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F-actin distribution in polymorphonuclear leucocytes.

W S Haston1

  • 1Department of Bacteriology and Immunology, Western Infirmary, University of Glasgow, UK.

Journal of Cell Science
|November 1, 1987
PubMed
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Improved fixation techniques reveal distinct F-actin organization in motile neutrophils. Neutrophils in 3D collagen gels show prominent F-actin bands during contraction waves, unlike those on 2D surfaces or in suspension.

Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Neutrophil leucocytes exhibit polarization and amoeboid locomotion stimulated by chemotactic factors.
  • Cyclical contractile events drive neutrophil movement, but cytoskeletal coordination mechanisms remain unclear due to fixation challenges.

Purpose of the Study:

  • To elucidate the mechanisms of cytoskeletal coordination during neutrophil locomotion.
  • To investigate differences in F-actin organization in motile neutrophils on various substrata using improved fixation techniques.

Main Methods:

  • Improved fixation of motile neutrophils using low glutaraldehyde concentrations and glycine quenching.
  • Staining with TRITC-phalloidin to visualize F-actin distribution.
  • Analysis of neutrophil movement on two-dimensional substrata, three-dimensional collagen gels, and in suspension.

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Main Results:

  • Significant differences in TRITC-phalloidin staining patterns were observed in neutrophils moving on different substrata.
  • Prominent bands of F-actin were identified in neutrophils within collagen gels, corresponding to contraction waves.
  • These F-actin bands were absent in neutrophils in suspension or on two-dimensional substrata.
  • Motile neutrophils consistently displayed brightly stained anterior lamellipodia, with extensive ruffling on two-dimensional substrata.

Conclusions:

  • Improved fixation methods enable visualization of distinct F-actin organization related to the substratum.
  • Neutrophil locomotion involves substrate-dependent cytoskeletal rearrangements, particularly evident in three-dimensional environments.
  • The absence of consistent F-actin bands at contraction waves on 2D surfaces and in suspension warrants further investigation.