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Soluble CTLA-4 attenuates T cell activation and modulates anti-tumor immunity

Paul T Kennedy1, Emma L Saulters1, Andrew D Duckworth2

  • 1Department of Pharmacology and Therapeutics, University of Liverpool, L69 3GE Liverpool, UK.

Molecular Therapy : the Journal of the American Society of Gene Therapy
|December 6, 2023
PubMed

Insights

Soluble CTLA-4 (sCTLA-4) expressed by tumors suppresses CD8+ T cells. Targeting sCTLA-4 with specific antibodies enhances T cell activity and controls tumor growth, revealing a new immunotherapy target.

Area of Science:

  • Immunology
  • Cancer Biology
  • Molecular Biology

Background:

  • Cytotoxic T-Lymphocyte-Associated protein 4 (CTLA-4) is a key immune checkpoint receptor regulating immune responses.
  • Antibodies targeting CTLA-4 are used in cancer immunotherapy, but their precise mechanisms remain unclear.
  • The role of the soluble variant, sCTLA-4, in cancer immunity has not been investigated.

Purpose of the Study:

  • To investigate the functional role of sCTLA-4 in cancer.
  • To evaluate the therapeutic potential of targeting sCTLA-4 with isoform-specific antibodies.

Main Methods:

  • In vitro assays to assess sCTLA-4 effects on CD8+ T cells.
  • In vivo murine cancer models to evaluate tumor growth and metastasis.
  • Isoform-specific antibody treatment against sCTLA-4.

Main Results:

  • Tumor-expressed sCTLA-4 suppresses CD8+ T cell activity in vitro.
  • sCTLA-4 accelerates tumor growth and metastasis in vivo by impairing CD8+ T cell cytotoxic function.
  • Treatment with anti-sCTLA-4 antibodies reversed T cell suppression, enhanced anti-tumor immunity, and improved tumor control.

Conclusions:

  • Tumor-derived sCTLA-4 plays a significant role in immune evasion and tumor progression.
  • Targeting sCTLA-4 represents a promising strategy for enhancing cancer immunotherapy.
  • Further elucidation of immune checkpoint receptor isoforms is crucial for optimizing cancer treatments.
Keywords:
cancerimmune checkpointimmune regulationimmunomodulationimmunotherapysoluble CTLA-4

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