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18 protocols using x rhod 1 am

1

Fluorescent Probes for Multidrug Resistance

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The fluorescent compounds tetramethylrosamine chloride (TMR-Cl), BODIPY (BD)-verapamil, 3-propionyl ethylenediamine hydrochloride (BD-EDA), BD-prazosin, BD-vinblastine, tetramethylrhodamine ethyl ester perchlorate (TMRE), 3,3'-diethyloxacarbocyanine iodide (DiOC2), quinolinium 6-(dimethylamino)-2-[4-[4-(dimethylamino)phenyl]-1,3-butadienyl]-1-ethyl perchlorate (LDS-751), SYTO13, rhodamine 123, calcein-AM, dihydrorhodamine 123, Mito-tracker deep red FM, ER tracker red, Rhod-2-AM, X-Rhod-1-AM, tetramethylrhodamine methyl ester perchlorate (TMRM), rhodamine B hexyl ester were purchased from Invitrogen/ThermoFisher (Carlsbad, CA). Flutax-1 was purchased from Tocris biosciences (Minneapolis, MN). Cyclosporine A was purchased from the Alexis Corporation (Lausen, Switzerland). NBD-cyclosporine A was generously provided by Drs. Anika Hartz and Björn Bauer, University of Kentucky (Lexington, KY). All remaining chemicals were purchased from Sigma-Aldrich (St. Louis, MO).
The P-gp specific monoclonal antibody C219 was provided by Fujirebio Diagnostic Inc. (Malvern, PA), and the MRK16 antibody was purchased from Kyowa Medex Company (Tokyo, Japan). 4E3 antibody was purchased from Abcam (Cambridge, MA) and UIC2 was purchased from eBioscience (San Diego, CA) [17 (link)]. FITC-labeled anti-mouse secondary antibody IgG2aκ isotype was obtained from BD Biosciences (San Jose, CA).
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2

Fluorescent Probes for P-Glycoprotein Study

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The fluorescent substrates BODIPY (BD)-verapamil, BODIPY-3-propionyl ethylenediamine hydrochloride (BD-EDA), BD-prazosin, and tetramethylrhodamine ethyl ester perchlorate (TMRE) were purchased from Serateh Biotech (Eugene, OR, USA). Other fluorescent compounds including 3-quinolinium 6-(dimethylamino)-2-[4-[4-(dimethylamino)-phenyl]-1,3-butadienyl]- 1-ethyl perchlorate (LDS-751), SYTO13, rhodamine 123 (Rh 123), calcein-acetoxymethyl (Cal-AM), Rhod-2-AM, rhodamine-6G (R6G), X-Rhod-1-AM, and rhodamine B hexyl ester (R6) were purchased from Invitrogen/Thermo Fisher (Carlsbad, CA, USA). Flutax-1 was purchased from Tocris Biosciences (Minneapolis, MN, USA). Cyclosporine A was purchased from the Alexis Corporation (Lausen, Switzerland). [N-ε(4-nitro-benzofurazan-7-yl)-D-Lys(8)]-cyclosporine A (NBD-CsA) was generously provided by Drs Anika Hartz and Bjoern Bauer, University of Kentucky (Lexington, KY, USA). All remaining chemicals were obtained from Sigma-Aldrich (St. Louis, MO, USA). The P-gp-specific monoclonal antibody C219 was provided by Fujirebio Diagnostic Inc. (Malvern, PA, USA), the MRK16 antibody was purchased from Kyowa Medex Company (Tokyo, Japan), and UIC2 antibody was purified from hybridoma cells as described in [28 (link)]. FITC-labeled anti-mouse secondary antibody IgG2a κ isotype was obtained from BD Biosciences (San Jose, CA, USA).
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3

Mitochondrial Morphology and Viability

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Mito Tracker Red CMXRos (C1049B) and Calcein/PI Cell Viability/Cytotoxicity Assay was brought from Beyotime (C2015S). X-rhod-1, AM was purchased from Thermo Fisher (X14210). All these tests were performed according to the kit’s instructions. Morphological analysis of liver mitochondrial by transmission electron microscopy (Servicebio).
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Measuring Mitochondrial Calcium Uptake

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Mitochondrial Ca2+ uptake was monitored in freshly isolated control and DIC-treated cardiomyocytes using X-Rhod-1 AM (ThermoFisher Scientific) [17 (link)]. Cells were loaded with X-Rhod-1 AM for 40 min at 37 °C. Mitochondrial Ca2+ uptake was monitored by the change in fluorescence intensity, normalized to the baseline fluorescence intensity, after the addition of 5 μM Ca2+ and 10 μM Ca2+.
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5

Calcium Imaging of Cells

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Cells were incubated with X-Rhod-1AM (Thermo, X14210) at a 1:4,000 dilution for 10 min, washed twice with PBS and the cells were imaged in widefield at ×10 with the cells in serum-free medium. Using our custom MATLAB tracking software we masked every cell using the H2B:GFP signal and measured the calcium inside this area.
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6

Monitoring Mitochondrial Calcium Uptake

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Mitochondrial Ca2+ Uptake was monitored in freshly isolated control and DIC-treated cardiomyocytes using X-Rhod-1 AM (ThermoFisher Scientific) [17 (link)]. Cells were loaded with X-Rhod-1 AM for 40 minutes at 37°C. Mitochondrial Ca2+ uptake was monitored by the change in fluorescence intensity, normalized to the baseline fluorescence intensity, after the addition of 5 μM Ca2+ and 10 μM Ca2+.
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7

Analyzing Intracellular Ca2+ Transients in hESC/iPSC-derived Cardiomyocytes

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Intracellular Ca2+ transients were analyzed by loading hESC/iPSC-vCMs with 2.5 μmol/L X-Rhod-1 AM (Invitrogen) for 45 minutes at 37°C in DMEM/F12, followed by imaging with a complementary metal-oxide semiconductor–based camera (MiCAM ULTIMA, SciMedia USA Ltd, CA) in Tyrode’s solution containing 140 mmol/L NaCl, 5 mmol/L KCl, 1 mmol/L CaCl2, 1 mmol/L MgCl2, 10 mmol/L glucose, 10 mmol/L HEPES, and pH adjusted to 7.4 with NaOH. Electric stimulation or 50 mmol/L caffeine was applied to evoke Ca2+ transients. Isoproterenol (1 μmol/L) was incubated with hESC/iPSC-vCMs for 3 to 5 minutes at 37°C before measurement; 10 μmol/L ryanodine or 1 μmol/L thapsigargin was incubated with hES2-vCMs, as indicated, for 30 minutes at 37°C before measurements.
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8

Lysosomal and Cytosolic Calcium Imaging

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For lysosomal calcium measurements, we performed Oregon Green® 488 BAPTA-1 dextran (OGBD) labeling41 (link). In this assay, cells with a stable transduction of LAMP1-mRFP lentiviruses were loaded with 0.1 mg ml−1 OGBD (Invitrogen) for 30 min. For cytosolic calcium measurements, we performed X-Rhod-1 and Fura-2 labeling assays. In these assays, cells were loaded with 1 μM X-Rhod-1-AM (Invitrogen) or 1 μM Fura-2-AM (Invitrogen) for 30 min. For OGBD and X-Rhod-1 imaging, the cells were examined under a temperature- and CO2-controlled laser confocal microscope (Olympus); for ratiometric Fura-2 imaging, cells were examined under a temperature- and CO2-controlled fluorescence microscope equipped with excitation wavelengths of 340 and 380 nm (Till Polychrome V, Till Photonics, Gräfelfing, Germany), a 410-dLcp beamsplitter, a D510/80 wide band emission filter (Chroma Technology Corp., Rockingham, VT, USA) and a Quant-EM camera (Photometrics, Tucson, AZ, USA).
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9

Measurement of Cytosolic and Mitochondrial Calcium

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CTRL and Pt primary fibroblasts were cultured onto 24 × 24 mm glass slides in six-well plates and incubated for 30 min at 37 °C, with the following probes: 2 µM Fluo-4 AM (Life Technologies, Carlsbad, CA, USA) for cytosolic Ca2+ and 4 µM X-Rhod-1 AM (Invitrogen, Molecular probesTM, Carlsbad, CA, USA) for mitochondrial Ca2+ level measurements. Stained cells were washed with Phosphate Buffered Saline (PBS), fixed in PBS containing 4% paraformaldehyde for 10 min at room temperature, and cell nuclei were stained with 1 μg/mL 4′,6-Diamidino-2-phenyindole, dilactate (DAPI) Sigma-Aldrich, St. Louis, MO, USA) for 10 min at room temperature. Stained cells were examined with a Leica TCS SP8 microscope (images collected using a 40× and 60× in oil immersion objective) coupled to the Laser Scanning Confocal Microscopy (LSCM) system. Acquisition, storage, and data analysis were performed using Leica software LAS AF 3 (https://www.leica-microsystems.com/products/microscope-software/).
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10

Analysis of T-cell signaling cascades

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Anti-CD3 (clone OKT3), anti-ZAP-70 (clone 1E7.2), mouse IgG1 isotype control, and APC-conjugated anti-mouse IgG1 (clone M1-14D12) were from eBioscience. Rabbit anti-GFP (clone ab290) and goat anti-Rabbit IgG H&L (HRP) (clone ab6721) were from abcam. X-rhod-1-AM, probenecid, Dynabeads, and anti-β tublin antibody were from Invitrogen. Goat anti-mouse IgG peroxidase conjugated, and mouse anti-goat IgG H&L were from Thermo Scientifc. Rabbit anti-phosphoZAP-70 was from Cell Signaling. Mouse anti-phosphotyrosine 4G10 was from Millipore. Superantigen was a mix of recombinant staphylococcal enterotoxin E, staphylococcal enterotoxin A, staphylococcal enterotoxin B, and staphylococcal enterotoxin C3 coming from Toxin Technology. All chemicals and other reagents were from Sigma unless otherwise indicated.
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