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Complement C5a-Induced Changes in Neutrophil Morphology During Inflammation.

S Denk1, R P Taylor2, R Wiegner1

  • 1Institute of Clinical and Experimental Trauma-Immunology, University Hospital Ulm, Ulm, Germany.

Scandinavian Journal of Immunology
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Summary
This summary is machine-generated.

Complement activation product C5a rapidly changes neutrophil shape and increases deformability, preparing them for migration to inflammatory sites. This process involves actin polymerization and ion channel activity, crucial for innate immunity.

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Area of Science:

  • Innate Immunity
  • Cellular Biology
  • Immunology

Background:

  • Neutrophils are key players in innate immunity, migrating to sites of inflammation and infection.
  • The complement system, particularly C5a, is activated during these processes.
  • Understanding how C5a influences neutrophil behavior is crucial for immune response.

Purpose of the Study:

  • To investigate the hypothesis that C5a induces significant changes in neutrophil morphology before chemotaxis.
  • To elucidate the molecular mechanisms underlying C5a-mediated neutrophil shape changes and their impact on migration.

Main Methods:

  • Flow cytometry to assess cell shape changes (forward-scatter area).
  • High-resolution digital imaging (Amnis) for detailed morphological analysis.
  • Microfluidic optical stretching to measure neutrophil biomechanical properties (deformability).
  • Pharmacological inhibition of ion channels and purinoceptors.
  • Actin polymerization assays.

Main Results:

  • C5a rapidly and dose-dependently induced neutrophil shape changes via C5a receptor-1 (C5aR1).
  • Morphological changes included decreased circularity and increased length/width ratio, alongside increased deformability.
  • C5a-induced changes were dependent on actin polymerization, ion channel activity, and purinoceptor signaling.
  • These shape alterations preceded and were necessary for subsequent C5a-dependent chemotaxis.

Conclusions:

  • Anaphylatoxin C5a regulates fundamental neutrophil processes, increasing membrane elasticity and cell size.
  • Actin-cytoskeleton reorganization driven by C5a transforms neutrophils into migratory cells.
  • This transformation is essential for neutrophils to effectively reach inflammatory sites and perform their immune functions.