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Immunoelectron microscopic localization of alpha-actinin on Lowicryl- embedded thin-sectioned tissues

LF Lemanski, DJ Paulson, CS Hill, LA Davis, LC Riles and SS Lim

A procedure has been developed for the immunoelectron microscopic localization of intracellular antigens on thin-sectioned tissues. The tissues were fixed in a periodate-lysine-paraformaldehyde solution or a formaldehyde-glutaraldehyde combination and embedded in the acrylate- methacrylate mixture, Lowicryl K4M (Polaron), which was polymerized under ultraviolet irradiation at -35 degrees C. Thin sections were mounted on gold grids, immunostained using an indirect method with ferritin-labeled antibodies, and, optionally, counterstained with osmium tetroxide and/or lead citrate and uranyl acetate. The procedure provided good morphologic preservation of the cell architecture in adult and embryonic heart, and skeletal and smooth muscle tissue, as well as nonmuscle cells. At the same time it retained the antigenicities of several contractile proteins, including myosin, tropomyosin, actin, and alpha-actinin. The method has advantages over en bloc staining techniques in that the problem of antibody penetration into the cells is eliminated and careful controls can be performed on adjacent sections. This technique will be useful for localizing, at the ultrastructural level, contractile and other selected proteins in a variety of muscle and non-muscle cells. Details of the new protocol and a description of the results of using antibody against the contractile protein, alpha-actinin, are given.

Volume 33, Issue 6, pp. 515-522, 06/01/1985
Copyright © 1985 by The Histochemical Society


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