Antigen retrieval techniques in immunohistochemistry: Comparison of different methods

Stefano A. Pileri, Giovanna Roncador, Claudio Ceccarelli, Milena Piccioli, Aspasia Briskomatis, Elena Sabattini, Stefano Ascani, Donatella Santini, Pier Paolo Piccaluga, Ornella Leone, Stefania Damiani, Cesarina Ercolessi, Federica Sandri, Federica Pieri, Lorenzo Leoncini, Brunangelo Falini

Research output: Contribution to journalArticlepeer-review


Routine sections of normal and pathological samples fixed in 10 per cent buffered formalin or B5, including EDTA-decalcified bone-marrow biopsies, were tested with 61 antibodies following heating in three different fluids: 0·01 M citrate buffer (pH 6·0), 0·1 M Tris-HCl (pH 8·0), and 1 mM EDTA- NaOH solution (pH 8·0). The sections underwent either three cycles of microwave treatment (5 min each) or pressure cooking for 1-2 min. The alkaline phosphatase/anti-alkaline phosphatase (APAAP) technique was used as the standard detection method; with 16 antibodies a slightly modified streptavidin-biotin complex (SABC)-immunoperoxidase technique was applied in parallel. The results obtained were compared with those observed without any antigen retrieval (AR), or following section digestion with 0·05 per cent protease XIV at 37°C for 5 min. Chess-board titration tests showed that all antibodies but one profited by AR. Protease XIV digestion represented the gold Standard for five antibodies, while 55 produced optimal results following the application of heat-based AR. By comparison with the other fluids, EDTA appeared to be superior in terms of both staining intensity and the number of marked Cells. These results were independent of tissue processing, immunohistochemical approach, and beating device. Pressure cooking was found to be more convenient on practical grounds, as it allowed the simultaneous handling of a large number of slides and a time saving of 1 min 30 s, representing the proper time for the treatment.

Original languageEnglish
Pages (from-to)116-123
Number of pages8
JournalJournal of Pathology
Issue number1
Publication statusPublished - Sep 1997


  • Antigen retrieval
  • Fixation
  • Immunohistochemistry
  • Standardization

ASJC Scopus subject areas

  • Pathology and Forensic Medicine


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