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Goat anti human iga

Manufactured by Southern Biotech
Sourced in United States

Goat anti-human IgA is a laboratory reagent used to detect and quantify human immunoglobulin A (IgA) in biological samples. It is produced by immunizing goats with purified human IgA and isolating the specific antibodies. This product can be used in various immunoassay techniques, such as ELISA, Western blot, and immunoprecipitation, to measure IgA levels in research and diagnostic applications.

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4 protocols using goat anti human iga

1

Quantifying Intestinal Antibody Levels

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Homogenized intestinal contents were resuspended at 0.1 mg/μL in PBS with protease inhibitors (Sigma), homogenized, and centrifuged at 400g to remove large debris. Supernatant was filtered through a sterile 70 μm strainer and centrifuged at 8000g to pellet bacteria. This supernatant was collected and assayed for free Ig by ELISA. The bacterial pellet was resuspended in PBS 0.25% BSA with SYTO BC (Life Technologies) and 5% goat serum and then stained with biotinylated goat anti-mouse IgA, goat anti-human IgA, or goat anti-mouse IgM (Southern Biotech). After washing, bacteria were stained with streptavidin-APC (BioLegend). Bacteria were washed and resuspended in PBS 0.25% BSA with DAPI (Life Technologies) prior to flow cytometry using a low FSC and SSC threshold to allow bacterial detection. See also Supplemental Experimental Procedures.
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2

Fluorescent Antibody Labeling Protocol

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IR800 label (100 μg) (Licor, Westburg, Netherlands) was dissolved in 25 μl distilled water. Subsequently, IR800 label was conjugated to secondary antibodies by mixing 100 μl goat-anti-human IgA (Southern Biotech, USA, Alabama) or rabbit-anti-human IgG (Thermo Fisher, Netherlands) with 1 or 2 μl IR800 label, respectively. Unbound IR label was removed from the samples using ZEBA spin desalting column (Thermo Fisher, Netherlands).
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3

Antibody Binding to Unpermeabilized Cells

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We measured antibody binding to whole (un-permeabilized) un-infected HEp-2 cells by flow cytometry. Briefly, we collected HEp-2 cells and washed 3× with DPBS-BSA before counting. ~1 million cells/condition were stained with a final concentration of 100 μg/mL, 10 μg/mL, or 1 μg/mL antibody diluted in DPBS-BSA for 20 min at 4C. Cells were then washed 3× with DPBS-BSA and stained with either goat anti-human IgG labeled with PE (Southern Biotech) or goat anti-human IgA (Southern Biotech) labeled with PE diluted 1:1,000 in DPBS-BSA for 20 min at 4C. Cells were washed a final time and fluorescence acquired on a 4-Laser Fortessa (BD Biosciences). FCS files were analyzed, and figures generated using CytoBank. Data shown is representative of at least 2 separate experiments with different antibody preparations. The following reagent was obtained through the NIH HIV Reagent Program, Division of AIDS, NIAID, NIH: Anti-Human Immunodeficiency Virus (HIV)-1 gp41 Monoclonal Antibody (4E10), ARP-10091, contributed by DAIDS/NIAID.
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4

Evaluating Antibody Responses via ELISA

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SIF treated samples were evaluated for immunoreactivity using antigen-specific ELISA. For IgG and mIgA ELISA, Corning polystyrene 96-well plates (#9018) were coated overnight at 4 °C with antigen (LT, gp120, or CfaE) at 100 ng/well   followed by blocking with ELISA buffer (1X Blocker BSA [ThermoFisher #37525], 0.05% Tween-20 in PBS). SIF samples were diluted in ELISA buffer to a final concentration of 1 μg/mL based upon the initial concentration of antibody used in the assay and titrated 2-fold. Following a thirty minute incubation, plates were washed 3x with PBST (PBS + 0.05% Tween-20) and incubated with horseradish peroxidase conjugated Goat-anti-human IgG (Southern Biotech #2040-03) or Goat-anti-human IgA (Southern Biotech #2050-05) in ELISA buffer for thirty minutes. After a second wash step, plates were developed using a TMB 2-Component Microwell Peroxidase Substrate Kit (SeraCare #5120-0047) and background corrected absorbance (A450) was determined using a Biotech Epoch plate reader with Gen5 software. In the case of dIgA and SIgA, ELISA was carried out essentially as described above with the exception of using a monoclonal mouse anti-human J-chain antibody followed by HRP-conjugated Goat-anti-mouse IgG (Southern Biotech #1030-05) for detection.
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