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Xiaodong Zou1, Feng Lin1, Yang Yang1

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Classical swine fever virus (CSFV) hijacks host cell cholesterol metabolism, increasing levels and disrupting immune responses. This study reveals CSFV

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Area of Science:

  • Virology
  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Classical swine fever (CSF) causes significant global economic losses in the swine industry.
  • Lipid synthesis is crucial for viral replication, protein maturation, and envelope production.
  • The precise interaction between CSFV and host lipid metabolism remains largely unexplored.

Purpose of the Study:

  • To investigate the specific crosstalk between CSFV and host cell lipid metabolism.
  • To elucidate the mechanisms by which CSFV affects cholesterol homeostasis.
  • To understand the impact of CSFV-induced metabolic changes on the host immune response.

Main Methods:

  • Utilized PK-15 cells as a model system for CSFV infection.
  • Quantified intracellular cholesterol levels following CSFV infection.
  • Analyzed the expression of genes involved in cholesterol uptake and biosynthesis (PCSK9, LDLR).
  • Assessed the effect of CSFV infection on the type I interferon (IFN) response.

Main Results:

  • CSFV infection led to increased intracellular cholesterol levels in PK-15 cells.
  • CSFV upregulated PCSK9 expression, inhibiting low-density lipoprotein receptor (LDLR)-mediated cholesterol uptake.
  • The virus also enhanced the host cell's cholesterol biosynthesis pathway.
  • These metabolic disruptions impaired the type I IFN response in infected cells.

Conclusions:

  • CSFV manipulates host cell cholesterol metabolism to its advantage.
  • Upregulation of PCSK9 and enhanced cholesterol biosynthesis are key mechanisms employed by CSFV.
  • Disruption of the type I IFN response contributes to CSFV pathogenesis.
  • Targeting host lipid metabolism presents a potential strategy for controlling CSFV.