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Expansion Microscopy: High-Resolution Fluorescent Imaging with a Conventional Microscope
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Basics of Expansion Microscopy.

Aleksandra Klimas1, Brendan Gallagher1, Yongxin Zhao1

  • 1Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, Pennsylvania.

Current Protocols in Cytometry
|November 26, 2019
PubMed
Summary
This summary is machine-generated.

Expansion microscopy (ExM) overcomes optical limits by physically expanding tissues, enabling nanoscale imaging of proteins in brain samples using standard microscopes.

Keywords:
expansion microscopyfluorescence microscopyimmunohistochemistrynanoscale imagingsuper-resolution imaging

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Area of Science:

  • Neuroscience
  • Biotechnology
  • Microscopy

Background:

  • Conventional optical imaging is limited by the diffraction limit, preventing visualization of nanoscopic structures (<300 nm).
  • Understanding brain function and disease pathogenesis requires higher resolution imaging.
  • Expansion microscopy (ExM) offers a solution by physically enlarging biological samples.

Purpose of the Study:

  • To present a variant of Expansion Microscopy (ExM) optimized for imaging proteins in expanded brain tissues.
  • To provide a protocol using standard laboratory reagents and equipment.
  • To enable nanoscale precision imaging with conventional microscopes.

Main Methods:

  • Preserved tissues are embedded in a swellable hydrogel.
  • Biomolecules are covalently linked to a polymer matrix.
  • The tissue-gel is mechanically homogenized and isotropically expanded (≥100-fold) in water.

Main Results:

  • Expansion microscopy circumvents the optical diffraction limit.
  • Nanoscale precision is achieved in expanded brain tissues.
  • Proteins can be imaged with high resolution using standard microscopes.

Conclusions:

  • ExM enables nanoscale imaging of proteins in brain tissue.
  • This protocol is accessible using typical biology laboratory resources.
  • ExM facilitates detailed investigation of brain structures and disease mechanisms.