3D d STORM Imaging of Fixed Brain Tissue

Area of Science:

• Neuroscience
• Microscopy
• Molecular Biology

Background:

• The central nervous system has a high density of synapses, crucial for information transmission.
• The intricate molecular machinery of synapses presents a challenge for traditional light microscopy.
• Understanding synaptic nanostructure is key to deciphering neural function.

Purpose of the Study:

• To describe novel light microscopy approaches for examining synaptic molecular nanostructure.
• To achieve high resolution (20-30 nm lateral, 50-70 nm axial) in complex brain tissue.
• To enable 3D nanolocalization of proteins within defined synaptic volumes.

Main Methods:

• Single-molecule localization microscopy (SMLM) on immunolabeled, fixed brain tissue slices.
• Array tomography (tomoSTORM) for SMLM in 40 nm resin-embedded sections.
• Direct stochastic optical reconstruction microscopy (dSTORM) on cryo-sectioned hydrated sections.

Main Results:

• Developed two distinct SMLM-based methods for synaptic nanostructure analysis.
• Achieved high-resolution 3D nanolocalization of multiple proteins within synapses.
• Demonstrated applicability to complex brain tissue architecture.

Conclusions:

• These SMLM approaches provide powerful tools for studying synaptic molecular organization.
• The methods facilitate detailed investigation of pre- and postsynaptic specializations.
• The study reviews critical aspects of sample preparation, data acquisition, and analysis for SMLM in neuroscience.