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Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages
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Investigation of Macrophage Polarization Using Bone Marrow Derived Macrophages

Published on: June 23, 2013

The interaction of human natural killer cells with either unpolarized or polarized macrophages results in different

Francesca Bellora1, Roberta Castriconi, Alessandra Dondero

  • 1Dipartimento di Medicina Sperimentale, Università degli Studi di Genova, 16132 Genova, Italy.

Proceedings of the National Academy of Sciences of the United States of America
|December 2, 2010
PubMed

Insights

Interactions between natural killer (NK) cells and macrophages reveal that M1 macrophages resist NK cell killing. Macrophage activation by microbial products drives NK cell responses, influencing immune system balance.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Cell-to-cell communication within the innate immune system is crucial for regulating both innate and adaptive immunity.
  • Natural killer (NK) cells and macrophages are key players in innate immunity, with their interactions significantly impacting immune responses.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the interactions between human natural killer (NK) cells and autologous macrophages.
  • To determine how different macrophage polarization states (M0, M1, M2) affect NK cell activation, cytotoxicity, and cytokine production.

Main Methods:

  • Co-culture of human NK cells with autologous M0, M1, and M2 macrophages.
  • Analysis of NK cell activation markers (CD69, CD25), cytotoxicity, and cytokine production (IFN-γ).
  • Investigation of the role of cell contact, soluble factors, and specific molecular interactions (DNAM-1, 2B4, IL-18).

Main Results:

  • Activated NK cells effectively killed M0 and M2 macrophages, but M1 macrophages showed resistance due to higher HLA class I expression.
  • M0 and M2 macrophages, when exposed to LPS or bacillus Calmette-Guérin, induced significant NK cell activation, characterized by increased CD69 and CD25 expression and cytotoxicity.
  • NK cell IFN-γ production was contact-dependent, requiring interactions via DNAM-1 and 2B4, along with IL-18, while IL-18 also mediated CCR7 acquisition.
  • M1-polarizing stimuli could alter M2 macrophages, enhancing their capacity to stimulate NK cells.

Conclusions:

  • NK cell and macrophage interactions are complex and modulated by macrophage polarization state.
  • Macrophage-derived soluble factors and cell-contact dependent interactions are critical for orchestrating NK cell responses.
  • These findings highlight the potential for manipulating macrophage polarization to modulate NK cell-mediated immunity, particularly in type 1 immune responses.

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