Separation of epoxy-embedded cell cultures from plastic flasks for electron microscopy

Area of Science:

• Cell biology
• Histology
• Electron microscopy

Background:

• Standard cell culture often involves complex fixation and embedding processes.
• Existing methods can be labor-intensive and may introduce artifacts.
• In situ embedding offers potential for streamlined sample preparation.

Purpose of the Study:

• To develop an improved method for preparing cell monolayers for microscopy.
• To facilitate easier detachment of embedded cells from culture vessels.
• To enable horizontal ultrathin sectioning of cell monolayers.

Main Methods:

• Cell monolayers were cultured in standard plastic flasks.
• Cells were fixed and embedded "in situ" using Epon resin.
• Polymerization was performed at a reduced temperature (40°C) for 4 days.
• The Epon sheet containing cells was detached from the flask.
• The detached Epon sheet was examined using light microscopy.
• Horizontal ultrathin sectioning was performed on preselected areas.

Main Results:

• Lowering the Epon polymerization temperature to 40°C facilitated easy detachment of the Epon sheet from the plastic flask.
• The detached Epon sheet served as a viable histological preparation.
• Horizontal ultrathin sectioning of preselected areas within the Epon sheet was successfully achieved.

Conclusions:

• This modified Epon polymerization technique simplifies the preparation of cell monolayers for microscopy.
• The method allows for direct observation and horizontal sectioning of cells in their culture substrate.
• This approach offers a valuable alternative for histological analysis of cell monolayers.