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Related Experiment Videos

Enzyme-based antigen localization and quantitation in cell and tissue samples (Midwestern assay)

K A Roth1, J W Brenner, L A Selznick

  • 1Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.

The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
|February 12, 1998
PubMed
Summary

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A new assay allows simultaneous antigen localization and quantitation in cells and tissues without extraction. This method, the Midwestern assay, offers a sensitive and rapid approach for analyzing antigen concentration and distribution.

Area of Science:

  • Biochemistry
  • Immunohistochemistry
  • Cell Biology

Background:

  • Traditional methods for antigen quantitation and localization in biological samples are often mutually exclusive.
  • Antigen extraction for quantitation prevents localization, while immunolocalization offers limited quantitative data.

Purpose of the Study:

  • To develop a novel assay for simultaneous antigen localization and quantitation in cell and tissue samples.
  • To overcome the limitations of existing methods by avoiding antigen extraction and image analysis.

Main Methods:

  • Developed the Midwestern assay using fixed cells/tissue sections with antigen-specific enzyme-linked probes.
  • Generated soluble reaction products for spectrophotometric quantitation and deposited products for microscopic localization.

Related Experiment Videos

  • Controlled variables like probe specificity and reaction time to ensure product proportionality to antigen concentration.

    • Main Results:

    • Demonstrated simultaneous antigen localization and quantitation without radioactive materials or complex image analysis.
    • Showed a clear relationship between the assay's results and visually determined Ki-67 cell labeling indexes in human brain tumors.
    • Validated the assay's sensitivity and speed for antigen analysis.

    Conclusions:

    • The Midwestern assay provides a rapid, sensitive, and versatile method for simultaneous antigen localization and quantitation.
    • This assay is applicable to a wide range of antigens in both clinical and research settings.
    • Offers a significant advancement over existing techniques for biological sample analysis.