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Related Experiment Videos

T cell activation modulates retrovirus-mediated gene expression

E R Quinn1, L G Lum, K T Trevor

  • 1Vince Lombardi Gene Therapy Laboratory, Immunotherapy, Research and Treatment Institute, St. Luke's Medical Center, Milwaukee, WI 53201, USA.

Human Gene Therapy
|July 29, 1998
PubMed
Summary

Efficient gene therapy in human T cells requires understanding gene delivery and expression. This study shows T cell activation via anti-CD3/anti-CD28 beads enhances early retroviral gene expression, which declines without T cell signaling.

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Area of Science:

  • Immunology
  • Gene Therapy
  • Molecular Biology

Background:

  • Efficient gene delivery and expression in primary human T cells are critical for T lymphocyte-based gene therapy.
  • Retrovirus-mediated gene transfer is a common method for introducing genetic material into T cells.

Purpose of the Study:

  • To evaluate retrovirus-mediated gene transfer and proviral gene expression in human T cells activated by different methods.
  • To investigate the impact of T cell activation signaling on the regulation of proviral gene expression.

Main Methods:

  • Human T cells were activated using immobilized anti-CD3 monoclonal antibody (MAb) plus interleukin 2, or cis costimulation with anti-CD3/anti-CD28 MAbs on beads.
  • A modified human interleukin 1beta (IL-1beta) cDNA was inserted into the MFG retroviral vector as an indicator gene.

Related Experiment Videos

  • Retroviral transduction frequencies and proviral gene expression (RNA and protein levels) were analyzed.

    • Main Results:

    • Retroviral transduction frequencies were similar between the two activation methods.
    • T cells activated with anti-CD3/anti-CD28 beads showed greater early proviral gene expression, correlating with enhanced cytokine responses and proliferation.
    • Proviral gene expression decreased in later cultures without T cell signaling but was reinduced upon restimulation.

    Conclusions:

    • T cell activation status significantly influences retroviral gene expression in human T cells.
    • Absence of T cell signaling downmodulates proviral gene expression, a key consideration for clinical gene therapy strategies.
    • Optimized T cell activation protocols may improve the efficacy of retrovirus-mediated gene therapy.