Quick sampling and perpendicular cryosectioning of cell monolayers for the X-ray microanalysis of diffusible elements

Area of Science:

• Cell Biology
• Biophysics
• Analytical Chemistry

Background:

• Standard methods for preparing cell monolayers for analysis can involve harsh treatments.
• Preserving cellular integrity during sample preparation is crucial for accurate elemental composition analysis.
• Existing methods may alter the natural elemental ratios within cells.

Purpose of the Study:

• To develop a rapid and gentle method for freezing cell monolayers for elemental analysis.
• To minimize sample manipulation and potential artifacts introduced during preparation.
• To validate the preservation of elemental composition in cryopreserved cell monolayers.

Main Methods:

• Cells grown on Formvar film supported by polystyrene frames.
• Application of polyvinylpyrrolidone (PVP) solution to the cell-bearing film.
• Rapid freezing of the PVP-treated film using liquid nitrogen-cooled pliers.
• Elemental analysis of frozen samples, with potential use of PVP as an elemental standard.

Main Results:

• The method allows for quick sample preparation, with freezing completed within 30 seconds.
• The polyvinylpyrrolidone (PVP) solution strengthens the frozen cell specimen.
• Analytical results showed low and stable sodium-to-potassium (Na:K) ratios.
• Elemental composition of in vitro cells was found to be comparable to cells in vivo.

Conclusions:

• The described method offers a fast and gentle approach for preparing cell monolayers for elemental analysis.
• This technique effectively preserves the native elemental composition of cells.
• The findings support the comparability of elemental profiles between in vitro and in vivo cells.