X-Ray-Based 3D Histopathology of the Kidney Using Cryogenic Contrast-Enhanced MicroCT

Area of Science:

• Nephrology
• Biomedical Imaging
• Histopathology

Background:

• Classical 2D histology limits visualization of the kidney's complex 3D microstructure.
• Kidney microstructure is crucial for function and susceptible to pathology.
• Advanced 3D imaging is needed to fully understand kidney structure and disease.

Purpose of the Study:

• To present cryogenic contrast-enhanced microCT (cryo-CECT) for high-resolution 3D kidney visualization.
• To optimize sample preparation protocols for cryo-CECT of kidney tissue.
• To assess the utility of cryo-CECT in detecting microstructural changes in kidney injury models.

Main Methods:

• Evaluated various contrast-enhancing staining agents and freezing protocols for microCT.
• Developed an optimized protocol using hafnium-substituted polyoxometalate staining and isopentane freezing.
• Applied cryo-CECT to visualize glomeruli, tubuli, and vasculature in a mouse model of acute kidney injury.

Main Results:

• Cryo-CECT successfully achieved 3D visualization of kidney microstructures.
• The optimized protocol demonstrated high sensitivity in detecting microstructural alterations.
• Pathology-induced changes in a mouse model of acute kidney injury were successfully identified.

Conclusions:

• Cryo-CECT is an effective tool for 3D histopathological analysis of kidney tissue.
• This technique enhances the understanding of kidney microstructure and its relationship to function.
• Cryo-CECT facilitates the detection of subtle pathological changes in kidney disease.