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4 protocols using vectasheild mounting medium with dapi

1

Cell Viability and DNA Fragmentation

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Cell viability was determined by using the CellTiter-Glo luminescent cell viability assay (Promega Corporation, Madison, WI, USA) according to the manufacturer’s directions. DNA fragmentation was determined by using the DeadEnd™ Fluorometric terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) System (Promega Corporation) according to the manufacturer’s directions. Nuclei were stained using Vectasheild mounting medium with DAPI (Vector Laboratories, Inc., Burlingame, CA, USA).
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2

Immunofluorescence Staining of H. pylori Infection

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AGS or GSM06 cells were grown to 70% confluency on glass cover slips in the wells of 24 well cluster plates. Following infection with H. pylori the cells were washed in PBS, fixed in methanol at –20°C, and blocked in 1% normal goat serum. Cells were stained using sera from mice immunized with HpSS1 lysate antigen as the primary antibody, followed by goat anti-mouse FITC conjugate. The cells were counter-stained with AlexaFluor 633 phalloidin (Molecular Probes, Inc., Eugene, OR), mounted in Vectasheild mounting medium with DAPI (Vector Laboratories, Inc., Burlingame,CA), and examined for fluorescence by confocal microscopy using Leica Confocal Software.
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3

In situ Imaging of Oxidative Stress

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In situ staining of superoxide (O2•−) and H2O2 levels were determined using the superoxide indicator dihydroethidium dihydroethidium (DHE) and the ROS indicator 5-(6)-chloromethyl-20,70-dichlorodihydrofluorescein diacetate (CM-H2DCFDA). M.abs bacteria were labeled with Syto-62 according to manufacturer's instruction (Invitrogen, Grand Island, NY). TPA-stimulated THP-1 cells were grown on a glass chamber slide and were infected with Syto-62-labeled M.abs for 1 h, and incubated with media for 4 h at CO2 incubator. Thirty minutes before the infection was complete, DHE, and DCF were added to the assigned chambers. After infection was complete, the medium was removed, and chambers were washed, and mounted with Vectasheild mounting medium with DAPI (Vector Laboratories, Burlingame, CA). Images were viewed using Zeiss 510 Meta Confocal Laser Scanning Microscope.
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4

Metaphase Spread Analysis of T and B Cells

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B and T cells stimulated for 48 hours were arrested in metaphase by incubating with 0.0μg/mL colcemid (KaryoMax) and 0.45mM BrdU (Sigma) for 2 hours. Metaphase arrested cells were isolated by hypotonic treatment (40mM KCl, 0.5mM EDTA, 20mM HEPES, pH7.4) and fixation in methanol:acetic acid (3:1 volume). The fixed cells were then dropped on slides at 4°C and dried at 75°C for 5 minutes. Metaphase spreads were hybridized overnight with relevant Tcrb and Igh bacterial artificial chromosome (BAC) probes: Vβ-DβJβ1, RP23-203H5; Cβ, 164G11; VH-DH, RP24-275L15, and 3'IgH, CT7-199M11. Cβ and 3'IgH probes were labeled using the DIG-NICK Translation Mix (Roche). Vβ-DβJβ1 and VH-DH probes were labeled using the BioPrime DNA Labeling System (Invitrogen). Probes were detected using Fitc-anti-digoxin Fab (Roche) and Texas red-streptavidin (Vector Laboratories). Coverslips were mounted with Vectasheild mounting medium with DAPI (Vector). Images were captured and analyzed using Case Data Manager (Applied Spectral Imaging).
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