Partial purification and characterization of RTG-2 fish cell interferon

Area of Science:

• Virology
• Immunology
• Cell Biology

Background:

• Interferons are crucial antiviral proteins in vertebrates.
• Understanding fish interferons is vital for aquaculture health.
• Rainbow trout gonadal (RTG-2) cells are a model for fish cell interferon production.

Purpose of the Study:

• To partially purify and characterize in vitro produced fish cell interferon from RTG-2 cells.
• To investigate the physical, chemical, and biological properties of RTG-2 interferon.
• To assess the antiviral activity and species specificity of purified RTG-2 interferon.

Main Methods:

• Partial purification using ultracentrifugation, gel chromatography, ion exchange chromatography, and electrophoresis.
• Isoelectric point determination via CM-Sephadex (C-50) chromatography.
• Molecular weight estimation using Sephadex G-150 filtration.
• Enzymatic and stability assays (heat, pH, trypsin, 2-mercaptoethanol, DNase, RNase).
• Antiviral activity testing against specific fish viruses.

Main Results:

• RTG-2 interferon has an isoelectric point of 7.1 and a molecular weight of 94,000.
• The interferon is non-dialyzable, heat- and pH-stable, but inactivated by trypsin and 2-mercaptoethanol.
• It is resistant to DNase and RNase treatment.
• Partially purified RTG-2 interferon shows antiviral activity against infectious pancreatic necrosis virus and infectious hematopoietic necrosis virus.
• Partially purified interferon exhibits enhanced species specificity compared to crude material.

Conclusions:

• Partial purification and characterization of RTG-2 interferon were successfully achieved.
• The studied properties are consistent with known interferon characteristics.
• RTG-2 interferon possesses significant antiviral activity and potential for species-specific applications in fish health.