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CX3CL1 homo-oligomerization drives cell-to-cell adherence.

Mariano A Ostuni1,2, Patricia Hermand1,2, Emeline Saindoy1,3

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Summary
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The transmembrane chemokine CX3CL1 forms self-assembled clusters essential for leukocyte adhesion during inflammation. Inhibiting this oligomerization blocks cellular adherence, offering new therapeutic targets.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cellular Adhesion

Background:

  • Leukocyte adhesion to endothelium is crucial during inflammatory responses.
  • Transmembrane chemokines, like CX3CL1 (fractalkine), mediate this adhesion.
  • The assembly and functional role of CX3CL1 clusters were previously unknown.

Purpose of the Study:

  • To investigate the oligomerization of CX3CL1 and its role in cellular adhesion.
  • To determine the driving forces behind CX3CL1 cluster formation.
  • To explore the functional consequences of CX3CL1 oligomerization on leukocyte adherence.

Main Methods:

  • Native electrophoresis and single-molecule fluorescence kinetics to analyze CX3CL1 clusters.
  • Fluorescence recovery after photobleaching assays to study self-association.
  • Cellular and acellular lipid environments were used for peptide association studies.
  • Molecular modeling to predict cluster structure.
  • Functional assays using CX3CL1 transmembrane peptides to assess inhibition of oligomerization and adhesion.

Main Results:

  • CX3CL1 forms homo-oligomers of 3 to 7 monomers.
  • Oligomerization is driven by intrinsic properties of CX3CL1, indicated by self-association of its transmembrane domain peptide.
  • Molecular modeling suggests linear, side-by-side assembly of monomers rather than compact bundles.
  • The CX3CL1 transmembrane peptide inhibits both oligomerization and leukocyte adhesion.

Conclusions:

  • CX3CL1 oligomerization is a prerequisite for its adhesive function.
  • The findings elucidate the mechanism of CX3CL1-mediated cellular adherence.
  • This research opens avenues for controlling CX3CL1-dependent immune processes.