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Journal of Histochemistry and Cytochemistry, Vol. 51, 995-1003, August 2003, Copyright © 2003, The Histochemical Society, Inc.

ARTICLE

Antigen Retrieval by Heating En Bloc for Pre-fixed Frozen Material

Hidetoshi Inoa
a Department of Neurobiology (C1), Graduate School of Medicine, Chiba University, Chiba, Japan

Correspondence to: Hidetoshi Ino, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan. E-mail: ino@med.m.chiba-u.ac.jp

Antigen retrieval (AR) is frequently required for successful immunohistochemistry (IHC) in archival formalin-fixed, paraffin-embedded tissue sections. Although AR by heating is most generally used, the majority of existing methods are useful only for paraffin-embedded sections. This article describes a simple alternative method for AR that can be used for aldehyde-fixed frozen sections. After fixation in paraformaldehyde, tissue blocks were heated in retrieval solutions and then frozen with dry ice. The optimal temperatures for heating were 90C and above, and the optimal retrieval solutions were distilled water and 10 mM sodium citrate, pH 6.0. Sections were cut with a cryostat and mounted on poly-L-lysine-coated glass slides. After the sections dried, routine IHC was performed. Alternatively, free-floating sections were used. This method not only greatly enhanced the immunoreactivity for a wide range of antigens, especially for nuclear proteins, but also effectively lowered the background staining in some cases. I examined the staining of 14 antibodies using sections of mouse brain and rat testis. The heating process was essential for five antibodies, improved immunoreactivity for seven antibodies, and provided no change for two antibodies. (J Histochem Cytochem 51:995–1003, 2003)

Key Words: antigen retrieval, immunohistochemistry, frozen section, CDK5, ROR{alpha}, PCNA, cyclin-dependent kinase


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