Expansion microscopy: A powerful nanoscale imaging tool for neuroscientists

Area of Science:

• Neuroscience
• Microscopy
• Molecular Biology

Background:

• Understanding the molecular basis of behavior and neurological disease requires high-resolution imaging of neural circuits.
• Conventional light microscopy is limited by the optical diffraction limit, hindering visualization of nanoscale structures.
• Super-resolution microscopy offers improved resolution, but Expansion Microscopy (ExM) provides an alternative physical magnification approach.

Purpose of the Study:

• To review the principles and methods of Expansion Microscopy (ExM).
• To discuss the application of ExM in diverse model organisms and human tissues.
• To highlight ExM's utility in synaptic imaging, neuronal tracing, and studying neurological diseases.

Main Methods:

• Expansion Microscopy (ExM) physically magnifies biological specimens to overcome the diffraction limit.
• Review of various ExM techniques and their implementation.
• Application of ExM across model systems including C. elegans, Drosophila, zebrafish, mouse, and human tissues.

Main Results:

• ExM enables nanoscale imaging in the 10-100 nm range by circumventing the diffraction limit.
• ExM has been successfully applied to diverse biological samples, including complex nervous systems.
• ExM facilitates detailed analysis of synaptic structures, neuronal connectivity, and disease-related molecular organizations.

Conclusions:

• Expansion Microscopy is a powerful and versatile tool for nanoscale imaging in neurosciences.
• ExM offers a complementary approach to super-resolution techniques for studying neural architecture and function.
• Further development and application of ExM hold significant promise for advancing our understanding of brain function and disease.