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24 protocols using dcfh da

1

Intracellular ATP and ROS Measurement

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The intracellular ATP levels were measured using the ATPlite Luminescence ATP Detection Assay System (Perkin Elmer, Waltham, MA, USA). The ATP levels of the treated cells were normalized to the mean value obtained from untreated cells. Cytosolic and mitochondrial ROS were detected by flow cytometry after loading the cells with 5 μM DCFH-DA [2-(2,7-dichloro-3,6-diacetyloxy-9H-xanthen-9-yl)-benzoic acid] (Cayman Chemical, Ann Arbor, MI, USA) and 2 μM MitoSOX Red mitochondrial superoxide indicator (Thermo Fisher), respectively. Mitochondrial membrane potential was measured by the fluorescent intensity of TMRE (Tetramethylrhodamine, ethyl ester) (Thermos Fisher) using flow cytometry after staining the cells with 50 nM TMRE for 15 min at 37 °C.
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2

Intracellular ROS Measurement in RLECs

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Intracellular ROS level was measured using the fluorescent dye, dichlorofluorescein diacetate (H2-DCF-DA), and a nonpolar compound converted to a polar derivative (dichlorofluorescein) by cellular esterase after incorporation into cells [21 (link)]. RLECs (5 × 103) were cultured in 96-well plates for 120 hrs with DMEM and 5% FBS; 5.5 mM, 55 mM D-glucose, or 55 mM D-mannitol; and 50 μg/mL purified honey or 5 or 50 μg/mL propolis.
The medium was replaced with Hank's solution (Sigma) containing 10 μM DCFH-DA (Cayman Chemical, Ann Arbor, MI) and incubated for 10 min at room temperature. Intracellular fluorescence was detected at an excitation wavelength of 485 nm and an emission wavelength of 530 nm using Spectra Max Gemini EM (Molecular Devices, Sunnyvale, CA).
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3

Measuring Intracellular Redox Levels and Cell Viability

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Intracellular redox levels were measured using the fluorescent dye 2,7-dichlorofluorescein diacetate (DCFH-DA) (Cell Biolabs, San Diego, CA), a nonpolar compound that is converted into a polar derivative (DCFH) by cellular esterases after incorporation into cells. For the UV-B irradiation assays, hLECs were cultured in DMEM supplemented with 2 % FBS in 96-well chamber slides (Nalge Nunc, Rochester, NY) after irradiation with 0.0, 2.0, or 8.0 kJ/m2 UV-B. The medium was replaced with Hank’s solution containing 10 μM DCFH-DA (Cayman Chemical, Ann Arbor, MI) and incubated for 10 min at room temperature. Intracellular fluorescence was detected at an excitation wavelength of 485 nm and an emission wavelength of 530 nm using Spectra Max Gemini EM (Molecular Devices, Sunnyvale, CA).
The MTS assay (Promega, Madison, WI) of cellular proliferation/viability uses 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2 to 4-sulphophenyl) 2H-tetra-zolium salt (MTS). When added to medium containing viable cells, MTS is reduced to a water-soluble formazan salt. The A490-nm value (A = absorbance) was measured after 4 h with a microplate reader (Bio-Rad Laboratories, Hercules, CA). The results were normalized with absorbance of the untreated control(s).
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4

Cellular Oxidative Stress Evaluation

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The cellular ROS levels were evaluated using a 2',7'-dichlorofluorescein diacetate (DCFH-DA) probe. In brief, WI-38 cells at a density of 5x105 cells/ml were treated with 10 µM DCFH-DA (Cayman Chemical Company) for 45 min in the dark at 37˚C. Afterwards, the images were captured under a fluorescence microscope (Olympus Corporation).
In brief, the cell medium was collected and the supernatant was collected after being centrifuged at 2,000 x g for 10 min at 4˚C. The levels of malondialdehyde (MDA), and the activities of superoxide dismutase (SOD) and catalase (CAT) in the supernatants from WI-38 cells were assessed using their corresponding kits from Nanjing Jiancheng Bioengineering Institute (cat. nos. A003-1, A001-3 and A007-1, respectively) according to the manufacturer's protocols.
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5

Intracellular ROS Measurement in Spheroids

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The levels of intracellular ROS were determined by a 2′,7′-dichlorodihydro-fluorescein diacetate assay (DCFH-DA, Cayman). Briefly, spheroids and their adherent cells were exposed to a HA/SF (3 × 106 cells/400 μL) mixture at 37 °C for 16 h. The washed cells were co-treated with 0.1% collagenase and 10 μM DCFH-DA, respectively, at 37 °C for 30 min. Then, the cells were evaluated by flow cytometry using a MACS Quant analyzer (Miltenyi Biotec, Gladbach, Germany).
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6

Quantifying Cellular Free Radicals Using DCFH-DA

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Measurement of the free radical level was carried out using fluorescent indicator 2′,7′-dichlorodihydrofluorescein diacetate (DCFH-DA) (Cayman Chemical Company), as described previously [45 (link)]. DCFH-DA is intracellularly deacetylated to 2′,7′-dichlorodihydrofluorescein (DCFH) and then oxidised to a fluorescent compound, 2′,7′-dichlorofluorescein (DCF). SH-SY5Y and BV2 cells were incubated in DCFH-DA (10 μM) solution in HBSS with 20 mM Hepes (pH 7.4) and 0.02% Pluronic for 50 min at 37 °C in the dark. Then, the cells were washed three times, and the DCF fluorescence was measured using a microplate reader FLUOstar Omega (Ortenberg, Germany) at 485-nm excitation and 538-nm emission wavelengths. After determining the baseline fluorescence of the cells incubated in HBSS, the change in fluorescence after the addition of the test compounds was recorded 3 h after treatment. The results of fluorescence measurements are presented as percent of corresponding control.
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7

Measuring Cellular Reactive Oxygen Species

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Cellular ROS levels were estimated using 2,7-dichlorodihydrofluorescein diacetate (DCFH-DA) purchased from Cayman Chemical (85155, Ann Arbor, MI, USA). The cells were trypsinized and mixed with 1% FBS in PBS containing 10 µM DCFH-DA for 15 min, while protecting it from light. The fluorescent cells were analyzed on a FACSCaliburTM flow cytometer (Becton-Dickinson, San Diego, CA, USA).
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8

Intracellular ROS Quantification

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The levels of intracellular ROS were measured using DCFH-DA (Cayman Chemical, Ann Arbor, MI, USA). The NR8383 cells were incubated with 10 µmol/L DCFH-DA for 30 min at 37 °C. The Image-Pro Plus 6.0 software package (Media Cybernetics, Rockville, MD, USA) was used to quantify the integral optical density (IOD) of ROS fluorescence based on the images acquired by the fluorescence microscope.
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9

Monitoring Intracellular ROS Production

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The production of ROS was monitored by fluorescence microscopy using DCFH-DA (Cayman Chemicals), following the manufacturer’s instructions. This dye is a stable compound that readily diffuses into cells and is hydrolyzed by intracellular esterase to yield DCFH, which is trapped within cells. Hydrogen peroxide or low-molecular-weight hydroperoxides produced by cells oxidize DCFH to the highly fluorescent compound 2′,7′-dichlorofluorescein (DCF). Thus, the intensity of the fluorescence is proportional to the amount of peroxide produced by the cells. For this assay, cells (104) in 96-well plates were loaded with 10 μM DCFH-DA for 30 min at 37°C in the dark, washed twice with PBS, detached with trypsin, and washed in PBS. After centrifugation, the cell pellet was suspended in 200 μl of PBS. The cells were observed under a fluorescence microscope (Leica). At the same time, fluorescence intensity of the cell was measured using a microplate reader (BioTek Synergy) with excitation at 485/20 nm and emission at 528/20 nm.
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10

Intracellular ROS Measurement in hVICs

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The intracellular ROS levels in hVICs were measured by 2,7-Dichlorodihydrofluorescein diacetate (DCFH-DA) assay (Cayman chemical, USA). For DCFH-DA detection, media was removed and DCFH-DA (20 μM, 100 μL) in Hank’s Balanced Salt Solution (HBSS) were added to each well and incubated for 30 min at 37 °C. DCFH-DA was then removed and cells were washed with HBSS. Subsequently, different treatments were given as described below and fluorescence intensity was measured at excitation/emission wavelength of 485/528 nm using a microplate reader (Synergy HT, BioTek instruments, USA). To ensure that the change in the fluorescence intensity was not due to the differences in the cell density or cell death, we adopted uniform cell seeding density and have selected the dose of H2O2 and CNPs that didn’t induce significant cell death.
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