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5 protocols using biotin rat anti mouse igg1

1

CFSE-Labeled Mouse B Cell Proliferation

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B cells were isolated by lysing red blood cells with ACK lysing buffer, followed by reverse selection using anti-CD43 MACS micro-beads (Miltenyi Biotech 130-049-801) and a Mini-MACS column. Collected B cells were stained with 5 μM CFSE for 10 minutes at 37°C and then cultured in RPMI-1640 containing 10% FBS, 1x penicillin/streptomycin, 1% L-glutamine, 1x MEM non-essential amino acids, 1% sodium pyruvate, 1% HEPES, and 53 mM 2-mercaptoethanol. Media was supplemented with 25 μg/ml LPS from E.coli (Sigma L2630), 50 U/ml Interleukin-4 (Sigma I1020), and 1:1000 rat anti-mouse anti-CD180 (BD Pharmingen 552128). Cells were cultured for 72 hours with VX-984 (0.2, 0.4, and 0.8 μM) at 37°C with 5% CO2.
B cells were blocked with 5 μl of anti-mouse CD16/CD32 (BD pharmingen 553141). Primary antibodies Biotin-rat anti-mouse IgG1 (BD Pharmingen 550331) and FITC-rat anti-mouse CD45R/B220 (BD Pharmingen 553088) were added at 10 μl of a 1:100 dilution, followed by 10 μl of a 1:100 dilution of Streptavidin-A647 (Life Technologies S32357). Cell proliferation and IgG+ cells were measured using a Becton Dickinson FACSCalibur and data were analyzed by FlowJo software.
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2

SARS-CoV-2 Spike Protein Antibody Assay

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96-well plate (Thermo Fisher Scientific, MA, USA) were coated with 5 µg/ml of WT, Beta, Delta, or Omicron RBD or spike protein at 4 °C overnight. Plates were then blocked with 3% skim-milk/PBS at room temperature for 2 h. Serum samples were serially diluted and added to the blocked plates before incubation at room temperature for an hour. Following incubation, bound antibodies were either detected with goat anti-mouse IgG Fc HRP-conjugated antibody (Chemicon, CA, USA) for total IgG assessment or biotin-rat-anti-mouse IgG1 (BD Biosciences, NJ, USA) and biotin-rat-anti-mouse IgG2a (BD Biosciences, NJ, USA), and then followed by HRP- streptavidin (R&D Systems, MN, USA) for IgG subclass assessment. Plates were developed by TMB substrate (BD Biosciences, NJ, USA) and the reactions were stopped by adding 2N H2SO4. The absorbance at 450 nm were measured with EMax Microplate reader (Molecular Devices, CA, USA). The endpoint dilution titer was determined when titer value of the last serum dilution was twofold above the blank value.
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Quantification of Antigen-Specific Antibodies

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Whole blood was collected on day 21. Clotting was allowed overnight at 4°C and serum was recovered after centrifugation for 10 min at 8000 xg. Samples were serially diluted 1:1 in assay diluent and incubated on antigen-medium-binding pre-coated plates (10 μg/mL OVA or 50 μg/mL ClfA in sodium carbonate buffer, pH 9.5). Ag-specific serum Ab titers were measured using a standard ELISA protocol and the following antibodies: goat anti-mouse total IgG-HRP from Southern Biotech (1/5000 dilution), biotin rat anti-mouse IgG1 from BD (1/4000 dilution), biotin rat anti-mouse IgG2b from BD (1/4000 dilution), and goat anti-mouse IgG2c-HRP from AbD Serotec (1/2000 dilution) and developed using streptavidin-HRP or OPD substrate directly as required. OD values were obtained using a VersaMax microplate reader at 492nm. Antibody concentrations were expressed as Log10 endpoint titers calculated by regression of a curve of OD values versus reciprocal serum levels to a cutoff point of 4 SD above the blank.
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ELISA for Mouse Antibody Isotypes

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Based on the antigen used for immunizations, NP conjugated to BSA at a >20 ratio (Biosearch Technologies), PE or OVA all diluted in PBS were coated onto separate 96 well plates (Greiner Bio-one) at 2 μg/mL and incubated overnight at 4 °C. Plates were washed then blocked with casein (Thermo Scientific) for one hour at room temperature (RT). Serum samples were serially diluted in casein then added to the plates and incubated for two hours at RT. After washing, biotin rat anti-mouse IgG1 (BD), peroxidase conjugated goat anti-mouse IgM (Jackson Immunoresearch) or biotin rat anti-mouse IgE (BD) was added to the plates and incubated for one hour at RT. Plates were washed and streptavidin HRP (Jackson Immunoresearch) was added to the IgG1 and IgE plates and incubated for thirty minutes at RT. Plates were washed then developed for twenty minutes with an o-Phenylenediamine dihydrochloride tablet (Sigma) dissolved in 100 mM Sodium phosphate dibasic (Mallinckrodt), 50 mM citric acid (Mallinckrodt) and 0.04% hydrogen peroxide (Mallinckrodt) at pH 5.0. Reactions were stopped using 1N HCL (Fisher Scientific) and plates were read at 490λ using a Molecular Devices Spectra Max 340 PC running Soft Max Pro 3.1.2. All antibody data are presented at IgM (1:1000), IgG1 (1:80,000), and IgE (1:100) serum dilutions which represent non-saturating concentrations.
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5

Quantifying HDM-Specific Antibodies

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Total serum IgE was assessed using OptEIA ELISA kits (BD Biosciences, San Diego, CA) according to the manufacturer’s instructions. An indirect ELISA method was used to assess the HDM-specific IgE and IgG1 levels in serum samples. Briefly, 96-well microtiter plates were coated overnight with 100㎍/mL HDM in PBS. The next day, 200㎕ of blocking solution (1% BSA in PBS) was added to the plate before the addition of serum samples that had been diluted 1:200 (for HDM-specific IgG1) in blocking buffer, or undiluted (for HDM-specific IgE) for 1h. Subsequently, 100㎕ of sample was added to the plate for 2 h, followed by biotin-rat-anti-mouse IgE or biotin-rat-anti-mouse IgG1 (2㎍/ml; BD Biosciences, San Diego, CA) for 1 h. To detect biotin-labeled IgE or IgG1, streptavidin-HRP (1:100, R&D Systems, Minneapolis, MN) was added to the plate for 30 min. Next, a tetramethylbenzidine substrate reagent set (1:1, BD Bioseicences) was added to detect levels of IgE or IgG1.
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