Immunolabeling-compatible PEGASOS tissue clearing for high-resolution whole mouse brain imaging.

Area of Science:

• Neuroscience
• Biotechnology
• Medical Imaging

Background:

• Advanced brain imaging techniques improve visualization but struggle to integrate with traditional immunostaining.
• Signal quenching during tissue clearing compromises molecular and genetic signals, limiting comprehensive brain analysis.

Purpose of the Study:

• To develop and validate an immunostaining-compatible tissue clearing method (iPEGASOS) for enhanced whole-brain visualization.
• To address signal quenching issues in conventional clearing procedures.
• To demonstrate the versatility of iPEGASOS for various neurobiological applications.

Main Methods:

• Integration of whole-mount immunostaining with PEGASOS tissue clearing to create iPEGASOS.
• Application of iPEGASOS to transgenic reporter mouse lines for cellular population mapping.
• Utilizing iPEGASOS for enhanced visualization of viral tracers in neural circuit tracing.
• Employing iPEGASOS for beta-amyloid deposit labeling in an Alzheimer's disease mouse model.

Main Results:

• iPEGASOS effectively enhances molecular-genetically targeted fluorescent signals compromised in conventional clearing.
• Improved visualization of whole-brain spatial distribution of specific cellular populations in transgenic mice.
• Significantly enhanced visualization of neural circuit connections via viral tracers.
• Successful labeling of beta-amyloid deposits for whole-brain pathological studies.

Conclusions:

• iPEGASOS provides a versatile and effective solution for whole-brain imaging by combining immunostaining with tissue clearing.
• This method overcomes previous limitations, enabling detailed visualization of cellular, circuit, and pathological features.
• iPEGASOS expands the possibilities for comprehensive neurobiological research and disease modeling.