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Quantifying the Cytotoxicity of Staphylococcus aureus Against Human Polymorphonuclear Leukocytes
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Forces between Staphylococcus aureus and human skin.

Cécile Formosa-Dague1, Zhuo-Han Fu, Cécile Feuillie

  • 1Institute of Life Sciences, Université catholique de Louvain, Croix du Sud, 4-5, bte L7.07.06, B-1348 Louvain-la-Neuve, Belgium. Yves.Dufrene@uclouvain.be.

Nanoscale Horizons
|April 9, 2020
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Summary
This summary is machine-generated.

We developed a new atomic force microscopy method to measure nanoscale forces between bacteria and skin. This reveals strong Staphylococcus aureus adhesion to skin, crucial for understanding skin microbiome and disorders.

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Area of Science:

  • Microbiology
  • Biophysics
  • Dermatology

Background:

  • Understanding microbe-skin interactions is key for skin microbiome research and skin disorder insights.
  • Previous molecular methods could not study the forces governing these interactions.

Purpose of the Study:

  • To develop and apply a novel atomic force microscopy (AFM) approach for quantifying nanoscale interaction forces between Staphylococcus aureus and human skin.
  • To elucidate the molecular basis of bacterial adhesion to skin.

Main Methods:

  • Developed a method combining nanoscale multiparametric imaging with single bacterial probes.
  • Utilized single-cell force spectroscopy to quantify adhesion forces.
  • Mapped topography and bacterial-binding properties of corneocytes at high resolution.

Main Results:

  • Quantified strong adhesion forces (approximately 500 pN) between S. aureus and human skin.
  • Identified specific bonds between bacterial adhesins and corneocyte surface ligands as the source of adhesion.
  • Demonstrated a high-resolution mapping of microbe-skin interactions.

Conclusions:

  • The novel AFM methodology allows precise measurement of microbe-skin interaction forces.
  • Strong, specific molecular interactions mediate S. aureus colonization of human skin.
  • This approach has broad applications for studying skin colonization and infection by various microbes.