A functional henipavirus envelope glycoprotein pseudotyped lentivirus assay system

Area of Science:

• Virology
• Molecular Biology
• Immunology

Background:

• Hendra virus (HeV) and Nipah virus (NiV) are highly pathogenic zoonotic viruses causing severe disease in humans and animals.
• Outbreaks of these henipaviruses continue to occur, necessitating research into their infection mechanisms.
• Studying HeV and NiV is challenging due to their BSL-4 containment requirements.

Purpose of the Study:

• To develop a safe and effective assay for studying henipavirus entry.
• To investigate the roles of HeV and NiV fusion (F) and attachment (G) glycoproteins in viral entry.
• To facilitate research on henipavirus neutralization and entry inhibition.

Main Methods:

• Development of a lentivirus pseudotyping system using HeV and NiV F and G glycoproteins.
• Utilizing reporter genes (luciferase or GFP) for detecting viral entry.
• Testing the assay's specificity and functionality using receptor dependency and blocking agents.

Main Results:

• Functional henipavirus pseudotyped retroviruses demonstrated target cell tropism dependent on ephrinB2/B3 receptors.
• Assay specificity confirmed by single-glycoprotein particle experiments.
• Virus entry was successfully blocked by HR-2 peptide, an anti-G glycoprotein antibody, and soluble receptors.

Conclusions:

• A novel henipavirus entry assay using pseudotyped reporter virus particles has been established.
• This assay can be safely performed under BSL-2 conditions.
• The assay is valuable for studying henipavirus entry, glycoprotein function, and characterizing neutralizing agents.