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A Label-free Technique for the Spatio-temporal Imaging of Single Cell Secretions
Published on: November 23, 2015
Single-molecule imaging of cell surfaces using near-field nanoscopy
Peter Hinterdorfer1, Maria F Garcia-Parajo, Yves F Dufrêne
1Institute for Biophysics, Christian Doppler Laboratory of Nanoscopic Methods in Biophysics, Johannes Kepler University Linz, Altenbergerstrasse 69, A-4040 Linz, Austria. Peter.Hinterdorfer@jku.at
Accounts of Chemical Research
|October 14, 2011
Summary
High-resolution imaging techniques like atomic force microscopy (AFM) and near-field scanning optical microscopy (NSOM) reveal how single molecules on cell surfaces organize and function, advancing our understanding of cellular processes.
Area of Science:
- Cell Biology
- Nanotechnology
- Microscopy
Background:
- Living cells use surface molecules for environmental sensing and response.
- Cell surface processes like adhesion, communication, and infection involve nanoscale molecular interactions.
- High-resolution imaging is crucial for understanding single-molecule behavior on cell surfaces.
Purpose of the Study:
- To demonstrate the utility of AFM and NSOM for mapping single-molecule distribution on cell surfaces.
- To provide new insights into the functions of cell surface molecules at the nanoscale.
- To highlight recent breakthroughs in near-field nanoscopy for cell biology.
Main Methods:
- Atomic Force Microscopy (AFM) with antibody/ligand-labeled tips for molecular recognition imaging.
- Near-field Scanning Optical Microscopy (NSOM) using a nanoscale aperture optical fiber for simultaneous topographic and optical imaging.
- Fluorescent labeling of cell surface molecules for NSOM visualization.
Main Results:
- AFM and NSOM enable nanometer spatial resolution mapping of single-molecule distribution on living cells.
- Near-field nanoscopy has deciphered bacterial cell wall architecture and receptor nanodomain assembly.
- Understanding of cell membrane component assembly and communication has been advanced.
Conclusions:
- AFM and NSOM offer unprecedented capabilities for studying cell surface molecular organization and function.
- Future directions include combining imaging with force spectroscopy and advancements in high-speed AFM.
- Emerging photonic and plasmonic technologies promise enhanced nanoimaging and nanospectroscopy in cell biology.
