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Relationship between immunostaining intensity and antigen content in sections

J Watanabe1, Y Asaka, S Kanamura

  • 1Department of Anatomy, Kansai Medical University, Moriguchi, Osaka, Japan.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|December 1, 1996
PubMed
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Quantitative immunohistochemistry can measure alpha-fetoprotein (AFP) content in tissue sections. However, albumin content is not reliably measurable due to antigen loss during fixation and staining.

Area of Science:

  • Biochemistry
  • Histology
  • Immunohistochemistry

Background:

  • Immunohistochemistry (IHC) is widely used to assess antigen levels in tissue sections.
  • The accuracy of IHC quantification depends on the relationship between staining intensity and actual antigen content.

Purpose of the Study:

  • To investigate the relationship between staining intensity and antigen content for alpha-fetoprotein (AFP) and albumin in rat liver sections.
  • To determine the reliability of quantitative IHC methods for measuring antigen levels.

Main Methods:

  • Compared image processing (IP) measurements of immunostaining intensity with immunochemical assay measurements of antigen content.
  • Conducted antigen preservation tests to assess antigen loss during fixation.
  • Utilized microphotometric (MP) and IP methods to analyze antigen content and antibody binding.

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Main Results:

  • AFP staining intensity was proportional to antigen content.
  • Albumin staining intensity was not proportional to antigen content.
  • AFP antigenicity decreased proportionally during fixation; albumin showed proportional decrease and disproportionate loss of antibody binding.

Conclusions:

  • Quantitative IHC is suitable for measuring AFP content in tissue sections.
  • Quantitative IHC is not reliable for measuring albumin content due to complex antigen degradation and binding issues.