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Three-dimensional viewing of internal cell structure.

¹Agriculture Canada, Research Branch, Ottawa, Ontario.

Scanning Microscopy. Supplement

|January 1, 1989

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This study introduces a rapid freezing technique for cells, preserving ultrastructure without ice crystal damage. It enables detailed visualization of cellular components using scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

Area of Science:

Cell Biology
Microscopy Techniques

Background:

Preserving cellular ultrastructure is crucial for understanding cell biology.
Traditional fixation and preparation methods can introduce artifacts.
Rapid freezing offers a potential alternative for preserving native cellular structures.

Purpose of the Study:

To develop and evaluate a rapid freezing and preparation technique for high-resolution imaging of cells.
To assess the effectiveness of the technique in minimizing ice crystal damage.
To enable detailed visualization of cellular components using SEM and TEM.

Main Methods:

Rapid freezing of 3T3 and HeLa cells using propane jet without pretreatment.
Fracturing frozen cells at -170°C, followed by thawing and critical-point drying for SEM.

Related Experiment Videos

Thawing unfractured cells, refreezing in methanol, fracturing, and deep-etching for TEM.

Light initial fixation (0.3% glutaraldehyde for 10 mins) for SEM to retain antigenicity.

Main Results:

The technique demonstrated rapid rewarming from -170°C to 0°C with minimal ice crystal formation.
SEM imaging of fractured cells revealed extensive extraction of nuclear and cytoplasmic components.
Detailed views of nuclear chromatin and cytoplasmic organelles amidst distorted cytoskeletal filaments were observed.
The light fixation preserved structures suitable for subsequent antibody labeling.

Conclusions:

The developed rapid freezing and preparation technique effectively preserves cellular ultrastructure.
This method minimizes ice crystal artifacts, allowing for high-resolution SEM and TEM imaging.
The technique is suitable for studying cellular architecture and preparing cells for immunolabeling.