Adrenocorticotropic Hormone Causes Long-Lasting Potentiation of Transmitter Release from Frog Motor Nerve Terminals

Abstract
Exposure of frog neuromuscular preparations to adrenocorticotropic hormone for several minutes increased both nerve-evoked and spontaneous transmitter release for several hours. No changes in postsynaptic sensitivity to transmitter were detected. The long-lasting potentiation shows little sensitivity to changes in extracellular calcium concentration and seems to be entirely presynaptic in origin.