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Tumor-derived NKG2D ligand sMIC reprograms NK cells to an inflammatory phenotype through CBM signalosome activation

Payal Dhar1, Fahmin Basher2, Zhe Ji3,4

  • 1Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.

Communications Biology
|July 23, 2021
PubMed

Insights

Soluble MIC (sMIC) reprograms Natural Killer (NK) cells into a dysfunctional state within the tumor microenvironment. Clearing sMIC restores NK cell anti-tumor activity, offering a new target for cancer immunotherapy.

Area of Science:

  • Immunology
  • Cancer Biology
  • Cellular Signaling

Background:

  • Natural Killer (NK) cell dysfunction correlates with poor clinical outcomes in cancer patients.
  • The mechanisms regulating NK cell dysfunction within the tumor microenvironment remain unclear.

Purpose of the Study:

  • To investigate the role of soluble MIC (sMIC) in reprogramming NK cell function in the tumor microenvironment.
  • To elucidate the signaling pathways affected by sMIC and membrane-bound MIC (mMIC).
  • To evaluate the therapeutic potential of targeting sMIC in NK cell-based cancer immunotherapy.

Main Methods:

  • Demonstration of sMIC-induced NK cell reprogramming in vitro.
  • Analysis of NK cell signaling pathways (CBM-signalosome, PLC2γ2/SLP-76/Vav1).
  • In vivo studies using antibody-mediated sMIC clearance and adoptively transferred NK cells.

Main Results:

  • Soluble MIC (sMIC) induces NK cell dysfunction, characterized by pro-tumorigenic cytokine secretion and reduced cytotoxicity.
  • sMIC selectively activates CBM-signalosome inflammatory pathways in NK cells.
  • Antibody-mediated clearance of sMIC restores NK cell cytotoxic effector function.
  • Membrane-bound MIC (mMIC) activates a distinct pathway (PLC2γ2/SLP-76/Vav1) promoting NK cell cytotoxicity.
  • Targeting sMIC enhanced the in vivo anti-tumor efficacy of adoptively transferred NK cells.

Conclusions:

  • sMIC is a key factor in inducing NK cell dysfunction within the tumor microenvironment.
  • Targeting sMIC represents a promising strategy to enhance NK cell-based cancer immunotherapy.
  • Understanding sMIC-mediated signaling provides a rationale for novel therapeutic approaches in cancer treatment.

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