Postabsorption neutralization of poliovirus

Area of Science:

• Virology
• Immunology

Background:

• Poliovirus type 1 neutralization by monoclonal antibodies is crucial for understanding viral entry and immune evasion.
• Antigenic sites on the poliovirus virion play a key role in antibody recognition and neutralization.

Purpose of the Study:

• To evaluate the neutralizing capacity of nineteen murine monoclonal antibodies against poliovirus type 1, specifically assessing their activity before and after viral attachment to cells.
• To investigate the mechanism of post-absorption neutralization (PAN) and the role of antibody binding in this process.

Main Methods:

• Testing nineteen neutralizing murine monoclonal antibodies against poliovirus type 1 for neutralization of unattached virus and virus attached to susceptible cells.
• Assessing the ability of Fc-specific rabbit anti-mouse antibodies to confer PAN activity to antibodies lacking it.
• Analyzing the effect of PAN-positive and PAN-negative antibodies on the cell-mediated conversion of poliovirus to 135S and 80S particles.
• Investigating the binding valency of PAN-positive and PAN-negative antibodies to preabsorbed virions and their aggregation potential.

Main Results:

• All nineteen antibodies neutralized unattached poliovirus type 1.
• Six antibodies exhibited significant post-absorption neutralization (PAN) activity.
• Fc-specific antibodies could confer PAN activity to antibodies lacking it.
• PAN activity was associated with the prevention of virus conversion to 135S and 80S particles.
• Evidence suggests bivalent binding for one PAN-positive antibody and monovalent binding for a PAN-negative antibody.
• Only one of two tested PAN-positive antibodies induced virus aggregation in suspension.

Conclusions:

• Monoclonal antibodies against poliovirus type 1 vary in their ability to neutralize the virus after attachment to cells.
• Post-absorption neutralization (PAN) is a distinct mechanism involving the prevention of viral disassembly.
• Antibody binding valency and potential for aggregation may influence neutralization efficacy.