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Photoconversion of CFP to study neuronal tissue with electron microscopy
1Center of Anatomy, Department Anatomy and Embryology, University Medical Center Göttingen, Kreuzbergring 36, 37075, Göttingen, Germany, Nina.wittenmayer@med.uni-goettingen.de.
Methods in Molecular Biology (Clifton, N.J.)
|April 11, 2014
Summary
Combining light and electron microscopy allows researchers to visualize dynamic cellular processes and subcellular structures. This study details a straightforward method using cyan fluorescent protein (CFP) and diaminobenzidine (DAB) for high-resolution imaging of neurons.
Area of Science:
- Cell Biology
- Neuroscience
- Microscopy Techniques
Background:
- Correlating dynamic cellular processes with subcellular structures is crucial for understanding cell function.
- Traditional microscopy methods offer either dynamic information (light microscopy) or high-resolution structural details (electron microscopy), but not both on the same sample.
- Bridging this gap requires innovative techniques to combine live-cell imaging with ultrastructural analysis.
Purpose of the Study:
- To present a straightforward method for combining light microscopy and electron microscopy on the same biological sample.
- To enable the tracing and localization of specific proteins within cellular compartments using fluorescence.
- To achieve high-resolution ultrastructural analysis of the same cellular structures.
Main Methods:
- Utilizing cyan fluorescent protein (CFP) for fluorescence-based protein localization.
- Employing photoconversion of diaminobenzidine (DAB) triggered by CFP fluorescence.
- Applying electron microscopy to image the DAB-labeled structures at high resolution.
- Focusing on proteins localized to the Golgi apparatus in primary hippocampal neurons.
Main Results:
- Successfully demonstrated the photoconversion of DAB using CFP-tagged proteins.
- Enabled the precise localization of CFP-tagged proteins within the Golgi apparatus via light microscopy.
- Achieved high-resolution electron microscopy imaging of the same neuronal samples, revealing detailed subcellular structures.
- Validated the combined approach for correlative light and electron microscopy (CLEM).
Conclusions:
- The described method provides a versatile and straightforward approach for correlative light and electron microscopy.
- This technique allows for the simultaneous study of dynamic molecular localization and ultrastructure in neurons.
- The combination of CFP-based photoconversion and DAB staining offers a powerful tool for advanced cell biology research.
