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Applications of immunohistochemistry in the evaluation of immunosuppressive agents

N A Gillett1, C Chan

  • 1Sierra Biomedical, Inc., Sparks, Nevada 89431, USA.

Human & Experimental Toxicology
|August 3, 2000
PubMed

Insights

Immunohistochemistry (IHC) enhances detection of lymphocyte changes in tissues, aiding immunosuppressive agent studies. Combining IHC with flow cytometry clarifies if blood alterations reflect tissue distribution or cell trafficking.

Area of Science:

  • Toxicology
  • Immunology
  • Histopathology

Background:

  • Immunohistochemistry (IHC) offers superior sensitivity over conventional histology for detecting subtle changes in lymphocyte populations within tissues.
  • Assessing lymphocyte distribution and numbers in tissues is crucial for evaluating the effects of immunosuppressive agents.

Purpose of the Study:

  • To highlight the utility of immunohistochemistry (IHC) as an endpoint for evaluating lymphocyte subpopulations in tissues.
  • To demonstrate how IHC, in conjunction with flow cytometry, can differentiate between cell trafficking and tissue distribution changes.
  • To explore the application of these techniques in reproductive toxicology studies, including fetal tissues.

Main Methods:

  • Immunohistochemistry (IHC) was employed to analyze lymphocyte subpopulations in tissue samples.
  • Flow cytometry was utilized for the analysis of peripheral blood lymphocyte subpopulations.
  • Comparative analysis was performed between tissue-based IHC and peripheral blood flow cytometry data.

Main Results:

  • IHC demonstrated higher sensitivity than conventional histology in identifying alterations in lymphocyte numbers and tissue distribution.
  • The combined approach of IHC and flow cytometry successfully distinguished between lymphocyte trafficking and changes in tissue distribution.
  • The methods proved applicable for evaluating both adult animals and fetal tissues in toxicological assessments.

Conclusions:

  • Immunohistochemistry is a valuable tool for assessing lymphocyte changes in tissues, particularly when evaluating immunosuppressive agents.
  • Integrating IHC with flow cytometry provides a comprehensive understanding of immune system alterations.
  • Further evaluation of additional immune function endpoints is necessary to determine the full biological significance of observed changes.

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