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Ultrastructural localization of acetylcholinesterase in cultured cells. I. Embryo muscle

HR Sawyer, TK Golder, PS Nieberg and BW Wilson

Several techniques were employed to examine the localization of acetylcholinesterase (EC 3.1.1.7, AChE) in cultured chick embryonic skeletal muscle. Glutaraldehyde produced the best cellular preservation but less enzyme activity was lost when the cells were fixed in paraformaldehyde. Two staining methods were examined: in one (Karnovsky MJ, Roots L: J Histochem Cytochem 12:219, 1964) potassium ferricyanide was added with the primary reactants, and in the other (Tsuji S: Histochemistry 42:99, 1974) the potassium ferricyanide was added at the end of the staining procedure. Localizations of AChE were similar with both stains; activity was present in the nuclear envelope, the perinuclear sarcoplasm, the sarcoplasmic reticulum, subsurface vesicles and bound outside the cells. /owever, a granular artifact was found with the method of Karnovsky and Roots that did not appear with the method of Tsuji. The localization of AChE are consistent with kinetic data that AchE binds, moves and is released from cultured muscle fibers.

Volume 24, Issue 9, pp. 969-978, 09/01/1976
Copyright © 1976 by The Histochemical Society


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