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Adenylate cyclase activity in the parotid gland of the mouse after isoproterenol stimulation

NW Revis and JP Durham

Previous studies have described a decrease in the activity of adenylate cyclase in the parotid gland of isoproterenol-treated rats. In the present studies, a similar decrease was observed in mice treated with isoproterenol. Studies on the subcellular distribution of adenylate cyclase after isoproterenol stimulation of the parotid gland showed that enzyme activity was increased in the lysosomal fraction and decreased in the cellular membrane fractions. Cytochemical studies on the localization of adenylate cyclase in stimulated gland showed an increase in vesicles which contained enzyme activity and a decrease in activity at the luminal and plasma membranes. It is suggested, based on the present findings and results reported by other investigators, that after isoproterenol stimulation of the parotid gland, adenylate cyclase (along with excess membrane) is degraded by lysosomes. If this suggestion is true, then the observed decrease in adenylate cyclase would have a molecular explanation.

Volume 27, Issue 10, pp. 1317-1321, 10/01/1979
Copyright © 1979 by The Histochemical Society


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