Surface analysis by bacterial adherence to virus-infected cells

Area of Science:

• Immunology
• Virology
• Cell Biology
• Diagnostic Medicine

Background:

• Accurate detection of cell surface antigens is crucial for understanding viral infections and developing diagnostics.
• Existing methods for cell surface antigen analysis can be complex, time-consuming, or expensive.
• Vesicular stomatitis virus (VSV) serves as a model system for studying viral-host interactions.

Purpose of the Study:

• To develop a rapid, inexpensive, and sensitive assay for detecting antigens on the surface of whole eukaryotic cells.
• To utilize Staphylococcus aureus for specific tagging of antigen-antibody complexes at the cell surface.
• To identify which specific viral antigen on the cell surface mediates bacterial adherence using VSV mutants.

Main Methods:

• Development of a novel assay involving specific tagging of antigen-antibody complexes with Staphylococcus aureus.
• Infection of eukaryotic cells with vesicular stomatitis virus (VSV).
• Exposure of infected cells to specific antiserum, followed by Staphylococcus aureus, and subsequent microscopic examination.
• Utilizing temperature-sensitive VSV mutants (ts G41 and ts 045) to differentiate between viral antigens.

Main Results:

• The developed assay achieved nearly 100% positive reaction rates in infected cells.
• Bacterial adherence assay specifically detected the viral glycoprotein at the cell surface.
• Internal viral antigens and adsorbed extracellular virions did not trigger bacterial adherence.
• The assay accurately distinguished between different viral components.

Conclusions:

• A rapid and cost-effective assay for detecting cell surface antigens, specifically viral glycoproteins, has been established.
• The assay demonstrates high sensitivity and specificity, relying on bacterial adherence mediated by antigen-antibody complexes.
• This method holds significant potential for applications in diagnostic medicine and advanced cell surface analyses.