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Disorders of the JAK/STAT Pathway in T Cell Lymphoma Pathogenesis: Implications for Immunotherapy

Thomas A Waldmann1, Jing Chen1

  • 1Lymphoid Malignancies Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892;

Annual Review of Immunology
|February 10, 2017
PubMed

Insights

Abnormal Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway activation drives T cell malignancies. Targeting this pathway, including cytokine receptors and JAK kinase inhibitors, offers promising new therapeutic strategies.

Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • Common gamma receptor-dependent cytokines and their associated Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathways are crucial for T cell immunity.
  • Aberrant activation of the JAK/STAT pathway, indicated by pSTAT3/pSTAT5 phosphorylation, is prevalent in various T cell malignancies.

Purpose of the Study:

  • To investigate the role of the JAK/STAT pathway in T cell malignancies.
  • To explore the potential of targeting this pathway for therapeutic interventions.

Main Methods:

  • Analysis of pSTAT3/pSTAT5 phosphorylation in T cell malignancies.
  • Assessment of the requirement for JAK1 and STAT3 in T cell line proliferation and survival.
  • Evaluation of the effects of JAK kinase inhibitors on leukemic T cell line proliferation.

Main Results:

  • JAK1 and STAT3 are essential for the proliferation and survival of T cell lines, irrespective of mutations in JAKs or STATs.
  • Activating JAK and STAT mutations alone are insufficient to initiate leukemic proliferation; they augment upstream cytokine pathway signals.
  • Full pathway activation, including cytokine receptors, is necessary for JAK/STAT signaling.
  • JAK kinase inhibitors demonstrated efficacy in reducing leukemic T cell line proliferation.

Conclusions:

  • The JAK/STAT pathway is constitutively activated in T cell malignancies.
  • Therapeutic strategies targeting common gamma cytokines, cytokine-receptor interactions, and JAK kinase inhibitors hold significant promise for treating T cell malignancies.
Keywords:
JAK/STATT cell lymphomaγc cytokines

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