Summary
A simple and versatile technique for the preparation of ultra-thin sections, which can be stained immunohistochemically directly on electron microscope grids, is presented. An anti-hapten immunoperoxidase procedure has been adapted for use on tissue fixed in a purified monomeric glutaraldehyde-picric acid mixture, and embedded in ‘L R White’, a recently formulated plastic resin. This plastic tolerates the use of partial dehydration of tissue, resulting in higher antigenic yields. In addition, no etching of ultra-thin sections is necessary, and the whole immunostaining procedure can be completed in less than 2 h. A comparison of commonly used fixatives is discussed. High-resolution micrographs showing general staining (uranyl acetate-lead citrate) of rat pancreas, and immunostaining of insulin and TSH in storage granules in perfusion-fixed rat tissue and of lambda-chain immunoreactive cells in immersion-fixed human tonsil are included as examples.
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Newman, G.R., Jasani, B. & Williams, E.D. A simple post-embedding system for the rapid demonstration of tissue antigens under the electron microscope. Histochem J 15, 543–555 (1983). https://doi.org/10.1007/BF01954145
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DOI: https://doi.org/10.1007/BF01954145