Immunoelectron microscopy of tissues processed by rapid freezing and freeze-substitution fixation without chemical fixatives: application to catalase in rat liver hepatocytes [see comments]N Usuda, HJ Ma, T Hanai, S Yokota, T Hashimoto and T Nagata Department of Anatomy and Cell Biology, Shinshu University School of Medicine, Matsumoto, Japan. We report on the immunohistochemical demonstration of an enzyme at the electron microscopic level using specimens processed by rapid freezing and the freeze-substitution technique without the use of any chemical fixatives. Fresh rat liver tissue blocks were rapidly frozen by the metal contact method using liquid nitrogen, and were freeze-substituted with acetone without any chemical fixatives at -80 degrees C. Some of the freeze-substituted tissues were embedded in Lowicryl K4M at -20 degrees C; the others were returned to room temperature and embedded in Epok 812 at 60 degrees C. Ultra-thin sections were stained using anti- peroxisomal catalase antibody by the protein A-gold technique. The ultrastructure of the hepatocytes was very well preserved compared with that of conventionally processed tissues. The labeling for catalase was confined to peroxisomes. When the labeling density was compared among freeze-substituted tissues and conventionally processed tissues, that of freeze-substituted and Lowicryl K4M-embedded tissues was the most intense. These results show the usefulness of freeze-substituted tissues for immunohistochemical analysis of cell organelles.
Volume 38,
Issue 5,
pp. 617-623,
05/01/1990
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J. Rohrbough, E. Rushton, E. Woodruff III, T. Fergestad, K. Vigneswaran, and K. Broadie Presynaptic establishment of the synaptic cleft extracellular matrix is required for post-synaptic differentiation Genes & Dev., October 15, 2007; 21(20): 2607 - 2628. [Abstract] [Full Text] [PDF] |
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R. D. Young, P. A. Lawrence, V. C. Duance, T. Aigner, and P. Monaghan Immunolocalization of Collagen Types II and III in Single Fibrils of Human Articular Cartilage J. Histochem. Cytochem., March 1, 2000; 48(3): 423 - 432. [Abstract] [Full Text] |
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N. Ogiwara, N. Usuda, M. Yamada, K. Johkura, K. Kametani, and A. Nakazawa Quantification of Protein A–Gold Staining for Peroxisomal Enzymes by Confocal Laser Scanning Microscopy J. Histochem. Cytochem., October 1, 1999; 47(10): 1343 - 1349. [Abstract] [Full Text] |
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