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10 protocols using 8 well chambered slides

1

Fluorescent probe cellular uptake

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The A549, OVCAR-4, and HT-1080 cells were seeded into 8-well chambered slides (Lab-Tek, Nunc, USA) and were grown to 70% confluency. Cells were incubated with 1 μM probe (SF8(DRADG)2, SF8(DDGRG)2, or SF8(DRGDG)2) in media for 30 min at 37 °C. The cells were washed three times with phosphate buffered saline and fixed with 4% cold paraformaldehyde for 20 min at room temperature. Cells were then washed one time with phosphate buffered saline, co-stained with 3 μM Hoechst 33342 for 10 min at room temperature, washed two times with phosphate buffered saline, and imaged.
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2

Cell-based Probe Uptake Assay

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The A549, OVCAR-4, and HT-1080 cells were seeded into 8-well chambered slides (Lab-Tek, Nunc, USA) and were grown to 70% confluency. Prior to probe incubation, the cells were placed either in the fridge (4 °C) or a cell incubator (37 °C) for 30 min. The cells were then washed with phosphate buffered saline and incubated at the same temperature as before with 1 μM SF8(DRGDG)2 in media for 30 min. The cells were washed three times with phosphate buffered saline, co-stained with 3 μM Hoechst 33342 for 10 min at room temperature, washed two times with phosphate buffered saline, and imaged.
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3

Visualizing Integrin-Mediated Cell Adhesion

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The A549 cells were seeded into 8-well chambered slides (Lab-Tek, Nunc, USA) and were grown to 70% confluency. Cells were co-incubated with 1 μM Cy3-cRGDfK (Molecular Targeting Technologies Inc.) and 1 μM SF8(DRGDG)2 in media for 30 min at 37 °C. The live cells were then washed three times with phosphate buffered saline, co-stained with 3 μM Hoechst 33342 for 10 min at room temperature, washed two times with phosphate buffered saline, and imaged.
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4

Fluorescent Imaging of Organelle Dynamics

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HT-1080 cells were seeded into 8-well chambered slides (Lab-Tek, Nunc, USA) and were grown to 70% confluency. The cells were incubated with 1 μM SF8 probe in media for 30 min at 37 °C. The cells were washed three times with phosphate buffered saline and co-stained with either 100 nM MitoTracker Green FM (Thermo Fisher Scientific) or 100 nM LysoTracker Red DND-99 (Thermo Fisher Scientific) for 15 min in opti-MEM at 37 °C. Cells were then washed two times with phosphate buffered saline and incubated with 3 μM Hoechst 33342 for 10 min at room temperature. The live cells were washed two additional times and imaged on a Zeiss Axiovert 100 TV epifluorescence microscope equipped with a UV filter (ex: 387/11, em: 447/60), FITC filter (ex: 485/20, em: 524/24), TxRed filter (ex: 562/40, em: 624/40), and Cy5.5 filter (ex: 655/40, em: 716/40). Image processing for each micrograph was then conducted using ImageJ2 software with a 10-pixel rolling ball radius background subtraction.
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5

OVCAR3 Cells RPS6 and PAR Immunostaining

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OVCAR3 cells were seeded on 8-well chambered slides (Thermo Fisher, 154534) one day prior to the experiment. The cells were washed twice with PBS, fixed in 4% paraformaldehyde for 15 minutes at room temperature, and washed three times with PBS. The cells were permeabilized for 5 minutes using Permeabilization Buffer (PBS containing 0.01% Triton X-100), washed three times with PBS, and incubated for 1 hour at room temperature in Blocking Solution (PBS containing 1% BSA, 10% FBS, 0.3M Glycine and 0.1% Tween-20). The fixed cells were incubated with a mixture of RPS6 antibody at a 1:200 dilution and the MAR or PAR detection reagents at a concentration of 20 μg/mL in PBS overnight at 4°C, followed by three washes with PBS. The cells were then incubated with a mixture of Alexa Fluor 594 donkey anti-rabbit IgG (ThermoFisher, A-21207) and Alexa Fluor 488 goat anti-mouse IgG (ThermoFisher, A-11001) each at a 1:500 dilution in PBS for 1 hour at room temperature. After incubation, the cells were washed three times with PBS. Finally, coverslips were placed on cells coated with VectaShield Antifade Mounting Medium with DAPI (Vector Laboratories, H-1200) and images were acquired using an inverted Zeiss LSM 780 confocal microscope.
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6

Osteoclastogenesis Assay with RANKL

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RAW264.7 (3 × 103 cells/well) and BMMs (5 × 103 cells/well) were seeded in 96‐well plates and stimulated with RANKL (50 ng/mL) for 5 days. Cells were subjected to TRAP staining as described.(21) TRAP‐positive multinucleated cells (≥3 nuclei) were scored as OC. For F‐actin staining, BMMs were seeded in 8‐well chambered slides (Thermo Fisher Scientific) at the density of 104 cells per well and stimulated with RANKL for 5 days. BMMs were precultured in α‐MEM containing 30 ng mL M‐CSF and 50 ng mL of RANKL for 3 days, then the cells were regarded as mature OCs (mOCs). To determine F‐actin ring formation of mOCs from Wt or Mpo−/− BMMs, an equal number of mOCs (104 cells/well) were further seeded in 8‐well chambered slides and stimulated with RANKL (50 ng/mL) for another 5 days. Cells were fixed and stained with TRITC‐phalloidin working solution (red) (Yeasen, Shanghai, China) as described previously.(22) Five random fields per sample were counted and averaged for each sample. Each experiment was performed in triplicate and repeated independently more than three times.
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7

Immunofluorescence Staining of Cultured Cells

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Cells were seeded into 8-well chambered slides (Thermo Fisher Scientific). After treatment, cells were fixed with 4% paraformaldehyde at 37 °C for 30 min, permeabilized with 0.2% Triton X-100 and incubated in 3% BSA blocking solution for 30 min to block non-specific bindings of antibody. Cells were then incubated with a primary antibody diluted in 3% BSA in PBS overnight at 4 °C. Then, the cells were washed with PBS for 5 min 3 times and incubated with Alexa Fluor 488- or 594-conjugated-secondary antibodies (Thermo fisher Scientific) for 1 h at room temperature in the dark. Cell nuclei were stained with 1 μg/ml Hoechst33342 for 30 min. The fluorescence images were acquired by Zeiss LSM 880 Confocal system (Carl Zeiss, Thornwood, NY).
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8

Immunofluorescence Assay for iSGECs

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Untreated iSGECs were cultured on 8-well chambered slides (ThermoFisher) coated with gelatin (0.2%) for 24–48 h prior to fixation with 4% PFA. Dilutions for primary and secondary antibodies are listed in Supplementary Table 2. Detailed IF methods are described in Supplementary Methods.
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9

Cellular Uptake of PEGylated MSbNSs/DOX

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The cellular uptake of the PEGylated MSbNSs/DOX was observed using a confocal laser scanning microscope. In brief, panc 02 cells were seeded into 8-well chambered slides (Thermo Scientific, USA) and cultured for 12 h. Then, the cells were incubated with PEGylated MSbNSs/DOX for 3 h, and followed with Lyso-Tracker (green color) and Hoechst 33342 (blue color) double staining. The cells were washed with PBS for three times and analyzed via confocal laser scanning microscope.
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10

Immunocytochemistry of dsRNA in Cells

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For immunocytochemical analysis, the cells were cultured in 8-well chambered slides (Thermo Scientific, #154534) and treated as previously described. After three washes with PBS, cells were fixed with 4% formaldehyde for 20 min at RT. After two washes cells were incubated with a blocking-permeabilization buffer (5% goat serum and 0.3% Triton X-100 in PBS) for 1 h. Then cells were incubated with anti-dsRNA (J2) antibody diluted (2.5 μg/mL) in antibody diluent buffer (1% BSA in PBS) overnight at 4 °C in a humidified chamber. After three 5 min washes with PBS, the cells were incubated with Alexa Fluor 488 conjugated goat anti-mouse IgG H&L antibody (2 μg/mL) (abcam, #ab150113) at RT for 1 h in the dark. After three 5 min washes, the cells were mounted using the ProLong™ Gold Antifade Mountant with DAPI (Invitrogen, #P36935) and coverslips. Slides were imaged using a KEYENCE BZ-X800 fluorescence microscope.
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