Chemical Fixation, Immunofluorescence, and Immunogold Labeling of Electron Microscopical Sections

Area of Science:

• Cell Biology
• Molecular Biology
• Microscopy Techniques

Background:

• Spatiotemporal distribution of cellular molecules is crucial for understanding cell function.
• Immunolabeling, utilizing specific antibodies, is a common technique to visualize molecular components.
• Immunofluorescence microscopy provides a broad overview, while electron microscopy offers high-resolution subcellular localization.

Purpose of the Study:

• To describe routine methods for immunofluorescence and electron microscopy-based immunolabeling.
• To provide protocols for chemical fixation, embedding, and sectioning of resin-embedded materials.
• To enable detailed analysis of molecule distribution patterns at the subcellular level.

Main Methods:

• Immunofluorescence microscopy for broad molecular distribution overview.
• Electron microscopy for high-resolution subcellular localization of molecules.
• Antibody conjugation to colloidal gold for labeling ultrathin sections of resin-embedded material.
• Protocols for chemical fixation, embedding, and sectioning.

Main Results:

• Established routine methods for immunofluorescence and electron microscopy immunolabeling.
• Detailed protocols for sample preparation including fixation, embedding, and sectioning.
• Demonstrated the utility of these techniques for analyzing subcellular molecule distribution patterns.

Conclusions:

• Immunofluorescence and electron microscopy are indispensable tools for studying molecular localization in cells.
• The described methods provide a foundation for detailed spatiotemporal analysis of molecular distribution.
• Accurate mapping of molecules enhances understanding of cellular functions and processes.