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HIV Nef increases T cell ERK MAP kinase activity.

Jeffrey A Schrager1, Violette Der Minassian, Jon W Marsh

  • 1Laboratory of Molecular Biology, National Institute of Mental Health, National Institutes of Health, Bethesda, Maryland 20892-4034, USA.

The Journal of Biological Chemistry
|December 1, 2001
PubMed
Summary

The human immunodeficiency virus protein Nef enhances viral replication by activating the extracellular signal-regulated kinase (ERK) pathway in CD4 T cells. This activation, dependent on T cell receptor stimulation, impacts viral pathogenesis and infectivity.

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Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • The human immunodeficiency virus (HIV) regulatory protein Nef is crucial for viral replication and pathogenesis.
  • Nef's precise biochemical functions within T cells, despite its known interactions and T cell activation capabilities, are not fully understood.

Purpose of the Study:

  • To investigate the bioactivity of Nef in primary CD4 T cells.
  • To elucidate the specific biochemical pathways influenced by Nef in T cells, focusing on those critical for T cell function.

Main Methods:

  • Examination of Nef's effects on primary CD4 T cells.
  • Analysis of the extracellular signal-regulated kinase (ERK) mitogen-activated protein (MAP) kinase pathway.
  • Assessment of Nef's impact in conjunction with T cell receptor stimulation.

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Main Results:

  • Nef expression significantly increased the activity of the ERK MAP kinase pathway, including ERK, MEK, and Elk induction.
  • The enhancement of MAP kinase pathway activity by Nef was contingent upon T cell receptor stimulation.
  • Nef's role in increasing ERK MAP kinase activity links it to key cellular processes affecting T cell function and viral spread.

Conclusions:

  • Nef directly modulates the ERK MAP kinase pathway in CD4 T cells.
  • This modulation is dependent on T cell activation signals, suggesting a coordinated role in HIV pathogenesis.
  • Nef's influence on the ERK pathway provides a biochemical mechanism contributing to enhanced viral replication and infectivity.