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4 protocols using goat anti human fc specific antibody

1

Antibody Depletion and Detection in Human Serum

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Human serum (Sigma-Aldrich, St. Louis, MO, USA) was depleted of
endogenous IgG by passage through a protein G-Sepharose column. Antibodies and
ADCs were incubated at a concentration of 40 μg/ml in IgG-depleted serum
for 0, 3, or 5 days at 37 °C followed by immunoprecipitation using
agarose beads coupled to goat anti-human Fc-specific antibody (Sigma-Aldrich).
Immunoprecipitated antibodies and ADCs were run on SDS-polyacrylamide gels and
transferred onto nitrocellulose membranes (0.45 μm pore size; Genesee
Scientific, San Diego, CA, USA). Immunoblotting was carried out using standard
methods with goat anti-human IgG (H + L) antibodies conjugated with HRP (Jackson
Immunoresearch, West Grove, PA, USA). HRP was detected using SuperSignal West
Pico Chemiluminescent Substrate (Thermo Fisher Scientific) followed by scanning
with a C-DiGit blot scanner (LI-COR Biosciences, Lincoln, NE, USA).
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2

Antibody Depletion and Detection in Human Serum

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Human serum (Sigma-Aldrich, St. Louis, MO, USA) was depleted of
endogenous IgG by passage through a protein G-Sepharose column. Antibodies and
ADCs were incubated at a concentration of 40 μg/ml in IgG-depleted serum
for 0, 3, or 5 days at 37 °C followed by immunoprecipitation using
agarose beads coupled to goat anti-human Fc-specific antibody (Sigma-Aldrich).
Immunoprecipitated antibodies and ADCs were run on SDS-polyacrylamide gels and
transferred onto nitrocellulose membranes (0.45 μm pore size; Genesee
Scientific, San Diego, CA, USA). Immunoblotting was carried out using standard
methods with goat anti-human IgG (H + L) antibodies conjugated with HRP (Jackson
Immunoresearch, West Grove, PA, USA). HRP was detected using SuperSignal West
Pico Chemiluminescent Substrate (Thermo Fisher Scientific) followed by scanning
with a C-DiGit blot scanner (LI-COR Biosciences, Lincoln, NE, USA).
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3

Serum Stability Evaluation of Seldegs

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For serum stability assays, endogenous IgGs were depleted from human male AB plasma (Sigma) by passage through protein G-Sepharose (GE Healthcare). Seldegs were incubated in serum at a concentration of 100 nM at 37 °C for 3 or 5 days. Following incubation, Seldegs were immunoprecipitated using agarose beads coupled to goat anti-human Fc-specific antibody (Sigma). Immunoprecipitated Seldegs were run on 12% SDS–polyacrylamide gels, transferred to polyvinylidene difluoride membranes (Millipore) and membranes incubated with horseradish peroxidase-conjugated goat anti-human Fc-specific (H+L) antibody (Jackson ImmunoResearch). Bound secondary conjugate was detected using Westernsure substrate, followed by scanning with a C-DiGit blot scanner (LI-COR).
Seldegs were also incubated in PBS (Lonza) at 4 °C (30 days) or 37 °C for 5 days, followed by analyses using a Superdex 200 5/150 GL column (GE Healthcare), 12% SDS–polyacrylamide gel electrophoresis and surface plasmon resonance (BIAcore).
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4

Serum Stability of MOG-Seldeg-PS Protein

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MOG-Seldeg-PS was incubated in PBS at 4°C for 30 days or 37°C for 5 days, followed by analyses using a Phenomenex Yarra 3 μm SEC-3000 column (Phenomenex, 00H-4513-K0). For serum stability assays, endogenous IgGs were depleted from human serum (Sigma-Aldrich) by passage through protein G-Sepharose (GE Healthcare). MOG-Seldeg-PS was incubated in serum at a concentration of 400 nM at 37°C for 3 or 5 days as described previously.26 (link) Following incubation, proteins were immunoprecipitated using agarose beads coupled with goat anti-human Fc-specific antibody (Sigma-Aldrich). Bound proteins were detected by immunoblotting with HRP-conjugated goat anti-human IgG (H+L) antibody (Jackson ImmunoResearch, West Grove, PA, USA). The immunoreactive bands were detected using WesternSure substrate (Thermo Fisher Scientific), followed by scanning with a C-DiGit blot scanner (LI-COR, Lincoln, NE, USA).
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