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7 protocols using anti igm hrp

1

Isotype-Specific ELISA Protocol

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Plates were pre-coated with Goat anti-Mouse Ig (Southern Biotech), blocked with PBS-BB (PBS + 0.05% Tween 20 + 1% BSA) and serum was applied. HRP conjugated secondary antibodies anti-IgA-HRP, anti-IgG3-HRP, anti-IgG1-HRP, anti-IgM-HRP, anti-IgG2b-HRP, and anti-IgG-HRP (all from Southern Biotech) were applied and subsequently exposed with a slow kinetic TMB solution (Sigma). The reaction was terminated with 1N HCL and absorbance was measured at 450 nm on a SpectraMax 340 PC plate reader and analyzed using SoftMax Pro 4.8 Software.
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2

Quantitative IgM ELISA Assay

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Plates were coated with anti-IgM (1 μg/mL; Southern Biotech) overnight. Plates were washed with PBS/0.04% Tween-20, PBS, then water before the addition of cell culture supernatant or IgM standard (TEPC183; Sigma-Aldrich) to the appropriate wells. After 4 hours, plates were washed and incubated with anti-IgM-HRP (1 μg/mL; Southern Biotech) for a further 4 hours. Plates were washed and bound IgM was visualized by the addition of 2,2’-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS; Sigma-Aldrich) substrate solution (0.54 mg/mL ABTS, 10.5 mg/mL citric acid, 15 mg/mL trisodium citrate dihydrate, 0.03% hydrogen peroxide).
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3

Quantifying NP-KLH Antibody Responses

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NP-KLH-specific antibodies were measured with 10 μg/ml of NP-BSA (Bioresearch Technologies) as the coating reagent for ELISA. Diluted serum was incubated in the wells for 1 h at room temperature. Then, NP-KLH-specific antibodies (IgG, IgG1, IgG2a, IgG2b and IgM) were detected using goat polyclonal anti-IgG HRP (Southern Biotech), anti-IgG1 HRP (Southern Biotech), anti-IgG2a HRP (Southern Biotech), anti-IgG2bHRP (Southern Biotech), and anti-IgM HRP (Southern Biotech).
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4

Isotype-Specific ELISA Protocol

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Plates were pre-coated with Goat anti-Mouse Ig (Southern Biotech), blocked with PBS-BB (PBS + 0.05% Tween 20 + 1% BSA) and serum was applied. HRP conjugated secondary antibodies anti-IgA-HRP, anti-IgG3-HRP, anti-IgG1-HRP, anti-IgM-HRP, anti-IgG2b-HRP, and anti-IgG-HRP (all from Southern Biotech) were applied and subsequently exposed with a slow kinetic TMB solution (Sigma). The reaction was terminated with 1N HCL and absorbance was measured at 450 nm on a SpectraMax 340 PC plate reader and analyzed using SoftMax Pro 4.8 Software.
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5

Comprehensive B Cell Immunophenotyping

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The following antibodies were used for immunoblotting: anti-SYK (N-19; Santa Cruz), anti-IgM-HRP (Southern Biotech), anti-Cav1 (D46G3; Cell Signaling), anti-RAC1 (Millipore), anti-LYN (Cell signaling) and anti-Tubulin (Sigma).
The following antibodies were used for flow cytometry: anti-B220-PECy7 (RA3-6B2), anti-IgD (11-26), anti-IgM (polyclonal), anti-CD19 (1D3), anti-CD4 (GK1.5 and RM4-5), anti-CD8 (53-6.7), anti-CD93 (AA4.1), anti-CD69-PECy7 (H1.2F3), anti-CD86-PE (GL-1), anti-GL7, anti-CD95 (15A7) (all from eBioscience), anti-λLC λ1, λ2 & λ3 (R26-46), anti-κLC (187.1), anti-CD45.1 (A20), anti-IgD-FITC (11-26c.2a), anti-CD45.2 (105), Ki-67 (B56) (all from BD Pharmingen), anti-CD19 (6D5) (Biolegend). NP-BSA-biotin was from Biosearch Technologies. Anti-IgM-Fab’2-Alexa 649 was from Jackson ImmunoResearch (goat polyclonal). CSFE was from Sigma.
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6

Antibody and BAFF Quantification by ELISA

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ELISA was used to detect antigen-specific IgM, IgG1, IgG2b, and IgG3 titers by capturing serum antibodies using NIP11-OVA (Jackson ImmunoResearch, Inc) coated plates (NP-specific) or methylated BSA and calf thymus DNA (Sigma-Aldrich) coated plates (DNA-specific), as described previously (30 (link), 31 (link)). Bound antibody was detected with anti-IgM-HRP, anti-IgG1-HRP, anti-IgG2b-HRP or anti-IgG3-HRP (Southern Biotech), TMB substrate (Biolegend), and read on a Molecular Devices microplate reader at 450nm. Titer was determined to be lowest serum dilution achieving signal greater than 2x background. BAFF in sera was measured by a sandwich ELISA using BAFF- specific clones 5A8 (capture) and 1C9-biotin (detection) (Axxora) as performed previously (31 (link)). Recombinant mouse BAFF (R&D Systems) served as standard.
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7

Serum Antibody Isotype Analysis in Mice

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Blood for serum antibody analysis was collected from all mice at 49 days of age. Plates were coated with anti-mouse IgM, IgG1, IgG2b, IgG2c, IgG3 or IgA (Southern Biotech, Birmingham, AL, USA) for 24 h before the addition of diluted serum. IgM, IgG1, IgG2b, IgG3 standards were obtained from Sigma-Aldrich, IgG2c standard was from Southern Biotech, and IgA standard was from Organon Tekcika–Cappel (Durham, NC, USA). Serum Ig was detected with anti-IgM-HRP, anti-IgG1-HRP, anti-IgG2b-HRP, anti-IgG2c-HRP, anti-IgG3-HRP, anti-IgA-biotin and streptavidin-HRP (Southern Biotech) and visualised using ABTS substrate (2,2′-Azinobis (3-ethylbenzthiazoline Sulfonic Acid); Sigma-Aldrich). All samples and standards were measured in duplicate.
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