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Extracellular matrix proteins regulate NK cell function in peripheral tissues.

Mark D Bunting1, Maulik Vyas1, Marta Requesens1

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Natural killer (NK) cells shift function from direct killing to cytokine release in tissues. This switch, influenced by extracellular matrix proteins and MHC-I status, impacts cancer immunity and solid organ transplant rejection.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Natural killer (NK) cells are crucial for innate immunity, typically rejecting MHC-I deficient targets.
  • However, NK cell function in solid organ transplantation and peripheral tissues remains less understood compared to bone marrow engraftment.

Purpose of the Study:

  • To investigate the functional plasticity of NK cells upon tissue infiltration.
  • To elucidate the mechanisms governing NK cell cytotoxicity and cytokine production in the context of solid organ transplantation and cancer.

Main Methods:

  • Utilized skin transplant models with varying MHC-I expression and NK cell activating ligands.
  • Investigated the impact of extracellular matrix (ECM) proteins (collagen I, III, elastin) on NK cell function.
  • Assessed NK cell cytotoxicity and cytokine production in vitro and in vivo.
  • Analyzed MHC-I expression in human cancers (solid tumors vs. leukemias).

Main Results:

  • NK cells exhibit a functional switch from cytotoxicity to chemokine/cytokine production upon exiting circulation into tissues.
  • Extracellular matrix proteins like collagen and elastin inhibit NK cell cytotoxicity and promote cytokine release.
  • Blocking tumor collagen deposition enhanced NK cell cytotoxicity against MHC-I deficient melanoma.
  • MHC-I downregulation is prevalent in solid human cancers, unlike leukemias, making them targets for circulating NK cells.

Conclusions:

  • NK cell function is dynamically regulated by the tissue microenvironment, particularly ECM proteins.
  • This functional plasticity explains why NK cells reject MHC-I deficient bone marrow but not necessarily solid organs.
  • Targeting ECM interactions or exploiting MHC-I downregulation presents therapeutic opportunities in cancer immunotherapy.