Preparation of cultured cells using high-pressure freezing and freeze substitution for subsequent 2D or 3D...

Area of Science:

• Electron microscopy
• Cell biology
• Virology

Background:

• Transmission electron microscopy (TEM) requires extensive sample processing that can introduce artifacts.
• The high vacuum and electron beam in TEM are detrimental to biological samples.
• Biological samples often lack intrinsic electron contrast and are not naturally thin enough for TEM.

Purpose of the Study:

• To describe a sample preparation method for TEM that minimizes artifacts.
• To preserve ultrastructural details of biological samples, particularly for virus-host interaction studies.

Main Methods:

• High-pressure freezing to instantaneously preserve sample ultrastructure.
• Rapid ice substitution and resin infiltration to create a stable matrix.
• Sectioning for thin-section TEM imaging and electron tomography for 3D reconstruction.

Main Results:

• Preservation of ultrastructural detail with minimized preparation artifacts.
• Enables imaging of virus-host interactions at a cellular level.
• Facilitates 3D reconstruction of thicker sections using electron tomography.

Conclusions:

• The described method offers improved sample preservation for TEM.
• This technique is valuable for studying virus-host interactions and other cellular ultrastructure.
• Minimizing artifacts is crucial for accurate interpretation of TEM data.