Applications of Plastic Embedding to Electron Microscopic Immunocytochemistry and In Situ Hybridization in Observations of Production and Secretion of Peptide HormonesR. Yoshiyuki Osamuraa, Yoshiko Itoha, and Akira Matsunoaa Department of Pathology, Tokai University School of Medicine, and Department of Neurosurgery, Teikyo University Ichihara Hospital, Kanagawa, Japan Correspondence to: R. Yoshiyuki Osamura, Dept. of Pathology, Tokai University School of Medicine, Boseidai Isehara-city, Kanagawa, Japan 259-1193. E-mail: osamura@is.icc.u-tokai.ac.jp Plastic embedding has been used to localize various antigens in conjunction with immunohistochemistry. Peptide hormones have been among the antigens that have been studied extensively. Recent application of water-soluble plastics such as LR White and Lowicryl has extended the ranges of detectable antigens and enabled the observation of antigenantigen or mRNAantigen combinations. This review article deals with technical aspects, procedures, and applications in endocrine cells. (J Histochem Cytochem 48:885891, 2000) Key Words: immunohistochemistry, in situ hybridization, electron microscopy, plastic embedding, peptide hormones, secretory pathway, secretory granules, messenger RNA, regulated pathway, constitutive pathway
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