An Improved Protocol of Biotinylated Tyramine-based Immunohistochemistry Minimizing Nonspecific Background StainingSeok Hyung Kima,b, Young Kee Shina,b, Kyung Mee Leeb, Jung Sun Leeb, Ji Hye Yunb, and Sun Myung Leeba Department of Pathology, Seoul National University College of Medicine, Seoul, Korea b DiNonA, Inc., Seoul, Korea Correspondence to: Seok Hyung Kim, DiNonA Inc., 65 Umyeon-dong, Seo-cho Gu, Seoul, South Korea 137-140. E-mail: platoshkim@freechal.com An immunohistochemical method using biotinyl tyramine was recently introduced to amplify weak staining signals. Despite its high sensitivity, however, tyramine-based immunostaining has been limited by its increased background staining. In this study, to develop an improved protocol of biotinyl tyramine-based immunohistochemistry minimizing the background staining, we determined which staining steps lead to the nonspecific reaction and the most appropriate blocking agents for background-provoking steps. Trypton casein peptone and distilled water with Tween-20 were shown to be most effective as a blocking agent and a rinsing solution, respectively. In conclusion, we developed an optimized protocol for biotinyl tyramine-based immunohistochemistry with minimal background staining. (J Histochem Cytochem 51:129132, 2003) Key Words: immunohistochemistry, tyramine, background staining
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