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LPS reduces HIV-1 replication in primary human macrophages partly through an endogenous production of type I

Sébastien Simard1, Emilie Maurais, Caroline Gilbert

  • 1Centre de Recherche en Infectiologie, Centre Hospitalier de l'Université Laval, Département de biologie médicale, Faculté de médecine, Université Laval, Québec, Canada.

Clinical Immunology (Orlando, Fla.)
|February 26, 2008
PubMed

Insights

Lipopolysaccharide (LPS) differentially affects HIV-1 replication in myeloid cells. While LPS boosts HIV-1 gene expression in monocytic cells, it inhibits replication in macrophages via type I interferons.

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Systemic immune activation in HIV-1 infection may stem from microbial products like lipopolysaccharide (LPS).
  • Macrophages are crucial in HIV-1 pathogenesis, making their response to immune stimuli significant.

Purpose of the Study:

  • To investigate the impact of LPS on HIV-1 replication in myeloid lineage cells.
  • To elucidate the mechanisms behind LPS-mediated effects on HIV-1 in macrophages.

Main Methods:

  • Utilized a monocytic cell line and primary human monocyte-derived macrophages (MDM).
  • Assessed HIV-1 gene expression and production following LPS treatment.
  • Investigated NF-kappaB activation and the role of type I interferons (IFN) using B18R neutralization.

Main Results:

  • LPS promoted HIV-1 gene expression in a monocytic cell line.
  • LPS diminished HIV-1 production in primary human MDM, despite activating NF-kappaB.
  • Neutralization of type I IFN partially reversed LPS's antiviral effect in MDM.

Conclusions:

  • LPS exhibits distinct effects on HIV-1 replication depending on the myeloid cell type.
  • The antiviral activity of LPS in MDM is mediated by induced type I interferons and another unidentified soluble factor.
  • Understanding these differential responses is key to managing HIV-1 pathogenesis.

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