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9 protocols using p24g 1.5 13 f

1

Cell culture protocol for X1(FS) and SiRNeoblasts

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Dishes and multi-well plates were pre-coated with poly-D-lysine (50 μg/mL, BD Biosciences). If not specified, 1 X 104 X1(FS) cells or SiRNeoblasts were cultured in 50 μL indicated culture medium containing 5% Fetal Bovine Serum (Sigma-Aldrich, F4135) per well in 384-well plates (Greiner bio-one, 781090) at 22°C with 5% CO2 or ambient atmosphere.
For time-lapse imaging experiments, 6 X 105 X1(FS) cells were pre-loaded in the center of a PDL-coated MatTek dish with 100 μL medium for 30 min and then added in either 5 mL of the indicated culture medium per well of 6 cm dishes (MatTek, P35G-1.5-14-C) or 1 mL of the indicated culture medium per well of 24-well plates (MatTek, P24G-1.5-13-F).
For transfection experiments, if not specified, 2 × 105 bulk cells, sorted live cells, or SiRNeoblasts were cultured in 96-well plates with 225 μL medium (with or without supplements) per well. Supplements containing 100 X MEM Vitamin Solution (Gibco, 11120-052), 100 X MEM Non-Essential Amino Acid (Gibco, 11140-050), 100 mM Sodium Pyruvate (Gibco, 11360-070), and Penicillin Streptomycin (Gibco, 15140-122) were added to the basal medium at the 1:100 dilution.
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2

Dynamic Biosensor Imaging in HEK293T Cells

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HEK293T cells were transfected with Tornado plasmids encoding either the circular SAM biosensor with transducer 1 or circular Broccoli. Two days later, these cells were subcultured onto coated glass bottom plates (MatTek Corporation P24G-1.5–13-F) and imaged the next day. Using live cell conditions described above, we imaged cells before and for 3 h after adding cycloleucine (Sigma Aldrich A48105) to 100 mM at 5 min intervals. Then, we withdrew cycloleucine and continued to image cells every 5 min for 3 additional h. ImageJ59 (link) was used for processing images and for measure the total cell fluorescence at each time point.
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3

Quantifying Transfected Cell Growth

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HEK293T cells were independently transfected with plasmids encoding Broccoli using Tornado or encoding mCherry with FuGENE HD (Promega 2311). 2 d after transfection, cells were subcultured 1:4 and 1:8 onto glass-bottom plates (MatTek Corporation P24G-1.5–13-F). The next day, fluorescent cells in each 1:4 subculture were counted in 4 fields, as well as the number of Hoechst-stained cells Hoechst. After 2 d, the 1:8 subcultures were imaged in the same way. We calculated the number of non-fluorescent cells in each culture and then quantified doubling times of fluorescent and non-fluorescent cells according to the formula for exponential growth.
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4

Live-cell Imaging of Amino Acid Response

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Cells were seeded on glass-bottom plates (P24G-1.5-13-F; Mattek) and treated in fresh culture media the next day. For amino acid-free conditions, cells were washed with PBS twice prior to treatment. Imaging was performed in live-cell incubation chambers maintained at 37°C and 5% CO2. Images were acquired every 5 to 30 min for 24-48 hours using a Nikon Ti-E inverted microscope attached to a CoolSNAP charge-coupled device camera (Photometrics) and NIS Elements AR software (Nikon, 3.22.15). For experiments with ML162, time-lapse imaging was performed on plastic tissue culture plates (3527; Corning) on a Zeiss microscope using ZEN software (Zeiss). Images were quantified manually in NIS Elements AR (Nikon) or ZEN (Zeiss) and processed using ImageJ (2.0.0) and Adobe Photoshop (CS6 13.0.5).
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5

Mouse Cortical Cell Culture Protocol

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The E14.5 mouse cortices were dissected out and dissociated by trituration in Hanks’ balanced salt solution (HBSS) (Mediatech). Cells were re-suspended in culture medium DMEM with 4.5 g/l Glucose (Mediatech), glutamine (Gibco), penicillin/streptomycin (Gibco), sodium pyruvate (Gibco), 1 mM N-acetyl-l-cysteine (Sigma), B27 (Invitrogen), N2 (Invitrogen), and 10 ng/ml basic fibroblast growth factor-2 (bFGF2; Gibco), and were plated down into poly-d-lysine (P6407, Sigma)-coated 24-well glass-bottom plate (P24G-1.5-13-F, MatTek) at 2 × 105 cell per well. After 20 h of culture, cells were processed for antibody staining. The experiment was repeated twice.
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6

Live-Cell Imaging of Transfected Cells

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Transfected cells were seeded on FN1-coated 35-mm glass dishes (P35G-1.5-14-C, MatTek Corporation) for TIRF and epifluorescence experiments, or on FN1-coated 24 multi-well glass plate (P24G-1.5-13-F; MatTek Corporation) for phase-contrast experiments. 24 h after transfection, live-cell imaging was performed in serum-free Leibovitz’s L-15 medium supplemented with 1% D-glucose, 1% antibiotic-antimycotic, and 1% sodium pyruvate (TIRF and epifluorescence) or in serum-free DMEM supplemented with 1% antibiotic-antimycotic and 1% sodium pyruvate (phase contrast).
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7

Dynamic Biosensor Imaging in HEK293T Cells

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HEK293T cells were transfected with Tornado plasmids encoding either the circular SAM biosensor with transducer 1 or circular Broccoli. Two days later, these cells were subcultured onto coated glass bottom plates (MatTek Corporation P24G-1.5–13-F) and imaged the next day. Using live cell conditions described above, we imaged cells before and for 3 h after adding cycloleucine (Sigma Aldrich A48105) to 100 mM at 5 min intervals. Then, we withdrew cycloleucine and continued to image cells every 5 min for 3 additional h. ImageJ59 (link) was used for processing images and for measure the total cell fluorescence at each time point.
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8

Quantifying Transfected Cell Growth

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HEK293T cells were independently transfected with plasmids encoding Broccoli using Tornado or encoding mCherry with FuGENE HD (Promega 2311). 2 d after transfection, cells were subcultured 1:4 and 1:8 onto glass-bottom plates (MatTek Corporation P24G-1.5–13-F). The next day, fluorescent cells in each 1:4 subculture were counted in 4 fields, as well as the number of Hoechst-stained cells Hoechst. After 2 d, the 1:8 subcultures were imaged in the same way. We calculated the number of non-fluorescent cells in each culture and then quantified doubling times of fluorescent and non-fluorescent cells according to the formula for exponential growth.
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9

Live-cell Imaging of Amino Acid Response

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Cells were seeded on glass-bottom plates (P24G-1.5-13-F; Mattek) and treated in fresh culture media the next day. For amino acid-free conditions, cells were washed with PBS twice prior to treatment. Imaging was performed in live-cell incubation chambers maintained at 37°C and 5% CO2. Images were acquired every 5 to 30 min for 24-48 hours using a Nikon Ti-E inverted microscope attached to a CoolSNAP charge-coupled device camera (Photometrics) and NIS Elements AR software (Nikon, 3.22.15). For experiments with ML162, time-lapse imaging was performed on plastic tissue culture plates (3527; Corning) on a Zeiss microscope using ZEN software (Zeiss). Images were quantified manually in NIS Elements AR (Nikon) or ZEN (Zeiss) and processed using ImageJ (2.0.0) and Adobe Photoshop (CS6 13.0.5).
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