Rapid quantitation of interferon with chronically oncornavirus-producing cells

Area of Science:

• Virology
• Immunology
• Biotechnology

Background:

• Interferon (IFN) is crucial for antiviral defense.
• Quantifying interferon activity typically requires exogenous viral challenges.
• Oncornaviruses provide a model for endogenous viral production in cell cultures.

Purpose of the Study:

• To develop a simple interferon quantitation system.
• To create an assay independent of exogenous viral infection.
• To establish a sensitive and reproducible method for interferon measurement.

Main Methods:

• Utilized cells chronically infected with oncornavirus.
• Quantified interferon's inhibitory effect on endogenous virus production.
• Measured viral release via reverse transcriptase activity.
• Determined interferon's dose-dependent inhibition.

Main Results:

• Developed a novel interferon assay based on oncornavirus-infected cells.
• Interferon's inhibitory effect showed a linear relationship with the log of dilution (5-80% inhibition).
• Assay sensitivity was comparable to the vesicular stomatitis virus plaque reduction assay.
• Demonstrated superior reproducibility compared to existing methods.
• The assay is rapid, completed within 24 hours.

Conclusions:

• A simple, rapid, and reproducible interferon quantitation system was established.
• This method, relying on endogenous oncornavirus production, bypasses the need for exogenous viral infections.
• The assay offers a sensitive and reliable alternative for interferon measurement in research and diagnostics.