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Expression and function of Kv1.3 channel in malignant T cells in Sézary syndrome

Tengpeng Hu1, Terkild Brink Buus1, Thorbjørn Krejsgaard1

  • 1LEO Foundation Skin Immunology Research Center, Department of Immunology and Microbiology, University of Copenhagen, Copenhagen, Denmark.

Oncotarget
|August 27, 2019
PubMed

Insights

Sézary syndrome malignant T cells express functional Kv1.3 channels. Blocking Kv1.3 inhibits their proliferation and IL-9 expression, suggesting Kv1.3 as a therapeutic target for Sézary syndrome.

Area of Science:

  • Immunology
  • Cell Biology
  • Channel Physiology

Background:

  • The voltage-gated potassium channel Kv1.3 (KCNA3) is crucial for the function of chronically activated memory T cells.
  • Sézary syndrome (SS) is a rare type of cutaneous T-cell lymphoma characterized by malignant T cells.

Purpose of the Study:

  • To investigate the expression and functional role of Kv1.3 channels in malignant T cells from Sézary syndrome patients.
  • To evaluate the therapeutic potential of Kv1.3 blockade in Sézary syndrome.

Main Methods:

  • Primary malignant T cells from SS patients were isolated and analyzed for Kv1.3 expression.
  • Cells were treated with Kv1.3 inhibitors (ShK, Vm24, [N17A/F32T]-AnTx) to assess channel function.
  • Proliferation, IL-9 expression, CD25 induction, and apoptosis were measured following Kv1.3 blockade and T-cell activation (CD3/CD28 stimulation).

Main Results:

  • Malignant T cells from SS patients express functional Kv1.3 channels.
  • Potent Kv1.3 inhibitors (ShK, Vm24) significantly inhibited SS cell proliferation, IL-9 expression, and CD25 induction in a dose-dependent manner.
  • Kv1.3 blockade did not induce apoptosis or affect cell death in SS cells.

Conclusions:

  • This study provides the first evidence of functional Kv1.3 channel expression in malignant T cells from Sézary syndrome patients.
  • Kv1.3 blockade effectively inhibits key activation pathways in SS cells, including proliferation and cytokine production.
  • Kv1.3 represents a promising therapeutic target for Sézary syndrome treatment.
Keywords:
Kv1.3 channelShKSézary syndromecancercutaneous T-cell lymphoma

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