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CYTOCHEMICAL LOCALIZATION OF CHOLINESTERASE ACTIVITY IN ADULT RABBIT HEART

MARTIN HAGOPIAN 1 and VIRGINIA M. TENNYSON 2

1 Department of Pathology, New York Medical College, New York, New York 10029
2 Department of Pathology, Division of Neuropathology, College of Physicians and Surgeons, New York, New York 10029

The papillary muscle of the adult rabbit heart was studied by a modification of the Koelle-Friedenwald copper thiocholine technique for the localization of cholinesterase activity. Butyrylcholinesterase (BuChE), identified by its substrate and inhibitor specificity, is found mainly in the terminal sacs of the sarcoplasmic reticulum adjacent to the T system. The localization of the reaction product in this particular site suggests that BuChE may play a role in excitation-contraction coupling in the adult rabbit heart. The present findings are also discussed in comparison with our previous work on the localization of acetylcholinesterase activity in the embryonic rabbit heart.

Submitted on March 12, 1971


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