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6 protocols using saponin solution

1

Cytokine Production in Stimulated Tregs

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Tregs after CD45RA stimulation were cultured with anti-CD3 (1 μg/ml)(eBioscience) and anti-CD28 (5 μg/ml) (BioLegend, San Diego, CA, USA) in presence of Brefeldin A (10 μg/ml) (Sigma) for 48 h at 37°C. Cells were collected, fixed and permeabilised with 0,5% saponin solution (Sigma). Intracellular staining was carried out using anti-IL-10-PE (Becton Dickinson), anti-IL-4-PeCy5.5 (Becton Dickinson), anti-IFN-γ-FITC (Becton Dickinson) and anti-IL-17-APC (eBioscience) antibodies. Cells were acquired by FACSCanto flow cytometer and analysed by FACSDiva software.
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2

Multiparameter Flow Cytometry for Flavivirus Infection

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Staining with Zombie Aqua (BioLegend) or 7-AAD (eBiosciences) viability dyes excluded dead cells from general analysis. Specific staining of surface markers distinguished cell types using monoclonal antibodies from BioLegend, if not stated otherwise: CCR2 (clone 475301, R&D), CD11b (M1/70), CD11c (N418), CD45 (30-F11), CD80 (16-10A1), CD86 (PO3), CD103 (2E7), Ly6C (AL21), Ly6G (1A8), MHC II (I-A/I-E, M5/114.15.2), and Armenian hamster IgG (HTK888) or rat IgG2b isotype controls (RTK4530, BioLegend; or 141945, R&D), which were conjugated to PacificBlue, Brilliant Violet 605, PE, PE-CF594, PE-Cy7, Alexa Fluor 700, APC-Cy7, or biotin. Antibody stains were performed in D-PBS with no Ca++/Mg++ containing 2% FBS and 2 mM EDTA (LifeTech). Biotinylated antibodies were visualized using streptavidin conjugated to Brilliant Violet 605 or PE-Cy7 (BioLegend). After fixation with 2% formaldehyde (Ted Pella), cells were permeabilized with 1 mg/ml saponin solution (Sigma) containing 2% FBS and 1% normal mouse serum obtained from steady-state mice. Intracellular staining for DENV proteins E (4G2, ATCC) and NS3 (E1D8, [35] (link)), which were conjugated to Alexa Fluor 488 or Alexa Fluor 647, respectively, using protein-labeling kits (LifeTech), identified DENV2-infected cells. Intracellular staining for Langerin (4C7) was used to further dissect cell populations.
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3

Multicolor dSTORM Imaging of HIV Envelope

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COS-7 cells expressing CCR5-YFP or CXCR4-YFP and CD4-mRFP were incubated with non-labelled JRFL or HXB2 virions respectively for 10minutes at 37°C. After a single PBS wash to remove non-primed virions, cells were fixed with 3.7% PFA (Sigma) for 20 minutes at room temperature followed by 5 min permeabilisation with a 2% Saponin solution (Sigma), After 1h blocking with 4% BSA (Sigma), Nanoboosters (Chromotek, Germany) targeting the YFP (GFP_Booster_Atto488) or the RFP (RFP_Booster_Atto594) were added in 1:100 final concentration in blocking buffer and incubated for one additional hour. S Flag signal was introduced in HXB2, thus these virons were labelled with an mouse-anti-FLAG antibody and an anti-mouse Alexa 405 secondary. JRFL was detected with a 2G12 primary antibody and a anti-human- Alexa 633 secondary. These combination of colours was selected to avoid spectral overlap between the three channels (CD4, Co-Receptors and Env) and sequential acquisition was performed from the longest wavelength until the shortest to avoid collateral photobleaching during each dSTORM acquisition (see below).
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4

Netrin-1 Expression in Lymphoma Cells

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Cells in RPMI medium (26 nodal lymphomas and five normal lymph nodes) were formalin-fixed for 15 min, and permeabilized for 10 min with a 0.3% saponin solution (Sigma Aldrich, France). After washing, cells were incubated for 30 min with netrin-1 rat anti-mouse monoclonal antibody (clone, diluted 1:100, R&D Systems, Minneapolis, USA), and 30 min with a secondary polyclonal goat anti-rat/mouse FITC (clone F047902-2, Agilent, Carpinteria, CA). Fluorescence was measured after an ultimate washing, with a cytometer Accuri (Becton Dickinson, France). Results were analyzed with the BD Accuri C6 Software ®® (Becton Dickinson, Le Pont de Claix, France). To discriminate fluorescence intensity between culture cells, evaluation of difference in mean fluorescence intensity (ΔMFI) was performed, as published in Fellman et al. [26 (link)], according to this formula: ΔMFI = (MFI Netrin-1–MFI control) / MFI control. Control cells were incubated with the secondary antibody only.
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5

Splenic Dendritic Cell Immunophenotyping

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Cells were incubated with Fc block (clone 2.4G2) for 20 minutes on ice before surface staining with fluorescently labelled CD11c (clone N418), MHC-II (clone M5/114.15.2), CD4 (GK15), CD8 (clone 53–6.7), Vα2 TCR chain (clone B20.1) antibodies (all from eBioscience). For detection of EphB receptors and Ephrin molecules on splenic CD11chi DC, cells were incubated with recombinant mouse EphB2-Fc or mouse Ephrin B2-Fc chimeric proteins (R and D systems) at a concentration of 200ng/ml for 30 minutes on ice. Bound molecules were detected by incubation with a secondary biotinylated anti-human IgG Fc antibody (eBioscience) for 20 minutes followed by 15 minutes of incubation with APC-conjugated strepatavidin (eBioscience). T cell cytokines were detected by intracellular cytokine staining after fixation of cells in 2% paraformaldehyde solution and permeabilization using 0.5% saponin solution (Sigma).
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6

Bacterial Cell Lysis and Suspension

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PBC bottle was vortexed and 1 ml of PBC broth was collected. Two hundred microliters of 5% saponin solution (Sigma-Aldrich, St. Louis, USA) were added into the PBC broth, mixed thoroughly and incubated at room temperature for 5 mins. The tube was centrifuged at 13,000 rpm for 2 mins, and the supernatant was discarded. The pellet was washed with 1 ml-distilled water and centrifuged at 13,000 rpm for 1 min and the supernatant was discarded. The pellet was washed twice with 1 ml 0.45% sterile saline and the supernatant was discarded after centrifugation. The pellet was resuspended in 30–50 μl of 0.45% sterile saline. This suspension was used for preparing the inoculum for AST according to Vitek colony AST procedures. Ten microliters of the inoculum were inoculated onto SBA for purity check.
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