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5 protocols using hdac6 sirna

1

siRNA and Plasmid Transfection Protocols

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For siRNA transfections: 2 × 105 cells were seeded in 60 mm culture dishes 16 hrs before transfection with 500 pmol of siRNA using 7.5 μl of Lipofectamine RNAiMAX (Life Technologies). HDAC6-siRNA and control non-targeting siRNA (Life Technologies) were used at the same concentrations. Silencing efficiency was monitored by western blotting at 48 hrs after transfection. For plasmide transfections: 2 × 105 cells were seeded in 60 mm dishes 16 hrs before transfection with 2.5 μg of plasmid PPP1R2 pcDNA4/TO/myc-His A (Abgent, San Diego, CA, USA) - coding for the physiological PP1 inhibitor i.e. the protein phosphatase inhibitor 2 (I-2) [26 (link)] - using 7.5 μl of Lipofectamine LTX (Life Technologies); 24 hrs after transfection cells were incubated without/with 5 μM drug for additional 24 hrs.
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2

Endothelial Permeability Regulation Assay

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β-actin, ZO-1, caspase-3 antibodies were purchased from Cell Signaling Technology (Danvers, Massachusetts). VE-cadherin antibody was obtained from Santa Cruz Biotechnology (Dallas, Texas). Recombinant Human TNF-α was from R&D Systems (Minneapolis, Minnesota). Tubastatin A, CAY10603 were obtained from Selleck Chemicals (Houston, Teaxs). Lipopolysaccharide (LPS) from Escherichia coli 0111:B4 was purchased from Sigma Aldrich (St. Louis, Missouri). Endothelial growth medium (EBM-2) was obtained from Lonza (Allendale, NJ). In Vitro Vascular Permeability Assay (96-Well) kit was purchased from EMD Millipore (Billerica, Massachusetts). Lipofectamine RNAiMAX reagent, HDAC6 siRNA and control siRNA were obtained from Life technologies (Carlsbad, California).
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3

HDAC6 Silencing in RPMI-8226 and H226 Cells

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For the gene silencing of HDAC6 in RPMI-8226 and H226 cells, HDAC6 siRNA and control siRNA were purchased from Life Technologies (Grand Island, NY, USA) and whose sequences are described as follows: HDAC6 sense, CCAGCACAGUCUUAUGGAUGCUAU and antisense, AUAGCCAUCCAUAAGACUGUGCUGG. siRNAs were diluted to a final concentration of 33 nM in Opti-MEM I (Life Technologies). Transfection was performed with the cells at 40% confluency using Lipofectamine RNAiMAX transfection reagent (Life Technologies) according to the manufacturer’s instructions. Knockdown efficiency was assessed by immunoblotting.
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4

TDP-43 Mutant Protocolome Analysis

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Human TDP-43 was cloned into pCDNA5/TO vector (Invitrogen) and site-directed mutagenesis (Quikchange kit; Stratagene) was used to create K→Q or K→R mutations at residues K145 and K192 as indicated. Creb-binding protein (CBP) plasmids as well as WT-HDAC6 and HDAC6-H803A enzyme-inactive mutant expression plasmids were kindly provided by Dr. Tso-Pang Yao (Duke University). Plasmids were transfected into QBI-293 cells (MP Biomedicals) using Fugene 6 (Roche) per manufacturers instructions. HDAC6 siRNA (Invitrogen) sequence was as follows: AAAGUUGGAACUCUCACGGUGCAGC and was transfected using RNAi Max reagent (Invitrogen) following manufacturer protocols. For oxidative stress treatments, confluent QBI-293 cells grown in 6-well or 10cm dishes were exposed to 50 µM sodium arsenite or 1 mM hydrogen peroxide for 1-12 hr, as indicated in text. Cells were harvested and analyzed by western blotting using the indicated antibodies, as detailed below. Mouse Neuro2A neuroblastoma cells (ATCC) were transfected using Fugene 6 with ΔNLS, ΔNLS-K145Q and ΔNLS-2KQ plasmids and differentiated by 24 hr withdrawal of fetal bovine serum (FBS), which promotes extension of neuritic processes, followed by subsequent western blotting and immunofluorescence studies.
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5

HDAC6 siRNA Transfection and Isoflurane Treatment

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HDAC6 and scramble siRNAs were purchased from Qiagen (Germany). The HDAC6 siRNA sequences were as follows: 5′-CUUCGAAGCGAAAUAUUAATT-3′. siRNA transfection reactions were performed using Lipofectamine RNAi Max (Invitrogen, USA) in accordance with the manufacturers' instructions. Twenty-four hours after transfection, the cells were treated with isoflurane and measured by proliferation assay and Western blot analysis at 24 h post-gas exposure.
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