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12 protocols using anti human igg fitc

1

Blocking BAFF-R Signaling in B Cells

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Nilotinib and anti-BAFF-R B-1239 antibodies (unconjugated and Alexa-647 labeled) were from Novartis. These antibodies were selected from the Human Combinatorial Antibody Library (HuCAL GOLD{r}), using phage display technology (8 (link)). The B-1239 mAb was produced in a fucosyl-transferase deficient CHO cell line (BioWa Potelligent Technology, BioWa Inc., Princeton, NJ, USA) (20 (link)), with a humanized sequence to optimalize ADCC activity. B-1239 was selected based on its property of blocking the BAFF/BAFF-R interaction and signaling via BAFF. Anti-BAFF-R antibody clone 11c1, anti-human CD19 and CD10 antibodies were from BD Biosciences (San Jose, CA, USA). FITC-anti-human IgG was from Sigma Aldrich (CA, USA). Recombinant huBAFF and the function-blocking anti-BAFF-R antibodies were purchased from R&D Systems (MN, USA). Bcr N-20, BAFF-R and Gapdh antibodies for Western blotting were from Santa Cruz, eBiosciences and Millipore, respectively. Cell Mask Orange and Deep Red were from Life Technologies (Eugene, OR).
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2

Immunofluorescence Analysis of Ig Deposition

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Immunofluorescence analysis was conducted to measure immunoglobulin deposition in human and mouse kidneys (29 (link)). FITC anti-human IgG (Sigma-Aldrich, St. Louis, MO, USA) and human IgE (eBioscience, San Diego, CA, USA), as well as FITC anti-mouse IgG (Santa Cruz Biotechnology, CA, USA) and IgE (eBioscience, San Diego, CA, USA) were employed. For human biopsy, the fluorescence intensity of glomerular staining was graded on a scale from 0 to ++++ in increments of 0.5+. Images were recorded under a TCS SP5 II confocal microscope (Leica Microsystems, Mannheim, Germany).
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3

Quantifying SARS-CoV-2 ACE2 Binding

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Virus producing HEK293T cells were harvested 72 hrs after transfection. Cells were dissociated by incubation at 37°C in PBS + 5mM EDTA for 30 min. Then, cells were fixed in 4% formaldehyde in PBS, and stained with sACE2-humanFc fusion protein (construct is a gift of Jason McLellan, University of Texas at Austin) or mouse anti-Flag antibody (Sigma, F3165). Cells were then stained with anti-human-IgG-FITC (Sigma, F9512) or anti-mouse-IgG-FITC (Sigma, F0257) and processed by a Life Technologies Attune NxT flow cytometer. Results were processed using FlowJo v7.6.5 (Ashland, OR). Relative ACE2 binding was then determined by dividing sACE2 signal by anti-Flag signal measured by mean fluorescence intensity.
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4

Flow Cytometry and Western Blot Assays

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Anti-human IgG–FITC and anti-mouse IgG-FITC were from Sigma-Aldrich and were used at a dilution of 1:100 in HBSS containing 0.15 mM CaCl2 and 1 mM MgCl2 (HBSS++) and 1% BSA (HBSS++/BSA) in flow cytometry assays. Goat anti-human FH, alkaline phosphatase conjugated anti-human IgG (Southern Biotechnology) and donkey anti-goat IgG were used in Western blots a dilution of 1:1000 in PBS with 5% non-fat dry milk. Anti-C4BP mAb 104 (34 (link), 35 (link)) was used in flow cytometry assays at a concentration of 10 μg/mL.
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5

Sheep anti-human C3c and IgG detection

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Sheep anti-human C3c-FITC was obtained from AbD Serotec (cat. # AHP031F), and anti-human IgG FITC was from Sigma. Both antibodies (Abs) were used at a dilution of 1:200 in HBSS++ and 1% bovine serum albumin (BSA) (HBSS++/BSA) in flow cytometry assays.
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6

Flow Cytometry Antibody Labeling

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Anti-human IgG FITC (Sigma), anti-human C3c-FITC (BioRad), and anti-mouse C3 FITC (MP Biomedicals) were used in flow cytometry assays, all at a dilution of 1:100 in Hanks Balanced Salt Solution (HBSS) containing 0.1% BSA and 1 mM CaCl2 and 1 mM MgCl2 (HBSS++/BSA).
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7

SARS-CoV-2 Spike Protein Cell Surface Expression

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In order to analyze transfected cells for cell surface expression of S protein, 2 × 105 cells of each of transfected and untransfected cells stained with SARS-CoV-2 Spike antibody (SinoBiological) and Anti-human IgG FITC (Sigma–Aldrich®). After staining with primary and secondary antibodies, cells were acquired on BD FACS Lyrics and analyzed by Flowjo V10 (BD Biosciences).
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8

Flow Cytometry Antibody Labeling

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Sheep anti-human C3c-FITC was obtained from AbD Serotec (cat. # AHP031F), anti-mouse IgG FITC and anti-human IgG FITC were from Sigma. Both antibodies (Abs) were used at a dilution of 1:200 in HBSS++ and 1% bovine serum albumin (BSA) (HBSS++/BSA) in flow cytometry assays.
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9

Flow Cytometry and Western Blot Antibody Protocols

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Anti-human IgG–FITC was from Sigma-Aldrich and was used at a dilution of 1:100 in HBSS containing 0.15 mM CaCl2 and 1 mM MgCl2 (HBSS++) and 1% BSA (HBSS++/BSA) in flow cytometry assays. Goat anti-human FH, alkaline phosphatase conjugated anti-human IgG (Southern Biotechnology), and donkey anti-goat IgG were used in Western blots a dilution of 1:1,000 in PBS with 5% non-fat dry milk.
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10

Multiscreen Assay for Antigen-Specific IgG/IgA

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MultiscreenHTS HA plates (Millipore, MSHAN4510) were coated with 5μg/mL F protein antigen (Sino Biological Inc), 10μg/mL Human Serum Albumin (HSA, Sigma), 5μg/mL tetanus toxoid protein (Statens Seruminstitute) and 10μg/mL polyvalent goat anti-human immunoglobulins (Caltag). After washing, plates were blocked with 1% skimmed milk for 45 minutes at 37°C before 100μL/well PBMCs in R10 (RPMI, 10% Foetal Bovine Serum, 2mM L-Glutamine, 50μg/ml Streptomycin, 50U Penicillin) were added at a starting dilution of 2×106/mL and incubated overnight at 37°C, 5% CO2, 95% humidity. After washing plates were developed anti-human IgG-FITC (Sigma) and anti-human IgA-Biotin (AbD Serotec). After washing anti-FITC AP (Sigma) and Streptavidin-HRP (AbD Serotec) were added for 30 minutes at room temperature. Following final washes 3-Amino-9-ethylcarbazole (AEC) substrate kit (Sigma) was added for 30 minutes at room temperature, washed with dH2O and 100μL/well Vector Blue substrate (Vector Laboratories) added for 10 minutes at room temperature before a final wash in dH2O. After drying overnight plates were read using Autoimmun Diagnostika (AID version 5.0) and responses measured as the antigen-specific spots per million PBMCs with HSA background subtracted. A positive response was defined as any detection of spots above HSA background.
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