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Signals transduced through the CD4 molecule on T lymphocytes activate NF-kappa B

N Chirmule1, V S Kalyanaraman, S Pahwa

  • 1Department of Pediatrics, North Shore University Hospital-Cornell University Medical College, Manhasset, NY 11030.

Biochemical and Biophysical Research Communications
|August 30, 1994
PubMed

Insights

Native HIV-1 envelope glycoproteins (gp160) activate the NF-kappa B transcription factor via CD4 molecules. This activation involves specific proteins and signaling pathways, potentially influencing HIV replication and immune responses.

Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Human Immunodeficiency Virus type 1 (HIV-1) envelope glycoproteins play critical roles in viral entry and pathogenesis.
  • The transcription factor Nuclear Factor kappa B (NF-kappa B) is a key regulator of immune responses and cellular processes.

Purpose of the Study:

  • To investigate the role of native HIV-1 envelope glycoproteins (gp160) in activating the NF-kappa B transcription factor.
  • To elucidate the cellular mechanisms and pathways involved in gp160-mediated NF-kappa B activation.

Main Methods:

  • Utilized cell-based assays to assess NF-kappa B activation.
  • Employed soluble CD4 to investigate the role of the CD4 receptor.
  • Analyzed the protein composition of the NF-kappa B complex.
  • Investigated the dependence on protein synthesis and tyrosine phosphorylation.
  • Examined the role of protein kinase C inhibitors.

Main Results:

  • Native HIV-1 gp160 induces NF-kappa B activation in a CD4-dependent manner.
  • The activated NF-kappa B complex comprises p65, p50, and c-rel proteins.
  • gp160-induced NF-kappa B activation is independent of protein synthesis but relies on protein tyrosine phosphorylation and protein kinase C signaling.

Conclusions:

  • HIV-1 gp160 activates NF-kappa B in CD4+ T cells through specific molecular pathways.
  • This activation may contribute to various biological effects associated with HIV infection, including enhanced viral replication and immune dysregulation.

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