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5 protocols using hanks balanced salt solution (hbss)

1

ROS Measurement in Cultured Cells

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ROS levels were evaluated using a ROS Assay Kit (R252; Dojindo, Kumamoto, Japan). The cells were plated in an 8-well 0.8 cm2 Lab-Tek chamber slide (177445PK; Thermo Fisher Scientific). After 24 h, the cells were washed with phenol red-free Hanks’ balanced salt solution (HBSS, 084-08965; Wako) and incubated in DCFH-DA solution and 0.5 μg/mL Hoechst 33342 (H342; Dojindo, Tokyo, Japan) for 30 min at 37 °C with 5% CO2. Thereafter, the cells were washed with HBSS and treated with H2O2 and IL/TNF for 30 min. After washing with HBSS, the fluorescence signal was detected using a fluorescence microscope (BZ-X700, KEYENCE).
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2

Intracellular Fe2+ and Lipid Radicals Imaging

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Detection of intracellular Fe2+ was performed using FerroOrange (excitation: 561 nm, emission: 570–620 nm) (Dojindo). Cells were cultured in glass-bottomed dishes for 3 d and washed with HBSS (Thermo Fisher Scientific), after which 1 μM FerroOrange was added for 30 min at 37°C, followed by observation under a microscope (BZ-X800; Keyence). Lipid radicals were detected by LipiRADICAL Green (Funakoshi) (excitation: 470 nm, emission: 520–600 nm). Cells were cultured in glass-bottomed dishes for 3 d and washed with HBSS, after which 1 μM LipiRADICAL Green was added for 10 min at 37°C, followed by observation under a microscope (BZ-X800; Keyence).
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3

Intracellular ROS Visualization in Cell Lines

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Intracellular OH were detected using HPF (hydroxyphenyl fluorescein; Goryo Chemical Inc., Sapporo, Japan) and mtROS were detected using MitoSOXTM (Thermo Fisher Scientific) as recommended by the manufacturer. Briefly, HeLa and SAS CRR cells were cultured overnight in glass bottom dishes (Matsunami Glass Ind., Ltd., Osaka, Japan). Then, the cells were washed twice using Hank’s balanced salt solution (HBSS) (Fujifilm Wako) to remove residual FBS. For OH, cells were treated with 10 µM of HPF in HBSS for 15 min at 37 °C. For mtROS, cells were treated with 5 µM of MitoSOXTM in HBSS for 10 min at 37 °C. After these treatments, cells were washed with HBSS three times and fluorescence images were obtained using a BZ-8000 fluorescence microscope (KEYENCE Corporation, Osaka, Japan) from 3 separate dishes for each treatment.
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4

Intracellular Iron and Lipid Radical Detection

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Detection of intracellular Fe2+ was performed using FerroOrange (excitation, 561 nm; emission, 570–620 nm) (DOJINDO, Kumamoto, Japan). Cells were cultured in glass-bottomed dishes for 3 days and washed with HBSS (Thermo Fisher), after which 1 µM FerroOrange was added for 30 min at 37°C, followed by observation under a microscope (BZ-X800; KEYENCE). To detect Fe2+ in mitochondria, 5 µM Mito-FerroGreen working solution (excitation, 488 nm; emission, 500–550 nm) (DOJINDO, Kumamoto, Japan) was added to the cells for 30 min at 37°C, followed by observation under a microscope. Lipid radicals were detected using LipiRADICAL Green (Funakoshi, Tokyo, Japan) (excitation, 470 nm; emission, 520–600 nm) and Liperfluo (excitation, 524 nm; emission, 535 nm) (DOJINDO, Kumamoto, Japan). Cells and cardiomyocyte were cultured in glass-bottomed dishes for 3 days and washed with HBSS, after which 1 µM LipiRADICAL Green or 4 µM Liperfluo working solution was added for 10 min at 37°C, followed by observation under a microscope (BZ-X800; KEYENCE).
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5

Neutrophil Chemotaxis Assay

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Human neutrophils were isolated from peripheral whole blood collected from healthy volunteers using a Ficoll-Histopaque density gradient. Red blood cells were lysed with hypotonic buffer and isolated neutrophils were resuspended in Hank’s Balanced Salt Solution (HBSS, Gibco life technologies™). Neutrophils (3 × 106 cells/mL) were placed on Ibidi chemotaxis chambers following manufacturer’s protocol and as described earlier [27 (link)] (μ-Slide Chemotaxis 80326, Ibidi cells in focus, Germany). Chemotaxis toward gradient of LTB4, RvD1, RvD2, RvD3, RvD4, RvD5, 17-oxo-RvD4, 10-trans-RvD4, or 10,13-trans-RvD4 (10 nM each) or vehicle (HBSS containing 0.1% ethanol) was then recorded for a 30-minute period with a digital monochrome/color switching camera using BZ-II Viewer software (Keyence). Cell migration was analyzed using the cell-tracking function in ImageJ software. At least 60 cells per condition were analyzed from each donor for four separate donors.
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