[Action of acetylcholine on the adenosine triphosphatase activity of the brain synaptosomes of the suslik, Citellus erythrogenus].

In experiments in vitro at 37 and 17 degrees C, studies have been made of the effect of ACh upon the activity of Mg- and Na,K-ATPase of brain synaptosomes of the ground squirrel in summer animals and during winter hibernation. ACh (6 mM) decreases the activity of ATPases by 23-33% at 37 degrees C. During winter hibernation, the inhibitory effect of ACh is increased resulting in lower values of residual ATPase activity after the effect of ACh as compared with those obtained in summer period.