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Author Spotlight: Universal Molecular Retention with 11-Fold Expansion Microscopy
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Expansion STED microscopy (ExSTED).

Mengfei Gao1, Ria Thielhorn2, Jakob Rentsch2

  • 1Max Planck Institut für molekulare Zellbiologie und Genetik, Dresden, Germany; Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany.

Methods in Cell Biology
|January 22, 2021
PubMed
Summary
This summary is machine-generated.

Expansion microscopy (ExM) physically enlarges cellular structures for enhanced imaging. A new protocol, ExSTED, combines ExM with stimulated emission depletion microscopy for up to 30-fold resolution improvement.

Keywords:
Expansion microscopyMicrotubuleStimulated emission depletion microscopySuper-resolution microscopy

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Area of Science:

  • Microscopy
  • Cell Biology
  • Biotechnology

Background:

  • Expansion microscopy (ExM) overcomes the diffraction limit of light by physically expanding cell structures.
  • ExM enlarges intermolecular distances, enabling visualization with conventional fluorescence microscopy.
  • Combining ExM with super-resolution techniques can further enhance resolution.

Purpose of the Study:

  • To introduce ExSTED, a novel protocol combining ExM and stimulated emission depletion (STED) microscopy.
  • To demonstrate the capability of ExSTED to achieve significantly improved resolution.
  • To provide a detailed protocol for implementing ExSTED.

Main Methods:

  • Physical expansion of cellular structures using a hydrogel polymerization and expansion process.
  • Integration of ExM with stimulated emission depletion (STED) microscopy.
  • Development of a high-intensity fluorescence labeling strategy for optimal signal retention.

Main Results:

  • Achieved a resolution increase of up to 30-fold compared to conventional microscopy.
  • Demonstrated resolution surpassing that of conventional STED microscopy alone.
  • Validated the effectiveness of the high-intensity labeling strategy within the ExSTED protocol.

Conclusions:

  • ExSTED offers a powerful method for achieving ultra-high resolution imaging in cell biology.
  • The protocol provides a practical approach to significantly enhance microscopy resolution.
  • ExSTED expands the possibilities for visualizing nanoscale cellular structures.