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The mean miniature end-plate potential (m.e.p.p.) frequency and the acetylcholinesterase (AChE) activity have been examined in the rat diaphragm, in relation to the time of Li+ action. Substitution of LiCl for NaCl caused increase in m.e.p.p. frequency, the final level of which depended on Li+ concentration in the bath solution. Incubation of diaphragm homogenate with NaCl caused initially a slight increase of AChE activity, reaching a plateau after 20 min. Substitution of LiCl for NaCl produced an increase in AChE activity to a maximum, followed by a decrease to a minimum. The activity consequently returned to a steady level. During complete substitution of LiCl for NaCl, the maximum value of AChE activity coincided with the maximum m.e.p.p. frequency (Fmax) induced by Li+; the minimum value correlated with the precise instant that the frequency reached a plateau. The addition of prostigmine caused: a) blockade of AChE activity, and b) prostigmine concentration-dependent decrease of Fmax and/or disappearance of m.e.p.p.s from neuromuscular junctions treated with Li+. These results are discussed in terms of correlation between changes of AChE activity induced by Li+ and variations of spontaneous quantal release of the transmitter from nerve terminals of the rat diaphragm treated with Li+.

Time dependence of Li+ action on acetylcholinesterase activity in correlation with spontaneous quantal release of acetylcholine in rat diaphragm.