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3 protocols using anti human ig

1

Ex-vivo ELISpot for Antibody-Secreting Cells

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Direct ex-vivo ELISpot was performed to determine the
number of total, vaccine-binding, or recombinant HA-binding IgM-secreting cells
present in PBMC samples. ELISpot plates (Millipore) were coated overnight at
4°C with QIV (diluted 1:100), tetanus/diphtheria vaccine (diluted 1:50),
and 10 µg/mL anti-human Ig (Jackson ImmunoResearch) and 3 µg/mL
recombinant HA proteins. Plates were blocked the following morning for 90 min at
37°C with RPMI 1640 supplemented with 10% FBS. Dilutions of washed PBMCs
were incubated for 18 h in RPMI supplemented with 10% FBS. After washing the
plates, secreted antibodies were detected with anti-human IgM-biotin
(Invitrogen, 1:2000) and streptavidin-HRP (Jackson ImmunoResearch), and plates
were developed with AEC substrate (Sigma). Total, vaccine-binding, or
recombinant HA-binding IgG and IgA-secreting cells were detected using IgG/IgA
double -color ELISpot Kits (Cellular Technologies, Ltd.) according to the
manufacturer’s instructions. ELISpot plates were analyzed using an
ELISpot counter (Cellular Technologies Ltd.).
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2

Ex-vivo ELISpot for Antibody-Secreting Cells

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Direct ex-vivo ELISpot was performed to determine the
number of total, vaccine-binding, or recombinant HA-binding IgM-secreting cells
present in PBMC samples. ELISpot plates (Millipore) were coated overnight at
4°C with QIV (diluted 1:100), tetanus/diphtheria vaccine (diluted 1:50),
and 10 µg/mL anti-human Ig (Jackson ImmunoResearch) and 3 µg/mL
recombinant HA proteins. Plates were blocked the following morning for 90 min at
37°C with RPMI 1640 supplemented with 10% FBS. Dilutions of washed PBMCs
were incubated for 18 h in RPMI supplemented with 10% FBS. After washing the
plates, secreted antibodies were detected with anti-human IgM-biotin
(Invitrogen, 1:2000) and streptavidin-HRP (Jackson ImmunoResearch), and plates
were developed with AEC substrate (Sigma). Total, vaccine-binding, or
recombinant HA-binding IgG and IgA-secreting cells were detected using IgG/IgA
double -color ELISpot Kits (Cellular Technologies, Ltd.) according to the
manufacturer’s instructions. ELISpot plates were analyzed using an
ELISpot counter (Cellular Technologies Ltd.).
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3

Intracellular IL-10 Profiling in MS B-cells

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For intracellular FACS of IL-10 in B-cell populations, we obtained fresh PBMCs from 5 IFN-β treated MS patients and 5 healthy volunteers and cultured at 2.5×106 cells/ml with 3ug of anti-human Ig (Jackson Immunoresearch), 1ug of anti-human CD40 (Ebioscience), 40nM CpG ODN 2006 (Invivogen), and Brefeldin A (GolgiPlug, BD Bioscience) in complete RPMI supplemented for 5 hrs then surface stained with anti-CD19 PerCP-Cy5.5, anti-CD24 FITC and anti-CD38 PE. Cells were then fixed, permeablized using the intracellular FACS kit (BD Bioscience) and stain with anti-human IL-10 APC (Biolegend). To assess secreted IL-10 by ELISA, fresh PBMCs (2.5×106 cells/ml) from 3 healthy volunteers were stimulated with or without anti-human Ig, anti-human CD40 and CpG in the presence or absence of 1000 units/ml of recombinant human IFN-β (PBL interferon source) for 72 hrs. IL-10 in culture supernatants were assessed by a Human IL-10 ELISA Kit (eBioscience).
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