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Mouse fibroblast cell adhesion studied by neutron reflectometry.

Hillary L Smith1, Joseph Hickey, Michael S Jablin

  • 1Lujan Neutron Scattering Center, Los Alamos, New Mexico, USA.

Biophysical Journal
|March 4, 2010
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Summary

Neutron reflectometry successfully visualized live mouse fibroblast cells on quartz. This technique quantified the cell-substrate interface, revealing an average cell membrane distance of 180 Angstroms.

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Area of Science:

  • Biophysics
  • Materials Science
  • Cell Biology

Background:

  • Understanding cell-substrate interactions is crucial for biomaterials and cell culture.
  • Previous methods lacked subnanometer resolution at the cell-material interface.
  • Live cell analysis requires non-invasive techniques compatible with physiological conditions.

Purpose of the Study:

  • To visualize and quantify the interface between live mouse fibroblast cells and a quartz substrate using neutron reflectometry.
  • To determine the distance and structure of the cell membrane region at the cell-substrate interface.
  • To demonstrate the capability of neutron reflectometry for live cell-substrate interface analysis.

Main Methods:

  • Neutron reflectometry (NR) measurements were performed on live mouse fibroblast cells cultured on a quartz substrate.
  • Experiments were conducted in a deuterated phosphate-buffered saline environment at room temperature.
  • Control measurements included pure growth medium and cell detachment experiments using distilled water and trypsin.

Main Results:

  • Achieved subnanometer resolution visualization of the live cell-substrate interface, a first for neutron reflectometry.
  • Quantified the average distance from the quartz substrate to the center of the cell membrane region as approximately 180 Angstroms.
  • Characterized the cell membrane region as approximately 80 Angstroms thick, with inhomogeneous distribution and undulating membranes.

Conclusions:

  • Neutron reflectometry provides unprecedented subnanometer resolution for studying live cell-substrate interfaces.
  • The study established a method for quantifying cell adhesion parameters at the nanoscale.
  • Demonstrated the potential of NR for analyzing cell behavior and interactions with surfaces in biologically relevant environments.