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CD84 mediates CLL-microenvironment interactions.

A Marom1, A F Barak1, M P Kramer1

  • 1Department of Immunology, Weizmann Institute of Science, Rehovot, Israel.

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Summary
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Blocking CD84 interaction between chronic lymphocytic leukemia (CLL) cells and their microenvironment induces cancer cell death. This finding reveals a novel therapeutic strategy for treating CLL by targeting this survival pathway.

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Area of Science:

  • Immunology
  • Oncology
  • Cell Biology

Background:

  • Chronic lymphocytic leukemia (CLL) is a cancer of mature lymphocytes.
  • The CLL microenvironment promotes disease progression and drug resistance through cell-cell contact.
  • CD84, an immunoreceptor, forms homophilic dimers and may mediate interactions between CLL cells and their environment.

Purpose of the Study:

  • To investigate the role of CD84 in mediating interactions between CLL cells and their microenvironment.
  • To determine if CD84 signaling promotes CLL cell survival.
  • To explore the therapeutic potential of blocking CD84-mediated interactions in CLL.

Main Methods:

  • In vitro co-culture assays of CLL cells with microenvironmental cells.
  • In vitro and in vivo blockade of CD84 interactions.
  • Assessment of cell survival and cell death following CD84 blockade.

Main Results:

  • CD84 expressed on CLL cells interacts with CD84 on microenvironmental cells.
  • This interaction induces cell survival in both CLL and microenvironmental cells.
  • Blocking CD84 disrupts CLL cell-microenvironment interactions, leading to CLL cell death.

Conclusions:

  • CD84 acts as a bridge between CLL cells and their microenvironment, promoting survival.
  • Targeting the CD84-dependent survival pathway offers a novel therapeutic strategy for CLL.
  • CD84 blockade can induce cell death in chronic lymphocytic leukemia.