Three-dimensional reconstruction by scanning electron microscopy from serial epoxy resin semi-thin sections after...

Area of Science:

• Vascular Biology
• Microscopy Techniques
• Tissue Engineering

Background:

• Understanding the microvasculature is crucial for tissue repair and regeneration.
• Previous studies often lacked detailed three-dimensional structural information of newly formed vessels.

Purpose of the Study:

• To reconstruct the three-dimensional morphology of newly formed blood vessels in rabbit ear chambers.
• To evaluate the utility of scanning electron microscopy (SEM) of serial semi-thin sections for ultrastructural reconstruction.

Main Methods:

• Rabbit ear chamber connective tissue was processed using glutaraldehyde and osmium tetroxide fixation, followed by Epon embedding.
• One-micrometer serial sections were stained, observed by light microscopy, ion-etched, double-stained, platinum-coated, and imaged with SEM.
• Blood vessel and fibroblast profiles were digitized for computer-assisted 3D reconstruction.

Main Results:

• The newly formed blood vessel was reconstructed as a cylinder-like, endothelial tube with a smooth outer surface.
• Fibroblasts were observed surrounding the endothelial tube.
• Pores in the endothelial tube indicated high permeability and fragility of the newly formed vessel.

Conclusions:

• Three-dimensional reconstruction using SEM of serial semi-thin sections is a rapid and accessible method for visualizing complex microstructures.
• This technique allows for detailed ultrastructural analysis without requiring highly specialized skills.
• The study provides insights into the structural characteristics of newly formed blood vessels, highlighting their permeability and fragility.