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4 protocols using 35 mm confocal dish

1

Visualizing siRNA and Peptide Nanocomplex Internalization

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The cellular internalization of the siRNA/peptide nanocomplex was investigated using confocal imaging. HeLa cells of 2.0 × 104 were incubated in a 35-mm confocal dish (SPL Life Sciences Co., Ltd., Pocheon, South Korea) for 24 h. After a 30-min incubation of the final 50 nM Cy3-labeled siRNA and fluorescein (FITC)-labeled S-R15 (20:1 N/P ratio), the
nanocomplex was applied to the cells for 4 h. The nucleus and actin were stained using 5 µg/mL Hoechst 33342 and 100 nM SiR-actin kit, respectively. The intracellular localization and co-localization of siRNA and S-R15 were confirmed using fluorescence and a confocal microscope (Ti2; Nikon, Tokyo, Japan). Both of them were analyzed at the single-molecule level using super-resolution radial fluctuation (SRRF). Bright-field and fluorescence images were acquired at 900× magnification. ImageJ software was used to merge the fluorescence images of Cy3, FITC, and SiR-actin [37 (link)].
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2

Lysosome Calcium Measurement with GCaMP3-ML1

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Lysosome calcium measurement was performed using methods described previously [10 (link)]. Briefly, 2 × 105 HT1080 cells stably expressing GCaMP3-ML1 were cultured in a 35-mm confocal dish (SPL Life Sciences, 100350). Changes in cytosolic Ca2+ levels were monitored by following changes in GCaMP3-ML1 fluorescence for 15 min upon addition of 200 μM GPN in Ca2+-free external solution containing 145 mM NaCl, 5 mM KCl, 3 mM MgCl2, 10 mM glucose, 1 mM EGTA (Sigma-Aldrich, E3889), 20 mM HEPES (Gibco, 15630080), pH 7.4, using the real-time mode of epifluorescence microscopy (Applied Precision DeltaVision Elite, Applied Precision Inc., USA). Data Inspection Program provided by the DeltaVision software was used to measure the intensity of GCaMP3-ML1 fluorescence, and the mean fluorescence intensity was monitored at 488 nm. The acquired epifluorescence images were numerically deconvolved using DeltaVision algorithms (Applied Precision Inc., USA).
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3

Immunofluorescence Assay for PEDV Infection

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Vero cells were maintained in α-MEM media supplemented with 5% heat-inactivated FBS and 1% antibiotic-antimycotic agent, and cultivated on coverslips placed in 35 mm confocal dish (SPL, Korea) for the immunofluorescence assay. After cells reached confluence, PEDV SM98 strain was inoculated onto the cell monolayer at multiplicity of infection (MOI) of 1 and incubated for 1 h at 37 °C. Subsequently, serum-free α-MEM media containing trypsin (2.5 μg/ml) was added and the culture was incubated for 3 days at 37 °C. Then, cells were fixed with 4% paraformaldehyde for 10 min at room temperature. Cells were subsequently blocked with 1% bovine serum albumin in PBS for 1 h at room temperature and then incubated with mouse anti-S25-229 immune sera for 1 h at room temperature. Then, cells were incubated with biotinylated goat anti-mouse IgG antibody at a dilution of 1: 200 (Vector, USA) followed by streptavidin-Alexa Fluor 488 (Invitrogen, USA) at a dilution of 1: 500. Finally, cells were counterstained with Hoechst 33342 dye (Invitrogen, USA) for 1 min, and cell staining was visualized using a confocal laser scanning microscopy LSM710 (Carl Zeiss, USA).
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4

Photodynamic Therapy of U87MG Cells

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To visualize the frequency of live cells after treatment with KUP-1 (0.4 mg mL−1) and O2@ KUP-1 (0.4 mg mL−1) under irradiation at 530 nm (60 mW cm-2) for 3 min, U87MG cells (2 × 104) were plated on a 35-mm confocal dish (SPL, Korea). When the cells were plated on the dish, they were treated with KUP-1 and O2@ KUP-1 in SF media. After incubation for 12 h, the cells were rinsed twice with 1 × PBS and irradiated with SF media at 530 nm. The cells on SF media were irradiated at 530 nm (60 mW cm−2) for 3 min, and the cells were incubated for 30 h at 37 °C with 5% CO2. The frequency of live cells was determined according to the manufacturer’s protocol (Cat #R37601, Thermo Fisher, USA).
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