Critical Behavior of Subcellular Density Organization During Neutrophil Activation and Migration

Sandra M. Baker-Groberg, Kevin G. Phillips, Laura D. Healy, Asako Itakura, Juliana E. Porter, Paul K. Newton, Xiaolin Nan, Owen McCarty

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Physical theories of active matter continue to provide a quantitative understanding of dynamic cellular phenomena, including cell locomotion. Although various investigations of the rheology of cells have identified important viscoelastic and traction force parameters for use in these theoretical approaches, a key variable has remained elusive both in theoretical and experimental approaches: the spatiotemporal behavior of the subcellular density. The evolution of the subcellular density has been qualitatively observed for decades as it provides the source of image contrast in label-free imaging modalities (e.g., differential interference contrast, phase contrast) used to investigate cellular specimens. While these modalities directly visualize cell structure, they do not provide quantitative access to the structures being visualized. We present an established quantitative imaging approach, non-interferometric quantitative phase microscopy, to elucidate the subcellular density dynamics in neutrophils undergoing chemokinesis following uniform bacterial peptide stimulation. Through this approach, we identify a power law dependence of the neutrophil mean density on time with a critical point, suggesting a critical density is required for motility on 2D substrates. Next we elucidate a continuum law relating mean cell density, area, and total mass that is conserved during neutrophil polarization and migration. Together, our approach and quantitative findings will enable investigators to define the physics coupling cytoskeletal dynamics with subcellular density dynamics during cell migration.

Original languageEnglish (US)
Pages (from-to)543-552
Number of pages10
JournalCellular and Molecular Bioengineering
Volume8
Issue number4
DOIs
StatePublished - Jun 3 2015

Fingerprint

Neutrophils
Neutrophil Activation
Critical Behavior
Migration
Activation
Chemical activation
Cell Movement
Rheology
Physics
Traction
Imaging techniques
Cell
Microscopy
Modality
Cell Count
Research Personnel
Peptides
Labels
Imaging
Microscopic examination

Keywords

  • Active matter
  • Chemokinesis
  • Motility
  • Neutrophil
  • Quantitative phase microscopy
  • Rheology
  • Subcellular density

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Modeling and Simulation

Cite this

Critical Behavior of Subcellular Density Organization During Neutrophil Activation and Migration. / Baker-Groberg, Sandra M.; Phillips, Kevin G.; Healy, Laura D.; Itakura, Asako; Porter, Juliana E.; Newton, Paul K.; Nan, Xiaolin; McCarty, Owen.

In: Cellular and Molecular Bioengineering, Vol. 8, No. 4, 03.06.2015, p. 543-552.

Research output: Contribution to journalArticle

Baker-Groberg, Sandra M. ; Phillips, Kevin G. ; Healy, Laura D. ; Itakura, Asako ; Porter, Juliana E. ; Newton, Paul K. ; Nan, Xiaolin ; McCarty, Owen. / Critical Behavior of Subcellular Density Organization During Neutrophil Activation and Migration. In: Cellular and Molecular Bioengineering. 2015 ; Vol. 8, No. 4. pp. 543-552.
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