An electron microscopic study of changes at the surface of influenza-infected cells as revealed by ferritin-conjugated antibodies

Area of Science:

• Virology
• Cell Biology
• Immunology

Background:

• Influenza virus replication involves assembly and release from host cells.
• Understanding the virus-host interaction at the cell surface is crucial for viral pathogenesis studies.

Purpose of the Study:

• To elucidate the sequence of events during the release of the PR8 strain of influenza virus from chorioallantoic membranes (CAM).
• To determine if host cell proteins are incorporated into the structure of newly formed influenza virions.

Main Methods:

• Utilized ferritin-conjugated antibodies specific for viral V antigen and host cell antigen.
• Employed infectivity titrations and electron microscopy to detect viral progeny.
• Observed viral antigen accumulation and host cell antigen changes at the cell surface.

Main Results:

• Viral progeny were detected 12-13 hours post-infection at a low input multiplicity.
• Progressive accumulation of viral antigen was observed at the cell surface.
• A decrease in host cell antigen amount was noted as infection advanced.

Conclusions:

• Normal host cell proteins are not an integral part of the influenza virus surface structure.
• The study provides insights into the mechanism of influenza virus liberation from infected cells.