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11 protocols using human ifn β elisa kit

1

Quantifying Cytokine Secretion After Viral Infection

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Cell culture supernatants were collected 12 h after H1N1 virus infection. Secreted IFN-α and IFN-β levels in the cell supernatants were determined with human Interferon-α ELISA kit (Dakewe, Shenzhen, China) and human IFN-β ELISA kit (PBL interferon source, U.S.A.).
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2

Quantifying IFN-β Concentration in Cell Supernatants

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Cell culture supernatants were harvested 24 h after treatment and used directly for measurement of IFN-β concentration. IFN-β concentrations were determined using human IFN-β ELISA kit (PBL Assay Science, Piscataway, NJ, USA).
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3

Poly I:C Stimulation of OSM-Primed Cells

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Subconfluent cultures (70–80%) were left untreated or pre‐incubated for 2 hrs with 20 ng/ml OSM before stimulation with 5 or 100 μg/ml poly I:C for 2 hrs. Supernatants were collected, concentrated and analysed by ELISA. The human IFN‐β ELISA kit was purchased from PBL Assay Science, Piscataway, NJ, USA (# 41410) and used according to the manufacturer's protocol.
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4

Cytokine Profiling in Plasma

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Plasma collected by Ficoll isolation from heparinized whole blood was clarified by centrifugation. Circulating cytokine levels were determined in magnetic Luminex assays with the Bio-Plex Pro Human Inflammation (BioRad 171al001m) and the MILLIPLEX MAP Human Cytokine/Chemokine Magnetic Bead Panel (Millipore Sigma HCYTMAG-60K-PX30) according to the manufacturer’s protocol.
ELISAs were performed according to the manufacturer’s protocols. Human IFN-β ELISA Kit (PBL Assay Science 41410-2); Human IL-6 DuoSet ELISA (R&D Systems DY206-05); IL-18 Human ELISA Kit (Thermo Fisher BMS267-2).
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5

Human and Mouse IFNβ ELISA Assay

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The human IFNβ ELISA kit (PBL Assay Science, # 41410-2) and mouse IFNβ ELISA kit (PBL Assay Science, # 42400-2) were used. The ELISA assays were performed according to the manufacturer’s protocols.
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6

Quantifying IFN-λ1 and IFN-β in HIV Infection

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IFN-λ1 and IFN-β concentrations in the supernatants of mock, HIV-infected, and/or IFN-treated HCs (500,000 cells per condition) and accompanying controls were assessed in duplicate using the Human IL-29/IFN-λ1 DuoSet ELISA Kit (DY7246; R&D Systems, Minneapolis, MN, USA) and the Human IFN-β ELISA Kit (41410; PBL, Piscataway, NY, USA) according to the manufacturers’ instructions. Plates were read on a SpectraMax 250 plate reader and concentrations were determined by comparison to a standard curve.
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7

Quantifying IFNα and IFNβ in Cells

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To detect IFNα and IFNβ levels in medium, cells were cultured in serum free medium and treated with indicated drugs for 48 hours. Supernatant was then collected and concentrated using a Pierce protein concentrator (Thermo-Fisher). To test IFNα and IFNβ in lysates, cell and tumor lysates were extracted using RIPA buffer. Total protein concentrations were determined by Pierce BCA Protein Assay Kit (Fisher Scientific). Then, the levels of IFNα and IFNβ protein were measured by ELISA using human IFNα ELISA kit (41100) and human IFNβ ELISA kit (41440), from PBL Assay Science (Piscataway, NJ) according to the manufacturer’s protocol.
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8

Measuring IFN-β Secretion in Oncolytic Virus-Infected Cells

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Cells in 2D culture were infected with oVSV-GFP at 1 MOI for 1 h, then washed and given fresh media. Culture media was collected at 6 h and 14 h, then stored at -80°C prior to analysis. The concentration of IFN-β was measured using a human IFN-β ELISA kit (PBL Assay Science, Piscataway, NJ).
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9

Investigating IFN-mediated Immune Responses

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Poly(I:C) (Invitrogen, Carlsbad, CA, USA), IFN-γ (Peprotech, Rocky Hill, NJ, USA), IFN-α (Peprotech), TRIzol Reagent (Takara, Dalian, China), Gamma Bind G Plus-Sepharose (Amersham Biosciences, GE Healthcare, Marlborough, MA, USA) and the human IFN-β ELISA kit (PBL, Piscataway, NJ, USA) were purchased from the indicated manufacturers. HEK293 and HeLa cells were obtained from the ATCC. Mouse anti-Flag (Sigma, St Louis, MO, USA), mouse anti-β-actin (Sigma), mouse anti-GFP (Santa Cruz Biotechnology, Santa Cruz, CA, USA), mouse anti-LMNB1 (Proteintech, Rosemont, IL, USA), rabbit anti-IRF3 (Santa Cruz Biotechnology), rabbit anti-pIRF3 (CST, Danfoss, MA, USA), rabbit anti-VISA (Bethyl, Montgomery, TX, USA), rabbit anti-TBK1 (Abcam, Cambridge, UK), rabbit anti-pTBK1 (Abcam) and rabbit anti-LC3 (Sigma) antibodies were purchased from the indicated manufacturers. Rabbit and mouse antibodies against IFITM3 were raised against recombinant human IFITM3.
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10

STING Agonist Activation Assays

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All STING reporter cell assays were conducted according to manufacturer’s protocols. In short, CDN or control agonists were added at desired concentrations in 20 µL PBS to desired wells of flat-bottom 96-well plates. HEK-Blue, J774-Dual, THP-1 Dual, or THP-1 parental cell lines were harvested, washed, counted, and resuspended for addition of 5×104 – 1×105 cells per well in 180 µL recommended media. Cells were incubated with CDN for 20–24 hours, when supernatants were harvested for Luciferase or SEAP assays using QuantiLuc or QuantiBlue solutions according to manufacturer’s instructions. For ELISA, THP-1 parental cells were incubated with CDN for 72 hours, then supernatants were harvested, and IFNβ levels were quantified using the PBL Human IFNβ ELISA kit according to manufacturer’s protocols.
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