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A Rapid Approach to High-Resolution Fluorescence Imaging in Semi-Thick Brain Slices
Published on: July 26, 2011
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Single-Step Fast Tissue Clearing of Thick Mouse Brain Tissue for Multi-Dimensional High-Resolution Imaging
Youngjae Ryu1,2, Yoonju Kim1, Hye Ryeong Lim1
1Research Strategy Office and Brain Research Core Facilities of Korea Brain Research Institute, Daegu 41068, Korea.
International Journal of Molecular Sciences
|June 24, 2022
Summary
Researchers developed AICI, a new, affordable aqueous solution for rapid, one-step optical tissue clearing and refractive index matching. This method enhances deep tissue imaging of neuronal structures without specialized equipment or sample distortion.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Optical Imaging
Background:
- Optical clearing techniques improve deep tissue imaging but often involve complex protocols, specialized equipment, and issues like fluorescence bleaching and sample distortion.
- Existing refractive index matching solutions can be viscous and difficult to handle, limiting their practical application in thick tissue imaging.
Purpose of the Study:
- To develop a novel, cost-effective, and user-friendly aqueous solution for rapid optical tissue clearing and refractive index matching.
- To overcome the limitations of existing clearing methods, including viscosity, sample distortion, and specialized equipment requirements.
Main Methods:
- Development of an Aqueous high refractive Index matching and tissue Clearing solution for Imaging (AICI) using a simple, equipment-free laboratory protocol.
- Comparison of AICI with commercially available optical clearing agents (OCAs) and refractive index matching solutions.
- Evaluation of AICI's clearing speed, refractive index, viscosity, sample volume changes, fluorescence retention, and imaging capabilities for neuronal structures.
Main Results:
- AICI rapidly clears 1 mm thick brain slices within 90 min with simultaneous refractive index matching (RI = 1.466) and low viscosity.
- Treated tissues exhibited minimal linear expansion (<2.3%) over 24 hours, and AICI remained fluid for over 30 days.
- AICI demonstrated effective imaging of fine neuronal structures like dendritic spines and axonal boutons in thick brain slices, with minimal EGFP fluorescence reduction (~65% after 10 days).
Conclusions:
- AICI offers a practical, affordable, and efficient solution for one-step optical tissue clearing and refractive index matching, suitable for various imaging applications.
- The developed method facilitates high-resolution, three-dimensional imaging of neuronal structures and analysis of neuronal distribution, projection, and gene expression in deep brain tissues.
- AICI is broadly applicable across different tissue types and imaging modalities, making it a valuable tool for researchers in optical imaging.
