Array tomography: high-resolution three-dimensional immunofluorescence.

Area of Science:

• Microscopy
• Cell Biology
• Biotechnology

Background:

• Traditional microscopy methods face limitations in resolving complex 3D tissue structures.
• There is a need for advanced imaging techniques to visualize molecular architecture at high resolution.

Purpose of the Study:

• To describe array tomography, a volumetric microscopy method.
• To highlight its capabilities for high-resolution 3D imaging and quantitative analysis of tissues.

Main Methods:

• Physical serial sectioning of plastic-embedded tissues using an ultramicrotome.
• Array formation of ultrathin sections on a coverslip for staining and imaging.
• Computational reconstruction of 2D image tiles into 3D volumes.

Main Results:

• Achieved high-resolution, depth-invariant imaging with molecular discrimination.
• Enabled reliable section handling, automated imaging, and multi-modal imaging (fluorescence, electron microscopy).
• Facilitated repeated cycles of staining, imaging, and stain elution for comprehensive analysis.

Conclusions:

• Array tomography provides unprecedented visualization and quantification of tissue structure and molecular architecture.
• Despite fabrication challenges, the method's capabilities justify its use for complex biological samples.
• This technique opens new avenues for exploring previously inaccessible biological features.