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Retroviral Transduction of T-cell Receptors in Mouse T-cells
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Retroviral Transduction of T-cell Receptors in Mouse T-cells

Published on: October 22, 2010

Mature T-cell lymphomagenesis induced by retroviral insertional activation of Janus kinase 1

Tim Heinrich1, Benjamin Rengstl, Alexander Muik

  • 1Senckenberg Institute of Pathology, Goethe-University Hospital, Frankfurt am Main, Germany.

Molecular Therapy : the Journal of the American Society of Gene Therapy
|April 24, 2013
PubMed

Insights

Retroviral vectors can cause cancer by integrating into T cells. This study shows oncogenic integration in mature T cells, activating the Janus kinase 1 (Jak1)/STAT3 pathway and leading to lymphoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Therapy

Background:

  • Retroviral vectors (RVs) are utilized in gene therapy but can cause oncogenesis via genomic integration.
  • Previous studies indicated mature T cells are resistant to transformation, unlike oligoclonal T cells.

Purpose of the Study:

  • To investigate retroviral vector-associated insertional mutagenesis in mature T cells.
  • To characterize the mechanism of mature T-cell lymphoma (MTCL) induction by RVs.

Main Methods:

  • Induction of MTCL in TCR-oligoclonal OT-I transgenic T cells using an EGFP-encoding gammaretroviral vector.
  • Integration site analysis to identify proviral insertions.
  • Assessment of Janus kinase 1 (Jak1) and STAT3 pathway activation.
  • Meta-analysis of human T-cell lymphoma/leukemia gene expression data.

Main Results:

  • Successfully induced serially transplantable MTCL in T cells transduced with RVs.
  • Identified a proviral insertion in the Jak1 gene, leading to its overexpression and activation of the Jak/STAT pathway (specifically STAT3).
  • Inhibition of Jak1 significantly impeded tumor growth.
  • Human T-cell lymphomas/leukemias show relevance of Jak/STAT pathway activation.

Conclusions:

  • This study is the first to demonstrate RV-associated insertional mutagenesis in mature T cells.
  • Jak1/STAT3 pathway activation is a key mechanism in RV-induced mature T-cell tumorigenesis.
  • Findings highlight potential risks of RVs in gene therapy and relevance to human T-cell malignancies.

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