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Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production
08:32

Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production

Published on: March 2, 2014

High-level replication of human immunodeficiency virus in thymocytes requires NF-kappaB activation through

L Chêne1, M T Nugeyre, F Barré-Sinoussi

  • 1Unité de Biologie des Rétrovirus, Institut Pasteur, 75724 Paris Cedex 15, France.

Journal of Virology
|February 11, 1999
PubMed

Insights

Human immunodeficiency virus type 1 (HIV-1) replication in thymocytes is transcriptionally activated by Rel/NF-kappaB factors. Thymic microenvironment cytokines, including IL-7, are crucial for this HIV-1 activation.

Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • Previous studies showed thymic epithelial cell (TEC) interaction is essential for high-level human immunodeficiency virus type 1 (HIV-1) replication in thymocytes.
  • HIV-1 replication in thymocytes is a critical aspect of viral pathogenesis and persistence.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying HIV-1 replication activation in thymocytes.
  • To investigate the role of Rel/NF-kappaB transcription factors and the thymic microenvironment in HIV-1 replication.

Main Methods:

  • Coculture of thymocytes with TEC.
  • Transfection of HIV-1 provirus with and without kappaB sites.
  • Analysis of NF-kappaB complex formation and activity in thymocyte nuclei.
  • Reporter gene assays using HIV-1 long terminal repeat (LTR).
  • Cytokine stimulation (TNF, IL-1, IL-7) and assessment of NF-kappaB activation.

Main Results:

  • HIV-1 replication in thymocytes requires functional kappaB sites in the provirus.
  • NF-kappaB complexes, particularly p50-p65, are constitutively present in thymocyte nuclei.
  • NF-kappaB activity directly correlates with HIV-1 LTR transactivation.
  • Tumor necrosis factor (TNF) and interleukin-1 (IL-1) induce NF-kappaB activity and LTR transactivation.
  • Interleukin-7 (IL-7), secreted by TEC, is essential for TNF/IL-1-induced NF-kappaB activation.

Conclusions:

  • HIV-1 replication in thymocytes is primarily regulated at the transcriptional level via Rel/NF-kappaB activation.
  • The thymic microenvironment, through cytokines like TNF, IL-1, and IL-7, specifically modulates NF-kappaB activity to enhance HIV-1 replication.
  • Understanding these interactions is key to developing strategies against HIV-1 persistence in the thymus.

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