Receptor destruction by viruses of the mumps-NDV-influenza group

Area of Science:

• Virology
• Immunology
• Biochemistry

Background:

• Viruses utilize host cell receptors for attachment and entry.
• Inhibitors in biological fluids can neutralize viral activity.
• Understanding virus-receptor interactions is crucial for antiviral strategies.

Purpose of the Study:

• To investigate the receptor-removing capabilities of mumps, Newcastle disease virus (NDV), and influenza virus strains on fowl red cells.
• To assess the capacity of these virus strains to inactivate hemagglutinin inhibitors present in human plasma and egg white.
• To characterize the inhibitor gradients and compare them with receptor gradients.

Main Methods:

• Testing of mumps, NDV, and influenza virus strains for receptor removal from fowl red blood cells.
• Assaying the ability of five virus strains to inactivate hemagglutinin inhibitors in human plasma and egg white.
• Determining the inhibitor gradient by observing the sequence of inhibitor destruction by different virus strains.
• Comparing inhibitor gradients with receptor gradients.

Main Results:

• Mumps, NDV, and influenza viruses effectively removed receptors from fowl red cells.
• All tested virus strains, including mumps and NDV, completely inactivated egg white inhibitors.
• Influenza strains fully inactivated plasma inhibitors, while mumps and NDV partially inactivated them, affecting only mumps inhibition.
• Distinct inhibitor gradients were observed for egg white and plasma, differing significantly from the receptor gradient.

Conclusions:

• Avian viruses possess potent receptor-destroying and hemagglutinin inhibitor-inactivating properties.
• The interaction of viruses with inhibitors in plasma and egg white differs, suggesting distinct mechanisms or inhibitor components.
• The observed gradients highlight specific virus-host-inhibitor interactions relevant to viral pathogenesis and host defense.