Chicken Heat Shock Protein 70 Is an Essential Host Protein for Infectious Bursal Disease Virus Infection In Vitro

Area of Science:

• Virology
• Immunology
• Molecular Biology

Background:

• Infectious bursal disease virus (IBDV) causes significant economic losses in the poultry industry.
• Understanding host-virus interactions is crucial for managing viral pathogenicity.
• Heat shock protein 70 (Hsp70) is a conserved host factor implicated in various viral infections, but its role in IBDV is unclear.

Purpose of the Study:

• To investigate the role of chicken heat shock protein 70 (cHsp70) in IBDV infection.
• To elucidate the interaction between cHsp70 and IBDV components.
• To assess the potential of cHsp70 as an antiviral target.

Main Methods:

• Monitoring cHsp70 expression in IBDV-infected DF-1 cells.
• Immunofluorescence assays to determine co-localization of cHsp70 and viral dsRNA.
• Pull-down assays to identify direct interactions between cHsp70 and viral proteins (vp2, vp3).
• Overexpression and siRNA-mediated knockdown of cHsp70 to evaluate its effect on viral production.

Main Results:

• cHsp70 expression increased during IBDV infection in DF-1 cells.
• cHsp70 was found to co-localize with viral dsRNA and directly interact with dsRNA, vp2, and vp3.
• Overexpression of cHsp70 enhanced IBDV production, while its knockdown reduced viral yield.
• These findings indicate cHsp70's involvement in the IBDV replication and transcription complex.

Conclusions:

• cHsp70 is essential for IBDV replication in chicken DF-1 cells.
• cHsp70 plays a critical role in supporting the viral life cycle.
• Targeting cHsp70 presents a potential antiviral strategy for controlling IBDV infections.