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Quantifying Human Monocyte Chemotaxis In Vitro and Murine Lymphocyte Trafficking In Vivo
08:38

Quantifying Human Monocyte Chemotaxis In Vitro and Murine Lymphocyte Trafficking In Vivo

Published on: October 30, 2017

Migratory Response of Human NK Cells to Monocyte-Chemotactic Proteins

Allavena1, Bianchi, Giardina

  • 1Department of Immunology and Cell Biology, Istituto di Ricerche Farmacologiche "Mario Negri,", Via Eritrea 62, Milan, 20157, Italy

Methods (San Diego, Calif.)
|August 1, 1996
PubMed

Insights

Natural killer (NK) cells rapidly accumulate at extrahepatic sites. This study shows that C-C chemokines like MCP-1 induce NK cell migration, crucial for tissue recruitment.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Natural killer (NK) cells are immune cells primarily found in blood and spleen.
  • Under specific conditions, NK cells can migrate to and accumulate at sites outside the bloodstream (extrahematic sites).
  • Understanding the mechanisms of NK cell emigration is vital for controlling their tissue distribution.

Purpose of the Study:

  • To investigate the responsiveness of NK cells to C-C chemokines.
  • To elucidate the mechanisms underlying NK cell emigration from the bloodstream.
  • To determine the role of chemokines in NK cell recruitment to tissues.

Main Methods:

  • Investigated NK cell migration across polycarbonate filters using chemokines like MCP-1, MCP-2, and MCP-3.
  • Assessed the binding of labeled MCP-1 to IL-2-activated NK cells.
  • Utilized cholera toxin and Bordetella pertussis toxin to study signaling pathways involved in migration.
  • Analyzed the expression of mRNA for MCP-1 receptors in NK cells.

Main Results:

  • Monocyte chemoattractant protein-1 (MCP-1) induced significant migration of IL-2-activated NK cells, but not unstimulated cells.
  • Related chemokines MCP-2 and MCP-3 also demonstrated chemoattractant activity.
  • IL-2-activated NK cells exhibited specific binding sites for MCP-1.
  • Cell migration was inhibited by cholera and Bordetella pertussis toxins, suggesting G protein-coupled receptor involvement.
  • mRNA expression for MCP-1 receptors was detected exclusively in IL-2-activated NK cells.

Conclusions:

  • NK cell responsiveness to MCP-1 and related chemokines is dependent on activation status (e.g., IL-2 activation).
  • These chemokine interactions are likely a key factor in NK cell emigration from blood into tissues.
  • The findings provide insights into the molecular mechanisms governing NK cell trafficking and tissue-specific accumulation.

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