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Related Experiment Videos

A new fluorescence method for alkaline phosphatase histochemistry.

G I Murray1, S W Ewen

  • 1Department of Pathology, University of Aberdeen, United Kingdom.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|December 1, 1992
PubMed
Summary

A new fluorescence method accurately localizes alkaline phosphatase activity in human tissues. This technique uses calcium-binding fluorochromes for precise enzyme mapping, enabling multi-enzyme analysis in single sections.

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Area of Science:

  • Biochemistry
  • Histochemistry
  • Cell Biology

Background:

  • Alkaline phosphatase is a crucial enzyme in various physiological processes.
  • Accurate histochemical localization of enzyme activity is essential for biological research.
  • Existing methods for alkaline phosphatase detection may have limitations in specificity or resolution.

Purpose of the Study:

  • To develop and validate a novel fluorescence-based histochemical method for alkaline phosphatase (AP) activity.
  • To assess the efficacy of different calcium-binding fluorochromes (calcein, calcein blue, xylenol orange) in this method.
  • To evaluate the method's suitability for co-localization studies of multiple enzymes.

Main Methods:

  • A single-step fluorescence method was developed, incorporating calcium-binding fluorochromes into the alkaline phosphatase incubating medium.

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  • The method utilizes Gomori-type reaction principles, identifying calcium phosphate deposits with fluorochromes.
  • Human liver and jejunal biopsies, processed via freeze-substitution and resin embedding, were analyzed.

    • Main Results:

    • Calcein, calcein blue, and xylenol orange produced distinct green, blue, and red fluorescence, respectively, at sites of AP activity.
    • The method achieved accurate localization of enzyme activity without diffusion artifacts.
    • No non-enzyme-catalyzed binding of fluorochromes to tissue was observed.

    Conclusions:

    • The developed fluorescence method provides a sensitive and specific tool for alkaline phosphatase histochemistry.
    • This technique allows for precise spatial localization and multicolor visualization of enzyme activity.
    • The method is highly suitable for investigating the distribution and co-localization of multiple enzymes within the same tissue section.