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Related Experiment Videos

The effect of fixation on esterases.

S Kirkeby, D Moe

    Acta Histochemica
    |January 1, 1984
    PubMed
    Summary

    Aldehyde fixation alters non-specific esterase activity in glandular tissue, affecting isoenzyme mobility and enabling localized reaction product detection. This method improves visualization of enzyme activity in tissue sections.

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    Area of Science:

    • Biochemistry
    • Histochemistry
    • Enzymology

    Background:

    • Non-specific esterases are enzymes involved in various cellular processes.
    • Understanding enzyme localization is crucial for interpreting tissue function and pathology.
    • Aldehyde fixation is a common technique in tissue preparation, but its effects on enzyme activity require careful evaluation.

    Purpose of the Study:

    • To investigate the impact of aldehyde fixation on the localization and activity of non-specific esterases in glandular tissue.
    • To compare the electrophoretical and histochemical properties of non-specific esterases in fresh versus aldehyde-fixed tissue.
    • To determine if aldehyde fixation enhances the detection of non-specific esterase reaction products.

    Main Methods:

    • Electrophoretical analysis of non-specific esterases from fresh and aldehyde-treated glandular tissue.
    • Histochemical staining of tissue sections to visualize the localization of reaction product.
    • Comparative analysis of enzyme activity and isoenzyme profiles before and after fixation.

    Main Results:

    • Electrophoresis revealed selective inhibition of specific isoenzymes and altered band mobility due to aldehyde fixation.
    • Histochemical staining demonstrated a granular reaction product in formaldehyde-fixed tissue sections after 5 minutes.
    • No comparable staining was observed in fresh, unfixed tissue, indicating enhanced detection with fixation.

    Conclusions:

    • Aldehyde fixation, specifically with formaldehyde, significantly impacts non-specific esterase isoenzyme profiles.
    • Formaldehyde fixation facilitates the detection and localization of non-specific esterase reaction products in glandular tissue sections.
    • The study highlights the utility of aldehyde fixation for improved histochemical visualization of non-specific esterase activity.

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