Specific inhibition of XC syncytia formation by anti-MuLV gp69/71 antibodies

Area of Science:

• Virology
• Immunology
• Molecular Biology

Background:

• Ecotropic murine leukemia virus (MuLV) causes XC syncytia formation upon co-cultivation with XC cells.
• The major envelope glycoprotein (gp69/71) of MuLV is implicated in viral fusion and cell-to-cell spread.

Purpose of the Study:

• To investigate the role of MuLV gp69/71 in XC syncytia formation.
• To develop a method for typing ecotropic type C viruses and detecting anti-gp69/71 antibodies.

Main Methods:

• Co-cultivation of MuLV producer cells with XC cells.
• Inhibition assays using type- and group-specific anti-MuLV gp69/71 antibodies.
• Development of a micromethod for antibody detection.

Main Results:

• Anti-MuLV gp69/71 antibodies specifically inhibited XC syncytia formation.
• The inhibition was dependent on the type- and group-specific activity of the antibodies.
• The developed micromethod successfully detected type-specific anti-GLV gp69/71 natural antibodies in normal mouse serum.

Conclusions:

• The major glycoprotein (gp69/71) of budding MuLV is likely responsible for fusion with XC cells.
• Anti-gp69/71 antibody-mediated inhibition provides a specific, sensitive, and convenient method for typing ecotropic type C viruses.
• This assay is effective for detecting natural antibodies against MuLV gp69/71 in mouse populations.