Pseudorabies Virus Inhibits Expression of Liver X Receptors to Assist Viral Infection

Area of Science:

• Virology
• Molecular Biology
• Biochemistry

Background:

• Pseudorabies virus (PRV) causes significant economic losses globally.
• Liver X Receptors (LXRs) are key regulators of lipid homeostasis.
• The role of LXRs in PRV infection remains unclear.

Purpose of the Study:

• To investigate the interaction between PRV infection and LXR signaling.
• To determine the effect of LXR modulation on PRV proliferation.
• To elucidate the mechanism by which LXRs influence PRV entry.

Main Methods:

• Quantitative real-time PCR and Western blotting to assess LXRα and LXRβ expression.
• In vitro and in vivo experiments to evaluate PRV proliferation under LXR activation/inhibition.
• Cholesterol level measurements and live-cell imaging to analyze clathrin-coated pit dynamics.
• In vivo antiviral efficacy study using an LXR agonist (T0901317) in mice.

Main Results:

• PRV infection downregulated LXRα and LXRβ expression both in vitro and in vivo.
• LXR activation suppressed PRV proliferation, whereas LXR inhibition enhanced it.
• LXR activation reduced cellular cholesterol, affecting clathrin-coated pit dynamics and PRV entry.
• Cholesterol replenishment reversed the effects of LXR activation on viral entry.
• T0901317 treatment protected mice against PRV infection.

Conclusions:

• PRV infection modulates LXR expression and function.
• LXR signaling plays a crucial role in controlling PRV proliferation.
• PRV utilizes LXR-mediated cholesterol metabolism to facilitate viral entry and replication.
• Targeting LXR pathways represents a potential therapeutic strategy against PRV.