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Unstained cell imaging: Morphological insights from coupled fixation and darkfield microscopy
Alessio Gnerucci1, Paola Faraoni1, Giovanni Romano1
1Department of Experimental and Clinical Biomedical Sciences "Mario Serio", Viale Pieraccini 6, 50139, Florence, Italy.
Acta Histochemica
|November 29, 2018
Summary
Darkfield microscopy (DM) with varied fixation protocols offers a cost-effective alternative to traditional cell staining. This method enhances cellular structures, providing valuable morphological insights without altering samples with foreign molecules.
Area of Science:
- Cell Biology
- Microscopy Techniques
- Histology
Background:
- Traditional cell staining methods are costly, time-consuming, and can alter cell samples.
- There is a need for faster, cheaper, and less invasive methods for visualizing cell structures.
Purpose of the Study:
- To evaluate darkfield microscopy (DM) combined with various fixation protocols as an alternative to cell staining.
- To demonstrate how different fixation methods enhance specific cellular structures in DM.
- To correlate DM images with established fluorescent staining for specific cell districts.
Main Methods:
- Analysis of human cell lines using darkfield microscopy.
- Application of diverse chemical fixation protocols to cell samples.
- Comparison of DM images with selective fluorescent staining (nucleus, membrane, cytoskeleton).
Main Results:
- Cell morphology in DM images varied significantly based on the fixation protocol used.
- Fixation protocols altered the local scattering coefficient, influencing contrast and luminosity in DM images.
- DM, with appropriate fixation, could highlight specific cellular structures (e.g., nucleus, membrane, cytoskeleton) comparable to fluorescent staining.
Conclusions:
- Darkfield microscopy combined with optimized fixation offers a simpler, cheaper, and faster approach for morphological analysis.
- This technique provides valuable morphological indications, serving as a support or alternative to traditional staining methods.
- DM can effectively enhance specific cellular districts, aiding in cell structure identification at various magnifications.
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