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Semi-Quantitative Impacts of Major Step on Antigen in Pre-Treatment Required for Immunohistochemistry by Xinyan Feng, Wenbo Wang, Hui Liu

Background: We investigated the impact of immunohistochemistry (IHC) pre-treatment steps on antigens.
Methods: Salmonella typhimurium was selected as the observed antigen. The antigen was subjected to IHC pre-treatment steps involving a series of reagents, including 10% formaldehyde, ethanol, and xylene. Antigenicity was then measured by agglutination reaction.
Results: The agglutination titer for S. typhimurium was higher in the untreated control group than in the experimental group, indicating that pre-treatment inhibited antigen activity. The inhibitory effect of ethanol was greater than that of 10% formaldehyde and xylene. Unexpectedly, partial antigen recovery can be achieved from a preparation of paraffin section after hydration.
Conclusions: S. Antigens may be strongly inhibited (inhibition: 70.8%) by IHC pre-treatment steps, especially by alcohol treatment. There is an experimental foundation for antigen retrieval in IHC.

DOI: 10.7754/Clin.Lab.2019.190219