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HTLV-I-induced T-cell activation

G J Buckle1, D A Hafler, P Höllsberg

  • 1Laboratory of Molecular Immunology, Brigham and Women's Hospital, Boston, Massachusetts, USA.

Journal of Acquired Immune Deficiency Syndromes and Human Retrovirology : Official Publication of the International Retrovirology Association
|January 1, 1996
PubMed
Summary

Human T-cell lymphotropic virus type I (HTLV-I) activates T cells through two pathways: direct activation of infected cells and indirect activation of uninfected cells via cell-cell interactions. These mechanisms contribute to HTLV-I pathogenesis.

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Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Human T-cell lymphotropic virus type I (HTLV-I) infection is linked to T-cell activation and associated diseases.
  • Understanding the mechanisms of HTLV-I-induced T-cell activation is crucial for disease intervention.

Purpose of the Study:

  • To elucidate the distinct mechanisms by which HTLV-I induces T-cell activation.
  • To investigate the pathways involved in HTLV-I-mediated T-cell stimulation.

Main Methods:

  • Analysis of in vivo infected nonimmortalized T-cell clones.
  • Assessment of drug inhibition (rapamycin, FK506, cyclosporin A) on T-cell activation.
  • Investigation of T-cell interaction pathways (IL-2R, CD28, LFA-3-CD2).

Main Results:

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  • HTLV-I directly activates infected T cells via pathways resembling hyperactive IL-2R or CD28 signaling, inhibited by rapamycin.
  • HTLV-I-infected T cells activate uninfected T cells through LFA-3-CD2 interactions, potentially inducing IL-2 production.
  • These mechanisms may contribute to HTLV-I pathogenesis and diseases like HTLV-I-associated myelopathy/tropical spastic paraparesis.

Conclusions:

  • HTLV-I employs dual mechanisms for T-cell activation: direct stimulation of infected cells and indirect activation of bystander cells.
  • These pathways offer potential therapeutic targets for HTLV-I-associated conditions.