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An In vitro Model to Study Immune Responses of Human Peripheral Blood Mononuclear Cells to Human Respiratory Syncytial Virus Infection
Published on: December 11, 2013
Antigenic characterization of respiratory syncytial virus strains with monoclonal antibodies
Abstract:
To study the antigenic characteristics of respiratory syncytial virus (RSV), we developed and evaluated monoclonal antibodies (MAbs) to three strains of RSV: 11 to Long, 4 to 18537, and 9 to A2. Six of these MAbs immunoprecipitated the nucleoprotein, six the large glycoprotein, and 11 the fusion protein. By the pattern of the reactions of these MAbs to 16 strains of RSV in an indirect immunofluorescence assay or enzyme-linked immunosorbent assay, we were able to distinguish three subgroups. With a panel of 10 of these 24 MAbs, we tested 26 strains isolated between 1979 and 1982 in Boston and found that 22 belonged to group 1, 4 to group 2, and none to group 3. The pattern of the reactions of the MAbs against representative strains from the three groups identified nine epitopes by indirect immunofluorescence assay: three of each on the nucleoprotein, the large glycoprotein, and the fusion protein. These results, along with those of previous studies, suggest that groups 1 and 3 are antigenically similar and group 2 is antigenically more distinct.
Insights
Researchers developed monoclonal antibodies to study respiratory syncytial virus (RSV) strains, identifying three antigenic subgroups. Most RSV strains analyzed belonged to group 1, suggesting distinct antigenic profiles within RSV.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Respiratory syncytial virus (RSV) is a major cause of respiratory illness.
- Understanding RSV antigenic diversity is crucial for vaccine development and diagnostics.
Purpose of the Study:
- To characterize the antigenic properties of different respiratory syncytial virus (RSV) strains.
- To develop and utilize monoclonal antibodies (MAbs) for RSV strain differentiation.
Main Methods:
- Development and evaluation of 24 MAbs against three RSV strains (Long, 18537, A2).
- Immunoprecipitation assays to identify MAb targets (nucleoprotein, large glycoprotein, fusion protein).
- Indirect immunofluorescence assay (IIF) and enzyme-linked immunosorbent assay (ELISA) to analyze MAb reactivity against 16 RSV strains.
Main Results:
- Six MAbs targeted the nucleoprotein, six the large glycoprotein, and 11 the fusion protein.
- MAbs distinguished three antigenic subgroups of RSV.
- Analysis of 26 RSV strains isolated in Boston (1979-1982) revealed 22 in group 1 and 4 in group 2.
- Nine distinct epitopes were identified on RSV proteins (nucleoprotein, large glycoprotein, fusion protein).
Conclusions:
- RSV strains can be classified into at least three antigenic subgroups based on MAb reactivity.
- Antigenic group 2 appears more distinct compared to antigenically similar groups 1 and 3.
- Monoclonal antibodies are valuable tools for dissecting RSV antigenic diversity.
