Fractalkine Preferentially Mediates Arrest and Migration of CD16+ Monocytes

CD16+ monocytes represent 5–10% of peripheral blood monocytes in normal individuals and are dramatically expanded in several pathological conditions including sepsis, human immunodeficiency virus 1 infection, and cancer. CD16+ monocytes produce high levels of proinflammatory cytokines and may represent dendritic cell precursors in vivo. The mechanisms that mediate the recruitment of CD16+ monocytes into tissues remain unknown. Here we investigate molecular mechanisms of CD16+ monocyte trafficking and show that migration of CD16+ and CD16− monocytes is mediated by distinct combinations of adhesion molecules and chemokine receptors. In contrast to CD16− monocytes, CD16+ monocytes expressed high CX3CR1 and CXCR4 but low CCR2 and CD62L levels and underwent efficient transendo-thelial migration in response to fractalkine (FKN; FKN/CX3CL1) and stromal-derived factor 1α (CXCL12) but not monocyte chemoattractant protein 1 (CCL2). CD16+ monocytes arrested on cell surface–expressed FKN under flow with higher frequency compared with CD16− monocytes. These results demonstrate that FKN preferentially mediates arrest and migration of CD16+ monocytes and suggest that recruitment of this proinflammatory monocyte subset to vessel walls via the CX3CR1-FKN pathway may contribute to vascular and tissue injury during pathological conditions.

• Publication year

  2003

• Venue

  Journal of Experimental Medicine

• Publication date

  2003-06-16

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1084/jem.20022156PMID 12810688PMCID 2193954
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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