Combined video fluorescence and 3D electron microscopy.

Area of Science:

• Cell Biology
• Microscopy Techniques

Background:

• Electron microscopy (EM) provides high-resolution 3D cell structures but captures static averages, missing dynamic events.
• Live-cell imaging using light microscopy tracks cellular dynamics but lacks EM's resolution.
• Current methods struggle to link fast, rare cellular events to molecular mechanisms.

Purpose of the Study:

• To describe a correlative light and electron microscopy (CLEM) technique.
• To enable the study of dynamic cellular processes at high resolution.
• To combine the advantages of in vivo fluorescence microscopy and EM.

Main Methods:

• Transfecting cells with fluorescently tagged proteins.
• Live imaging using fluorescence microscopy.
• Cell fixation, immunolabeling, embedding, serial sectioning, and EM observation.

Main Results:

• The described CLEM technique allows precise localization of cellular events observed in vivo.
• It enables detailed ultrastructural analysis of dynamic processes previously unobservable with EM alone.
• The method facilitates answering specific biological questions by bridging live-cell dynamics and high-resolution structure.

Conclusions:

• Correlative light and electron microscopy (CLEM) is essential for studying dynamic cellular events.
• This technique overcomes the resolution and temporal limitations of individual microscopy methods.
• Successful application requires specific know-how for sample preparation and imaging.