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Bombesin-induced residual stimulation of amylase release from mouse pancreatic acini.

When dispersed acini from mouse pancreas are first incubated with bombesin, washed, and then reincubated with fresh incubation solution containing no bombesin, there is significant residual stimulation of amylase release. Induction of residual stimulation is relatively rapid in that significant stimulation occurs as early as after 15 s of first incubation with bombesin. Induction of residual stimulation of amylase release per se is temperature independent, but induction does occur more rapidly when acini are first incubated at 37 degrees C than when they are first incubated at 4 degrees C. Residual stimulation of amylase release persists for at least 75 min in acini that have been first incubated with bombesin at 37 degrees C. The maximal residual stimulation of amylase release obtained with pancreatic acini that have been first incubated with bombesin and then washed is 45% greater than the maximal stimulation obtained when bombesin is added directly to the incubation medium. In terms of their abilities to cause residual stimulation of amylase release, litorin and ranatensin are equal to bombesin in potency and efficacy. Gastrin-releasing peptide is approximately 70% as efficacious as bombesin in causing residual stimulation of amylase release.