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Published on: July 26, 2019
High sensitivity and reproducibility of immunohistochemistry with microagitation
Ingo Nindl1, Andreas Toegl, Wolfram Sterry
1Charité, Department of Dermatology, 10117 Berlin, Germany. ingo.nindl@charite.de
Insights
Classical immunohistochemistry (IHC) was compared with IHC using microagitation. Microagitation demonstrated improved reproducibility and sensitivity, allowing higher antibody dilutions for Ki-67 and p53 markers in skin cancer biopsies.
Area of Science:
- Biopathology
- Immunohistochemistry Techniques
Background:
- Classical immunohistochemistry (IHC) is a standard diagnostic tool.
- Optimizing IHC protocols for enhanced sensitivity and reproducibility is crucial for accurate biomarker analysis.
Purpose of the Study:
- To evaluate the practicability, reproducibility, and analytical sensitivity of classical IHC versus IHC with microagitation.
- To assess the performance of Ki-67 and p53 antibody staining using both IHC methods.
Main Methods:
- Comparative analysis of classical IHC and IHC with microagitation.
- Utilized monoclonal antibodies Ki-67 (proliferation) and p53 (tumor suppressor) on paraffin-embedded non-melanoma skin cancer biopsies.
- Assessed reproducibility through three independent experiments and analytical sensitivity via serial dilutions.
Main Results:
- IHC with microagitation was feasible without tissue damage.
- The microagitation technique demonstrated high consistency and reproducibility with no background staining.
- Antibodies (Ki-67, p53) could be used at 4-10 times higher dilutions with microagitation compared to classical IHC.
Conclusions:
- Microagitation is a viable, reproducible, and highly sensitive method for immunohistochemistry.
- This technique allows for increased antibody dilutions, potentially reducing costs and improving signal-to-noise ratio.
- Further investigation of microagitation with diverse antibodies is recommended.
Abstract:
We examined the practicability, reproducibility and analytical sensitivity of classical immunohistochemistry (IHC) and IHC with microagitation. Two monoclonal antibodies, Ki-67 (proliferation marker) and p53 (tumor suppressor marker), were used. Consecutive paraffin sections of biopsies of suspicious lesions of patients with non-melanoma skin cancer were used in the study. Reproducibility was examined using specimens from four patients in three independent experiments with antibodies against Ki-67 and p53. Analytical sensitivity of the two methods was determined using serial dilutions in two independent experiments. IHC with microagitation could be carried out without destroying the tissue. The new technique was consistent and reproducible, and no background staining was observed. The primary antibodies Ki-67 and p53 could be used at higher dilutions (four to ten times) with microagitation compared with classical IHC. Microagitation can be used for immunohistochemistry; it was reproducible, highly sensitive, and antibodies could be used at higher dilutions. Further analyses with other antibodies using this technique are warranted.
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