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5 protocols using cytosine d arabinofuranoside ara c

1

Culturing Hippocampal Neurons from Transgenic Mice

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Cultured hippocampal neurons were prepared as described (Yang et al., 2009 (link)) with some modifications. Briefly, we dissected hippocampus from App-/--Gad67+/GFP and WT-Gad67+/GFP littermates of P0/1 pups, trypsinized the tissue at 37°C for 30 min, and then gently triturated in culture medium containing 10% heat-inactivated fetal bovine serum using fire-polished pipettes, before centrifuging at 1000 rpm for 10 min. Cells were resuspended in Neurobasal Medium supplemented with B27 and L-glutamine (Invitrogen, Carlsbad, CA), and plated at 1–2 × 104 cells/ml onto 13 mm poly-L-lysine coated coverslips. One day after plating, 4 M cytosine-D-arabinofuranoside (Ara-C) (Sigma) was added to prevent astrocyte proliferation. Cultures of 12–14 DIV were used for patch clamp recordings.
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2

Dissociation and Maintenance of Rat Hippocampal and Cortical Neurons

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Primary cultures of dissociated hippocampal or cortical cells were prepared and maintained as previously described [45 (link)]. Briefly, hippocampi and neocortices from pooled postnatal day 0 (P0) or P1 male and female rat pups were dissociated and plated onto tissue culture plastic or on glass coverslips precoated with poly-L-lysine (Sigma), at different densities depending on the endpoint to be analyzed (detailed information provided in the respective method section). Cells were maintained in Neurobasal A media supplemented with B27 and 2 mM Glutamax (all from Life Technologies), except for cultures used in the proteomics experiments, for which cells were maintained in Neural Q supplemented with GS21 (both from Sigma). Cytosine-D-arabinofuranoside (araC; 5 μM, Sigma) was added to the medium on day in vitro (DIV) 4 to prevent overgrowth of astrocytes. Half the medium was replaced with fresh media (without araC) twice weekly.
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3

Visualization of Cardiomyocyte DNA Synthesis

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BrdU (30 μM, Sigma) was added to the medium of cardiomyocytes to examine DNA synthesis. To inhibit DNA polymerization, cytosine-D-arabinofuranoside (araC) (10 μM, Sigma) was added to the dishes. Mitosis was determined by visualization of nuclei stained positive for an antibody to phosphorylated histone H3 (H3P). An antibody against aurora B kinase (Sigma-Aldrich, Cat.# A5102) was used to visualize cytokinesis. Signals were visualized with secondary antibodies conjugated to donkey anti-rabbit (FITC, Jackson Immunoresearch). BrdU was stained with a 5-Bromo-2′-deoxy-uridine Labeling and Detection Kit I (Roche Applied Science) and nuclei were visualized with 4′,6′-diamidino-2-phenylindole (DAPI, Invitrogen). Fluorescence imaging was performed with an Olympus BX41 (Olympus America Inc., Melville, NY, U.S.A.) equipped with epiflouresence microscopy, and images were recorded using a digital camera with MagnaFire 2.1 software.
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Culturing Embryonic Rat Superior Cervical Ganglia

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Superior cervical ganglia (SCGs) were isolated from embryonic day 17 Sprague-Dawley rat embryos (Hilltop Labs). Primary neurons were cultured in tri-chamber dishes as previously described [48 ,49 (link)]. Multi-well or 35-mm plastic tissue culture dishes (Falcon) or optical plastic dishes (Ibidi) were coated with 500 μg/ml of poly-DL-ornithine (Sigma Aldrich) and 10 μg/ml of natural mouse laminin (Invitrogen). After coating, two sets of grooves were etched on the dishes. A silicone grease-coated tri-chamber (Tyler Research) was placed on top of a drop of 1% methylcellulose (in neuronal medium) covering the groves. Ganglia were trypsinized and triturated, and approximately 2/3 of an SCG was plated in the S compartment. Neurons were maintained in complete neuronal medium: Neurobasal medium (Gibco) supplemented with 100 ng/ml nerve growth factor 2.5S (Invitrogen), 2% B27 (Gibco) and 1% penicillin and streptomycin with 2 mM glutamine (Invitrogen). 2 to 3 days after seeding, 1 mM cytosine-D-arabinofuranoside (AraC; Sigma-Aldrich) was added for at least 2 days to eliminate non-neuronal cells. Neurons were cultured for 14–21 days prior to experiments.
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5

Culturing Rat Embryonic SCG Neurons

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SCG neurons from rat embryos (embryonic day 17 [E17]) were cultured in trichambers as previously described.69 Briefly, SCGs were dissociated with trypsin (2.5 mg/mL, Sigma-Aldrich, The Woodlands, TX, USA) and plated on poly-O-ornithine and laminin-coated dishes with media containing neurobasal media supplemented with 2% B-27, 100 ng/mL nerve growth factor (NGF), and 1% penicillin-streptomycin-glutamine (Thermo Fisher Scientific, Rockford, IL, USA). Approximately two-thirds of a single ganglion was placed for the S (soma) compartment of the trichamber. Three days after seeding, culture medium was treated with 0.1 mM cytosine-d-arabinofuranoside (Ara C) (Sigma-Aldrich, The Woodlands, TX, USA) for at least 2 days to eliminate dividing, nonneuronal cells. Culture media were replaced every 5 days, and neurons were incubated at 37°C with 5% CO2.
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