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Related Experiment Videos

Human neutrophil motility: time-dependent three-dimensional shape and granule diffusion

S Felder1, Z Kam

  • 1Department of Chemical Immunology, Weizmann Institute of Science, Rehovot, Israel.

Cell Motility and the Cytoskeleton
|January 1, 1994
PubMed
Summary

Human polymorphonuclear leukocytes (PMNs) exhibit a distinct locomotion cycle, involving extension and rapid movement. This cellular motion is characterized by periodic speed bursts and cytoskeletal changes, crucial for cell migration.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Immunology

Background:

  • Understanding leukocyte locomotion is critical for immune response and disease processes.
  • Previous studies have provided insights into cell movement but lacked detailed dynamic analysis.

Purpose of the Study:

  • To investigate the dynamic three-dimensional movement and internal cytoplasmic changes of human polymorphonuclear leukocytes (PMNs) during locomotion.
  • To correlate cytoskeletal behavior with cell velocity and granule diffusion during directed cell migration.

Main Methods:

  • Reconstruction of 3D cell shapes using time-series differential interference contrast (DIC) microscopy.
  • Measurement of cytoplasmic granule diffusion via quasielastic laser light scattering (QELS).
  • Quantitative morphometric analysis and time-lapse video analysis of cell edges and velocities.

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Main Results:

  • PMNs displayed oscillatory locomotion in chemotactic gradients, with velocities peaking between 10-30 microns/min (period 50-55 seconds).
  • A fibroblast-like cycle was observed, involving lamella extension, substrate contact, and rapid cell body/nucleus movement.
  • Cytoplasmic granule diffusion decreased significantly during rapid locomotion, indicating cytoskeletal involvement.

Conclusions:

  • PMN locomotion involves a staged process of forward extension and subsequent cytoskeletal stiffening/contraction for body translocation.
  • The observed phase lag in velocity between cell layers and reduced granule diffusion support a dynamic cytoskeletal mechanism.
  • These findings provide a detailed spatiotemporal model of leukocyte migration.