Immunogold labelling in environmental scanning electron microscopy: applicative features for complementary...

Area of Science:

• Electron Microscopy
• Cell Biology
• Diagnostic Pathology

Background:

• Fine needle aspiration (FNA) is crucial for diagnosing thyroid nodules.
• Current methods for analyzing FNA samples have limitations in visualizing both cell morphology and surface proteins simultaneously.
• Environmental scanning electron microscopy (ESEM) offers advantages for biological sample analysis due to its less stringent vacuum requirements.

Purpose of the Study:

• To combine ESEM with immunogold labelling (IGL) and Thin Prep technology for analyzing human FNA samples.
• To evaluate the preservation of cell morphology and the clarity of surface protein detection using this combined technique.
• To assess the potential of ESEM-IGL as a diagnostic tool for pre-surgical evaluation.

Main Methods:

• Human FNA samples from thyroid nodules were processed using Thin Prep technology to create uniform cell monolayers.
• Samples were analyzed using environmental scanning electron microscopy (ESEM) combined with immunogold labelling (IGL).
• Optimization of ESEM conditions (vacuum pressure, temperature, humidity) was performed.

Main Results:

• The combined ESEM-IGL and Thin Prep method successfully preserved cell morphology in FNA samples.
• Clear immunogold labelling of cell surface proteins was achieved.
• ESEM provided morphological and compositional information, enhancing diagnostic potential.

Conclusions:

• The combination of ESEM-IGL and Thin Prep technology is a viable method for analyzing cell morphology and surface proteins in FNA samples.
• This technique offers a powerful new diagnostic tool for pre-surgical evaluation of thyroid nodules.
• ESEM-IGL opens new applications for electron microscopy in cytopathology.