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Dissecting Multi-protein Signaling Complexes by Bimolecular Complementation Affinity Purification BiCAP
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CD47-signal regulatory protein α signaling system and its application to cancer immunotherapy

Yoji Murata1, Yasuyuki Saito1, Takenori Kotani1

  • 1Division of Molecular and Cellular Signaling, Department of Biochemistry and Molecular Biology, Kobe University Graduate School of Medicine, Kobe, Japan.

Cancer Science
|June 7, 2018
PubMed

Insights

Blocking the CD47-SIRPα pathway enhances immune cell activity against cancer cells. This approach shows promise for new cancer treatments by boosting both innate and adaptive immune responses.

Area of Science:

  • Immunology
  • Oncology
  • Cell Biology

Background:

  • Tumor cells evade immune surveillance by interacting with immune cells.
  • The CD47-SIRPα axis is a key cell-cell communication system involved in immune evasion.
  • CD47 is upregulated on cancer cells, while SIRPα is abundant on myeloid immune cells.

Purpose of the Study:

  • To investigate the therapeutic potential of targeting the CD47-SIRPα interaction in cancer treatment.
  • To evaluate the impact of CD47-SIRPα blockade on immune cell-mediated tumor cell clearance.
  • To explore combination strategies involving CD47-SIRPα blockade and immune checkpoint inhibitors.

Main Methods:

  • Utilizing biological agents like antibodies and recombinant proteins to block CD47 or SIRPα.
  • Testing blockade strategies in in vitro assays and in vivo preclinical cancer models (xenograft and syngeneic).
  • Assessing enhancement of phagocytic activity and stimulation of cytotoxic T cells.

Main Results:

  • CD47-SIRPα blockade significantly enhances macrophage phagocytosis of tumor cells in vitro.
  • Blockade leads to efficient tumor cell eradication in various mouse cancer models.
  • CD47 blockade promotes the activation of tumor-specific cytotoxic T cells by antigen-presenting cells.
  • Preclinical studies suggest synergistic antitumor effects when combined with immune checkpoint inhibitors.

Conclusions:

  • Targeting the CD47-SIRPα signaling pathway is a promising cancer immunotherapy strategy.
  • Modulating this axis enhances both innate (phagocytosis) and adaptive (T cell) immune responses against tumors.
  • Combination therapies involving CD47-SIRPα blockade offer potential for improved cancer treatment outcomes.
Keywords:
CD47cancer immunotherapymacrophagephagocytosissignal regulatory protein α (SIRPα)

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