Abstract
Amylase release from mouse parotid fragments was stimulated independently by cholinergic and beta-adrenergic agents. The cholinergic agonist, carbachol, significantly increased release of amylase only in Ca2+ containing medium whereas isoproterenol-stimulated amylase release was unaffected by Ca2+ removal. The ionophore, A23187, mimicked the effect of cholinergic stimulation when Ca2+ was present in the medium. Uptake of 45Ca2+ into tissue fragments was enhanced by carbachol and A23187 but not by isoproterenol; atropine blocked the effect of carbachol. Diphenylhydantoin (DPH) and verapamil partially inhibited carbachol-stimulated amylase release and 45Ca2+ uptake, whereas diazoxide potentiated these effects; in all cases there was good parallelism between 45Ca2+ uptake and amylase release. It was concluded that the primary step in the release of amylase from mouse parotid gland in response to cholinergic agents is an increased influx of Ca2+.
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