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Goat anti human igm

Manufactured by Southern Biotech
Sourced in United States

Goat anti-human IgM is a laboratory reagent used to detect and quantify human immunoglobulin M (IgM) in biological samples. It is a polyclonal antibody produced by immunizing goats with human IgM. The product is designed for research and diagnostic applications where the identification and measurement of human IgM is required.

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6 protocols using goat anti human igm

1

Quantification of Human Serum Antibodies

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To quantify serum or supernatant human antibody, diluted samples were added to plates (Corning Incorporated) coated with goat anti-human IgG Fcγ fragment (Jackson) or goat anti-human IgM (Southern Biotech), washed, and blocked with 2% Bovine Serum Albumin (BSA, Fisher Scientific). Bound human Ig was detected using biotin-conjugated mouse anti-human IgG (BD Pharmingen) or biotin-conjugated mouse anti-human IgM (BD Pharmingen) secondary antibodies, followed by streptavidin-horseradish peroxidase (Thermo Scientific). Colorimetric change by 3,3′,5,5′-Tetramethylbenzidine substrate solution (Thermo Scientific) was stopped by 2M sulfuric acid (Sigma), and optical densities determined by spectrophotometer 450nm absorbance. Human serum with known IgM and IgG concentrations (Bethyl) established a standard.
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2

Quantifying Polyreactive IgM in Transplanted Patients

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Nunc MaxiSorp ELISA plates (Thermo Fisher Scientific 44-2404-21) were coated overnight with goat anti–human IgM (4 μg/mL; SouthernBiotech 2020-01, RRID:AB_2795599). After blocking, the plates were incubated with serum from transplanted patients. Bound IgM was detected by adding HRP-conjugated goat anti–human IgM (4 μg/mL; SouthernBiotech 2020-05, RRID:AB_2795603). Alternatively, polyreactive natural IgM was detected by analyzing the amount of immunoglobulin bound to LPS adapted from the protocol Singh et al. described (59 (link)). Briefly, Nunc MaxiSorp ELISA plates were coated overnight at room temperature with LPS (10 μg/mL; Alpha Diagnostic International LPS12-1). After blocking, human sera were incubated for 2 hours at 37°C. Bound IgM was detected by adding goat anti–human IgM–HRP (4 μg/mL; SouthernBiotech 2020-05, RRID:AB_2795603). The reactions were visualized by subsequent addition of 2,2′-Azino-bis (3-ethylbenzthiazoline-6-sulfonic acid) substrate (SouthernBiotech 0202-01). All readings were recorded at 405 nm.
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3

Immune Cell Adhesion Protein Assay

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Human E-selectin/Fc, human ICAM-1/Fc, human VCAM-1/Fc and human CXCL12 were from R&D Systems (R&D Systems, Minneapolis, MN, USA); goat anti-human IgM was from SouthernBiotech (SouthernBiotech, Birmingham, AL, USA); fluorescein isothiocyanate (FITC) goat secondary antibody to mouse was from Sigma (Sigma-Aldrich, St. Louis, MO, USA); KIM127 mouse monoclonal antibody was from American Type Culture Collection (ATCC, Rockville, MD, USA); 327A mouse monoclonal antibody was kindly provided by Dr. Kristine Kikly (Eli Lilly and Co., Indianapolis, IN, USA); goat F(ab’)2 anti-human IgM was from Southern Biotech (Southern Biotech, Birmingham, AL, USA); Tyrphostin and rabbit polyclonal anti-actin antibody were from Sigma; Ibrutinib was from Selleck Chemicals (Selleck Chemicals, Houston, TX, USA); PE mouse anti-BTK (pY223) antibody was from BD Biosciences (BD Biosciences, San Jose, CA, USA); rabbit monoclonal anti-JAK2 (D2E12) was from Cell Signaling Technology (Danvers, MA, USA); siRNAs (ON-TARGETplus SMARTpool) were from Thermo Fisher Scientific (Fremont, CA, USA).
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4

Ibrutinib Inhibition of BCR Signaling

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CLL cells purified through negative column selection as detailed above, were plated at 5×106 cells/500μl RPMI1640 medium without FCS and rested for 1 hour at 37°C and subsequently pre-incubated for 1 hour at 37°C as indicated with ibrutinib at 0 μM (DMSO only) or 0.25 μM, 0.5 μM or 1 μM. Cells were stimulated with goat anti-human IgM (Southern Biotech, cat #2020-08) at 10μg/ml for 15′ and subsequently pelleted through centrifugation at 4°C. Cell pellets were lyzed in lysis buffer containing 1% NP-40 detergent (#DSC41010; Dot Scientific), 150mM NACL, 25mM Tris pH 8.0 (#T6066; Sigma Aldrich), 20mM NAF, 2mM EGTA, 2mM EDTA (#ED2SS; Sigma Aldrich), supplemented with protease inhibitors (#P8340) and phosphatase inhibitors (#P0044), and sodium orthovanadate (#450243; Sigma-Aldrich, St. Louis, MO), and PMSF (#36978; Thermo Scientific). The detergent-soluble fraction of the cell lysates was cleared by centrifugation at 14,000 rpm for 10 min. Protein was fractionated through SDS-PAGE and prepared for immunoblotting using standard procedures. For immunoblotting the following antibodies were used (all rabbit anti-human antibodies from Cell Signaling Technologies): PLCy2: #3872; p1217-PLCy2: #3871; BTK: #8547; p223-BTK: #5082s; AKT: #9272; p473-AKT: #9271s; ERK: #4695; p202/204-ERK: #4370.
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5

Detection of IgM-Secreting B Cells

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On the fourth day of primary B cell culture, Immunolon® flat-bottom 96-well microtiter plates (ThermoFisher Scientific) were coated with goat antihuman IgM (Southern Biotech) at a final concentration of 10 µg/ml in HBSS for 1 h at 37°C. Plates were then washed and blocked with culture medium for 1 h at room temperature. Live cells were counted via trypan blue exclusion and seeded as serial 1:2 dilutions in fresh culture medium in the plate in duplicate. Plates were briefly spun to settle cells to the bottom and incubated overnight in a 37°C humidified 5% CO2 incubator. Plates were subsequently washed and biotinylated goat antihuman IgM was added at a final concentration of 1.6 µg/ml. The plates were incubated for 2 h at 37°C. Plates were washed again and alkaline phosphatase (AP)-conjugated streptavidin was added at a dilution of 1:1,000 and incubated for 1 h at 37°C. Plates were washed and developing solution was added: 1 mg/ml BCIP (Sigma) in AMP buffer. Color development took place at room temperature in the dark until spots appeared; plates were then rinsed with dH2O, dried and counted under a light microscope.
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6

ZIKV Antibody Detection Assay

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Falcon 96-well plates were precoated with 100 μl of ZIKV (1 × 1010 genome copies/ml) diluted in Tris-buffered saline (TBS;pH 7.4) overnight at 4°C. After blocking with TBS containing 5% skim milk was performed for 1 h at room temperature, 100 μl of plasma or purified IgG samples serially diluted in blocking buffer containing 0.05% Tween 20 was added and incubated for 1 h at room temperature, followed by 1:3,000-diluted horseradish peroxidase-conjugated goat anti-human IgG (Jackson Research Laboratories) or goat anti-human IgM (Southern Biotech) for 1 h. After washing with TBS containing 0.05% Tween 20, the reaction was developed by the use of the peroxidase substrate tetramethylbenzidine (Millipore) for 3 min and stopped by adding the same volume of 2 M phosphoric acid. The absorbance at 450 nm was read in SpectraMax Paradigm plate reader (Molecular Devices).
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