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Related Experiment Videos

Antigen retrieval on formaldehyde-fixed paraffin sections: its potential drawbacks and optimization for double

T Ezaki1

  • 1Department of Anatomy II, Kumamoto University, School of Medicine, 2-2-1 Honjo, 860-0811, Kumamoto, Japan. ezakit@kaiju.medic.kumamoto-u.ac.jp

Micron (Oxford, England : 1993)
|June 6, 2000
PubMed
Summary

Formaldehyde fixation masks antigens, but new methods can unmask them. A combined mild heating and pepsin digestion technique effectively retrieves antigens for immunostaining without background noise.

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Area of Science:

  • Immunohistochemistry
  • Biochemistry
  • Cell Biology

Background:

  • Formaldehyde fixation causes antigen masking by cross-linking proteins.
  • Antigen retrieval techniques aim to recover immunoreactivity in fixed tissues.
  • Common methods like heat-induced epitope retrieval and enzyme digestion have limitations.

Purpose of the Study:

  • To review practical issues with heat-induced epitope retrieval and enzyme digestion.
  • To propose a novel combined technique for improved antigen retrieval.
  • To optimize immunostaining for proliferating cell nuclear antigen (PCNA).

Main Methods:

  • Review of heat-induced epitope retrieval and enzyme digestion methods.
  • Development of a combined mild heating (80°C microwave for 15-20 min) and pepsin digestion technique.

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  • Application of the new technique for PCNA immunostaining on formaldehyde-fixed paraffin-embedded sections.
  • Adaptation for double immunostaining with various markers.

    • Main Results:

    • Severe heating conditions in epitope retrieval can cause false-positive and background staining.
    • The new combined technique achieved strong, specific PCNA immunoreactivity.
    • The procedure successfully avoided undesirable false positive or background staining.
    • The method was effective for double immunostaining with multiple markers.

    Conclusions:

    • Antigen retrieval procedures can also denature proteins, impacting results.
    • A combination of mild heating and pepsin digestion offers an effective solution for antigen retrieval.
    • This optimized method enhances specificity and reduces background in immunostaining.