Dynamics of neutrophil membrane compliance and microstructure probed with a micropipet-based piconewton force transducer

Scott I. Simon, Tun Nyunt, Kathryn Florine-Casteel, Ken Ritchie, H. P. Ting-Beall, Evan Evans, David Needham

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A novel biointerface probe was implemented to study the deformability of the neutrophil membrane and cortical cytoskeleton. Piconewton scale forces are applied to the cell using an ultrasensitive and tunable force transducer comprised of an avidin-coated microsphere attached to a biotinylated and swollen red blood cell. Deformations of freshly isolated human neutrophils were observed on the stage of an inverted phase contrast microscope. Force versus probe indentation curves over a cycle of contact, indentation, and retraction revealed three distinct material responses. Small probe deformations (∼ 500 nm) tested over a range of rates (e.g. 100-500 nm/s) revealed predominantly an elastic response. An initial low-slope region in the force-indentation curves (∼ 0.005 pN/nm), typically extending 0.5-1.0 μm from the cell surface was interpreted as probe contact with microvilli extensions. Further deformation yielded a slope of 0.054 ± 0.006 pN/nm, indicative of a stiffer cortical membrane. Disrupting cytoskeletal actin organization by pretreatment with cytochalasin D, reduced the slope by 40% to 0.033 ± 0.007 pN/nm and introduced hysteresis in the recovery phase. Modeling the neutrophil as a liquid drop with constant surface tension yielded values of cortical tension of 0.035 pN/nm for resting and 0.02 pN/nm for cytochalasin-treated neutrophils. These data demonstrate the utility of the biointerface probe for measuring local surface compliance and microstructure of living cells.

Original languageEnglish (US)
Pages (from-to)595-604
Number of pages10
JournalAnnals of Biomedical Engineering
Volume35
Issue number4
DOIs
StatePublished - Apr 2007

Fingerprint

Transducers
Membranes
Microstructure
Indentation
Cells
Formability
Microspheres
Surface tension
Hysteresis
Microscopes
Blood
Compliance
Recovery
Liquids

Keywords

  • Biointerface probe
  • Cortical tension
  • Cytochalasin D
  • Deformability
  • Microvilli
  • Neutrophil
  • Viscoelasticity

ASJC Scopus subject areas

  • Biomedical Engineering

Cite this

Simon, S. I., Nyunt, T., Florine-Casteel, K., Ritchie, K., Ting-Beall, H. P., Evans, E., & Needham, D. (2007). Dynamics of neutrophil membrane compliance and microstructure probed with a micropipet-based piconewton force transducer. Annals of Biomedical Engineering, 35(4), 595-604. https://doi.org/10.1007/s10439-007-9260-7

Dynamics of neutrophil membrane compliance and microstructure probed with a micropipet-based piconewton force transducer. / Simon, Scott I.; Nyunt, Tun; Florine-Casteel, Kathryn; Ritchie, Ken; Ting-Beall, H. P.; Evans, Evan; Needham, David.

In: Annals of Biomedical Engineering, Vol. 35, No. 4, 04.2007, p. 595-604.

Research output: Contribution to journalArticle

Simon, SI, Nyunt, T, Florine-Casteel, K, Ritchie, K, Ting-Beall, HP, Evans, E & Needham, D 2007, 'Dynamics of neutrophil membrane compliance and microstructure probed with a micropipet-based piconewton force transducer', Annals of Biomedical Engineering, vol. 35, no. 4, pp. 595-604. https://doi.org/10.1007/s10439-007-9260-7
Simon, Scott I. ; Nyunt, Tun ; Florine-Casteel, Kathryn ; Ritchie, Ken ; Ting-Beall, H. P. ; Evans, Evan ; Needham, David. / Dynamics of neutrophil membrane compliance and microstructure probed with a micropipet-based piconewton force transducer. In: Annals of Biomedical Engineering. 2007 ; Vol. 35, No. 4. pp. 595-604.
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