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Automated 5-plex fluorescent immunohistochemistry with tyramide signal amplification using antibodies from the same species
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  1. Wenjun Zhang1,
  2. Antony Hubbard1,
  3. Tobin Jones1,
  4. Srabani Bhaumik1,
  5. Adriana Racolta1,
  6. Mark Lefever1,
  7. Karl Garsha1,
  8. Nicholas Cummins1,
  9. Franklin Ventura1 and
  10. Lei Tang1
  1. Aff1 grid.418158.10000 0004 0534 4718Roche Diagnostics Tucson AZ USA

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Meeting abstracts

Background

Immunohistochemical (IHC) detection of multiple antigens on the same tissue section represents a major unmet technological need in research and clinical diagnostics. While primary antibodies from different species have been used with differently labeled species-specific secondary antibodies, quite often the appropriate combination of antibodies is not available. More recently, primary antibodies from the same species have been employed for multiplex IHC with microwaving treatment between each antigen staining cycle. This manual microwaving method prevents the cross-reactivity of an anti-species antibody in a subsequent cycle from binding to a primary antibody at the previous cycle.

Methods

We present here a fully automated heat deactivation (HD) process on the BenchMark ULTRA automated slide stainer. We verified various aspects of the HD process: (1) effectiveness for preventing cross-reactivity, (2) impact on the epitopes in tissues, (3) impact on the fluorescence of the fluorophores, and (4) impact on tissue morphology. We further validated an automated 5-plex fluorescent IHC assay for CD3, CD8, CD20, CD68 and FoxP3 on human tonsil tissues.

Results

This automated 5-plex fluorescent IHC assay using rabbit primary antibodies achieved comparable staining results to the respective single-plex chromogenic IHC assays. This technology enables a simple automated multiplex IHC assay through the use of commercially available native primary antibodies with their respective secondary anti-species antibody, and a clinically proven staining platform to ensure staining quality, reliability, and reproducibility.

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