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The effect of infused acetylcholine and (2-acetyllactoyloxyethyl)-trimethylammonium hemi-1,5-naphthalenedisulfonate (aclatonium napadisilate), a new cholinergic drug . On endocrine and exocrine secretory responses was simultaneously investigated during the perfusion of isolated rat pancreases. Acetylcholine (1.1 microM) stimulated the output of pancreatic juice and amylase, and significantly elicited the production of both insulin and glucagon. Its effect on somatostatin secretion, however, was minimal. Both pancreatic juice flow and amylase output were also significantly stimulated by aclatonium napadisilate (12 microM). These stimulatory effects of aclatonium napadisilate on the exocrine pancreas were blocked by atropine (25 microM). Aclatonium napadisilate could stimulate glucagon, but could not influence insulin and somatostatin secretion. The addition of atropine had no effect on the release of insulin, glucagon, and somatostatin. These results indicate that the effects of aclatonium napadisilate is cholinergic, and that the action is muscarinic. In addition, it can be concluded that pancreatic somatostatin secretion, as well as other hormones from islet cells, is controlled by the parasympathetic nervous system.
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