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The mechanism of amylase and sialic acid releases stimulated by pilocarpine or high K+ medium was investigated in the slices of dog submandibular glands. The release of both amylase and sialic acid was dose-dependently increased by pilocarpine and a considerable release was observed at pilocarpine concentrations of more than 1 microM. Similar effects were observed when K+ concentration in the medium was increased and the maximal response was observed at 75 mM K+. The release of amylase and sialic acid by pilocarpine or K+ considerably decreased by removing Ca2+ from the medium and the slices. The release of amylase in the Ca2+-deficient slices was nearly recovered by the addition of 2.5 and 5.0 mM Ca2+, whereas that of sialic acid was recovered by only 60-75%. Ca2+ inhibitors, La3+ and verapamil, and calmodulin inhibitors, trifluoperazine, prenylamine, and W-7, significantly inhibited the release of amylase and sialic acid induced by the stimulants. These results suggest that the release of amylase and sialic acid stimulated by pilocarpine or K+ is dependent on the presence of Ca2+, and that the activation of calmodulin is involved in the process of the release.

the japanese journal of physiology

Stimulation of amylase and sialic acid releases from dog submandibular gland slices by pilocarpine or high K+ medium: A possible role of calmodulin for their releases.