Sensitivity of ortho- and paramyxovirus replication to human interferon alpha

Area of Science:

• Virology
• Immunology

Background:

• Influenza and Newcastle disease viruses pose significant public health threats.
• Interferons are crucial antiviral cytokines.
• Understanding interferon mechanisms against specific viruses is vital.

Purpose of the Study:

• To investigate the antiviral activity of human interferon type alpha (IFN-α) against influenza virus strains and Newcastle disease virus (NDV).
• To elucidate the mechanism of inhibition by IFN-α in Madin Darby bovine kidney (MDBK) cells.

Main Methods:

• Replication of Influenza A/WSN (H0N1), fowl plague (Hav1N1), B-Lee/40, and NDV (Victoria) in MDBK cells.
• Pretreatment of MDBK cells with human IFN-α.
• Assessment of viral cytopathic effect and viral protein synthesis.
• Analysis of viral particle structure and glycosylation.

Main Results:

• Human IFN-α demonstrated high sensitivity in inhibiting the replication of all tested influenza and NDV strains.
• Pretreatment with IFN-α protected MDBK cells from viral cytopathic effects.
• Inhibition of viral replication was mediated by suppressed viral protein synthesis.
• Structural protein patterns and glycosylation of released WSN virus particles were unaffected by IFN-α treatment.

Conclusions:

• Human IFN-α is a potent inhibitor of influenza and NDV replication in MDBK cells.
• The antiviral effect is primarily due to the inhibition of viral protein synthesis.
• IFN-α does not alter the structural integrity or glycosylation of viral components.