously described [51 (link), 52 (link)]. All cell lines were authenticated by routine morphological and growth analysis and by western blotting. TMZ was obtained from Sigma-Aldrich. DNA transfection was performed using TransIT LT1 (Mirus) and siRNA transfection with Oligofectamine (Invitrogen). Cycloheximide (CHX) and MG132 were from Cayman Chemical. The following siRNAs were used: siGENOME non-targeting siRNA#3 (Dharmacon), siGENOME Smartpool si-LGP2 (Dharmacon), si-TLR3 (sc-36685, Santa Cruz), and si-PKR (sc-36263, Santa Cruz).
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4

Construction of UTR Luciferase Reporters

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To generate the c-Jun and BTG1 5′ UTR luciferase reporter plasmids, sections of the 5′ UTR were first amplified from human cDNA. These were then stitched together downstream of a T7 promoter using overlap-extension PCR and Gibson cloning. For the PSMB6 5′ UTR luciferase reporter plasmid, the 5′ UTR was constructed by annealing primers together to create restriction site-compatible overhangs. The 5′ UTRs were then inserted together with Renilla luciferase into pUC19 for c-Jun and pcDNA4 for BTG1 and PSMB6. The eIF3 binding mutants and BTG1 stem loop chimeras were made by inserting annealed primers after cutting the plasmid with enzymes flanking the desired insertion site. The BTG1 overexpression plasmid was constructed by inserting the BTG1 open reading frame, isolated by PCR from human cDNA, into pcDNA4 modified with a Kozak site30 (link). siRNA pools used were siGENOME Jun (Dharmacon M-003268-03) and siGENOME Non-Targeting siRNA #3 (Dharmacon D-001210-03).
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5

Quantifying ARHGDIB Protein Levels in Esophageal Cells

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Lysates from each of the esophageal cell types growing under basal conditions were resolved by SDS-PAGE (20 μg protein per lane, 12% SDS gel) as previously described (37 (link)). Western blots were probed with primary antibodies directed against ARHGDIB (ab88317, Abcam, Cambridge, UK, 1/500 overnight at 4 °C) or β-Actin (AC-15, Sigma, Dorset, UK, 1/5000, 2 h at RT) followed by secondary incubation with rabbit anti-mouse or goat anti-rabbit antibodies conjugated to either the IRDye™ 680RD or IRDye™ 800CW ((Li-Cor Biosciences, Lincoln, NE, 1/2000, 2 h at RT protected from light). Blots were imaged using the Odyssey SA system (Li-Cor Biosciences) as per manufacturer's recommendations.
For siRNA experiments, OE33 cells were transfected with vector, nontargeting scrambled sequence siRNA (siGENOME, Non-Targeting siRNA#3, Dharmacon, Lafayette, CO) or siRNA to ARHGDIB (siGENOME, SMARTPool, Dharmacon) as previously described (37 (link)). Cells were harvested 72 h after transfection and lysates resolved by Western blotting as previously.
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6

Construction of UTR Luciferase Reporters

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To generate the c-Jun and BTG1 5′ UTR luciferase reporter plasmids, sections of the 5′ UTR were first amplified from human cDNA. These were then stitched together downstream of a T7 promoter using overlap-extension PCR and Gibson cloning. For the PSMB6 5′ UTR luciferase reporter plasmid, the 5′ UTR was constructed by annealing primers together to create restriction site-compatible overhangs. The 5′ UTRs were then inserted together with Renilla luciferase into pUC19 for c-Jun and pcDNA4 for BTG1 and PSMB6. The eIF3 binding mutants and BTG1 stem loop chimeras were made by inserting annealed primers after cutting the plasmid with enzymes flanking the desired insertion site. The BTG1 overexpression plasmid was constructed by inserting the BTG1 open reading frame, isolated by PCR from human cDNA, into pcDNA4 modified with a Kozak site30 (link). siRNA pools used were siGENOME Jun (Dharmacon M-003268-03) and siGENOME Non-Targeting siRNA #3 (Dharmacon D-001210-03).
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7

Silencing TPMT Expression in UB/OC-1 Cells

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Tpmt expression was silenced in UB/OC-1 cells using 50 nM siGENOME mouse Tpmt SMARTpool siRNA or siGENOME Non-Targeting siRNA #3 (Dharmacon). siRNA transfections were performed using Dharmafect 1 transfection reagent (Dharmacon) for 24 hours according to the manufacturer’s specifications. Tpmt expression was monitored by SYBR Green qPCR conducted in a 10 μl reaction consisting of 5 μl PowerSybr Green Master Mix, 2 μl of cDNA, and 300 nM primers using cycling conditions: 95°C—7 min and 40 cycles of 95°C—5 sec, 60°C—30 sec. Under these conditions Tpmt expression was decreased by 55% in UB/OC-1 cells (S1 Fig).
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8

Targeted siRNA Silencing of eRNAs in HEK293 Cells

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Each siRNA treatment included a final concentration of 40nM siRNA on both uninfected and SeV treated HEK293 cells. We used siGENOME Non-Targeting siRNA #3 (Dharmacon, Lafayette, CO, catalog # D-001210–03–05) as a negative control. We used a pool of two custom-synthesized ds-siRNAs for each eRNA, with each siRNA at equal concentration. RNA extraction and oligodT-primed cDNA synthesis was performed as previously described (38 (link)). Please see Supplementary Table S1 for siRNA sequences.
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