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A method for staining actin-containing structures in thick plastic sections for medium voltage electron microscopy.

J M Smith

    Tissue & Cell
    |January 1, 1984
    PubMed
    Summary
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    A new staining method images actin structures in electron microscopy. This technique enhances visibility of stress fibers in plastic-embedded cells for detailed ultrastructural analysis.

    Area of Science:

    • Cell Biology
    • Microscopy Techniques
    • Biochemistry

    Background:

    • Actin-based structures, such as stress fibers, are crucial for cell adhesion and migration.
    • Imaging these structures in thick plastic sections for electron microscopy (EM) presents challenges due to low inherent contrast.

    Purpose of the Study:

    • To develop a novel staining procedure for enhanced visualization of actin-containing structures in thick plastic sections for EM.
    • To characterize stress fibers in a fibroblastic cell line using immunocytochemistry and the new staining method.

    Main Methods:

    • Cells were fixed with formaldehyde.
    • A multi-step staining protocol involving gadolinium chloride mordanting and haematoxylin staining was employed.
    • Post-staining with ammonium paramolybdate enhanced electron density for EM imaging.

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    Main Results:

    • The developed staining procedure successfully visualized actin stress fibers in 1-micron thick plastic sections.
    • Haematoxylin-stained structures achieved sufficient electron density after ammonium paramolybdate treatment.
    • Imaging was feasible in a JEOL 200CX electron microscope at 200 kV and potentially in conventional EM instruments.

    Conclusions:

    • This staining method provides a reliable approach for imaging actin structures in thick plastic sections using electron microscopy.
    • The technique offers improved contrast and detail for studying cellular ultrastructure, particularly stress fibers.