An Assay to Measure the Neutralizing Antibody Titer Specific for Respiratory Syncytial Virus
Published: March 29, 2024
Abstract
Source: Do, L. A. H., et al., An Improved and High Throughput Respiratory Syncytial Virus (RSV) Micro-neutralization Assay. J. Vis. Exp. (2019)
This video demonstrates an assay for measuring neutralizing antibodies against respiratory syncytial virus (RSV). Pre-incubation with serum containing RSV-neutralizing antibodies neutralizes the virus particles, reducing cellular infection and plaque formation. Virus-infected cells are then subjected to fixation, blocking, and fluorophore-conjugated antibody labeling for plaque visualization. This process enables the identification of the highest serum dilution that neutralizes fifty percent of RSV, representing the neutralization titer.
Protocol
All procedures involving sample collection have been performed in accordance with the institute's IRB guidelines. NOTE: All steps must be performed in a BSL2 hood unless stated differently. Viral titration is required before a plaque-reduction neutralization (PRN) assay to determine the optimal RSV concentration used in the PRN assay. It is recommended to aliquot the virus stocks in a small volume that will be thawed once and used for each NAb assay. …
Representative Results
Figure 1: Viral titration plate layout for quantitation of RSV stocks. v = stock of RSV virus (v1, stock of viral batch 1; v2, stock of viral batch 2; v3, stock of viral batch 3), N = negative control well, X = media added. Color coding is only to aid in the visualization of plate layout. <img alt="Figure 2" src="/files/ftp_upload/…
Declarações
The authors have nothing to disclose.
Materials
| Cell line | |||
| A549 | ATCC | CCL-185 | provided by Dr Keith Chappell, University of Queensland |
| Viral strains | |||
| RSV A2 | ATCC | VR-1540 | lot number 60430286 |
| Reagents | |||
| Acetone | Merck | 1000142511 | |
| Alexa-Fluor donkey anti-goat IgG (stored at 4 °C) | Life Technologies | A11055 | |
| CMC sodium salt powder | Sigma-Aldrich | C5678-500G | |
| DMEM (no serum, 3.7 g/L NaHC, P/S) (stored at 4 °C) | Scientific Services – Tissue Culture | MCRI in house supply | |
| Foetal calf Serum (stored in 50ml aliquots at -20 °C) | Interpath | SFBS-F | |
| Goat X RSV antibody | Merck | AB1128 | |
| Human polyclonal antiserum to respiratory syncytial virus (RSV) (stored in 45 µL aliquots at -20 °C) | BEI Resources | NR-4022 | Free order through BEI Resources upon registration. This serum belong to a panel of human antiserum and immune globulin to RSV (NR-32832) |
| M199 powder | Life Technologies | 31100035 | |
| Milk diluent blocking solution (stored at 4 °C) | Australian Biosearch | 50-82-01 | |
| Penicillin/Streptomycin (stored in 6mL aliquots at -20 °C) | Life Technologies | 15140122 | |
| s.d.H2O from Milli-Q dispenser | Merck | In-house dispensation | |
| Sterile 1X PBS for culture (stored at 4°C) | Scientific Services – Tissue Culture | MCRI in house supply | |
| Tween 20 polysorbate | Sigma-Aldrich | 9005-64-5 | |
| General Consumables | |||
| Conical Falcon tubes (50 mL) | Invitro Technologies | FAL352070 | |
| Filter unit 0.22um (500 mL) | Thermo Fisher | NAL5660020 | |
| Sterile Eppendorf tubes (1.5 mL) | Australia PL | AM12400 | |
| Sterile flat-bottom plates (96-well with lid) | Interpath | 655180 | |
| Sterile U-bottom plates (96-well with lid) | Interpath | 650180 | |
| 5ml serological pipette | Sigma-Aldrich | CLS4487-200EA | |
| 10 mL serological pipette | Interpath | 607180 | |
| 25 mL serological pipette | Sigma-Aldrich | CLS4251-200EA | |
| Tip Pipette 1-200 µL Clear Maxymum Recovery Racked Pre-sterilized 10RACKS x 96TIPS PKG960 | Fisher Biotec | TF-200-L-R-S | |
| Tip Pipette 5-20 µL Clear Maxymum Recovery Racked Pre-sterilized 10RACKS x 96TIPS PKG960 | Fisher Biotec | TF-20-L-R-S | |
| Tip Pipette 100-1000 µLClear Maxymum Recovery Racked Pre-sterilized 10RACKS x 100TIPS PKG1000 | Fisher Biotec | TF-1000-L-R-S | |
| Tip Pipette 1-10 µL Clear Maxymum Recovery Racked Pre-sterilized 10RACKS x 100TIPS PKG1001 | Fisher Biotec | TXLF-10-L-R-S | |
| Equipments and softwares | |||
| ELISpot reader system | AID iSpot, Autoimmun Diagnostika GmbH, Strasburg, Germany | ||
| AID ELISpot software version 5.0 | AID iSpot, Autoimmun Diagnostika GmbH, Strasburg, Germany | ||
| Microsoft Excel 2007 |
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Citar este artigo
An Assay to Measure the Neutralizing Antibody Titer Specific for Respiratory Syncytial Virus. J. Vis. Exp. (Pending Publication), e22097, doi: (2024).