Syndecan-4, a PRRSV attachment factor, mediates PRRSV entry through its interaction with EGFR

Area of Science:

• Virology
• Cell Biology
• Biochemistry

Background:

• Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) causes significant economic losses in the swine industry.
• Understanding PRRSV entry mechanisms is vital for developing effective control strategies.
• Host factors mediating PRRSV cell entry remain largely unidentified.

Purpose of the Study:

• To investigate host factors involved in PRRSV cell entry.
• To elucidate the role of syndecan-4 in PRRSV attachment and entry.
• To explore the interaction between syndecan-4 and Epidermal Growth Factor Receptor (EGFR) during PRRSV infection.

Main Methods:

• Utilized MACR-145 cells for PRRSV infection studies.
• Investigated the role of syndecan-4 using specific peptides and inhibitors.
• Assessed the interaction between syndecan-4 and EGFR.
• Monitored PRRSV entry and syndecan-4 endocytosis.

Main Results:

• Syndecan-4, a heparan sulfate proteoglycan, was identified as a critical factor for PRRSV attachment and entry.
• EGFR was found to interact with syndecan-4 in MACR-145 cells, and disrupting this interaction inhibited PRRSV entry.
• Inhibition of EGFR or syndecan-4 function impaired PRRSV-induced syndecan-4 endocytosis.

Conclusions:

• Syndecan-4 acts as a PRRSV attachment factor, mediating viral entry.
• The interaction between syndecan-4 and EGFR is essential for efficient PRRSV cell entry.
• Targeting the syndecan-4/EGFR pathway may offer a novel strategy to block PRRSV infection.