By J.E. Treherne
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Additional info for Advances in Insect Physiology, Vol. 9
The resulting increase in positive potential described earlier (Fig. 14) is consistent with the idea that cyclic AMP stimulates a cation pump and consequently increases the apical membrane potential. Since cyclic AMP mimics the action of 5-HT on secretion (Fig. 7), chloride movement must be high enough to support the high rate of cation transport necessary for a maximal rate of secretion during the action of exogenous cyclic AMP. It is conceivable that the ability of cyclic AMP to release calcium from an intracellular pool (as postulated in Fig.
S . and Skelton, C. L. (1 97 1). Adenyl cyclase and cyclic AMP: biochemical links in the regulation of myocardial contractility. Circulation 43,437-450. Finder, A. , Boyme, T. and Schoemaker, W. C. (1 964). Relationship of hepatic potassium efflux to phosphorylase activation induced by glucagon. A m . J. Physiol. 206, 738-742. , Donald, R. A. and Butcher, R. W. (1969). Involvement of adenosine 3’,5’-monophosphate in release of ACTH. A m . J. Physiol. 217, 1287-1291. Frazier, H. S. (1971). Sodium transport in the toad bladder.
20 M . J. BERRIDGE AND W. T. PRINCE relationship operating between these two second messengers. There is some evidence that cyclic AMP can affect intracellular calcium levels by influencing the intracellular pools of calcium contained in the mitochondria or sarcoplasmic reticulum (Rasmussen, 1970; Epstein et al.. 1971). The ability of 5-HT and exogenous cyclic AMP to increase calcium efflux from salivary glands could be explained if increasing the intracellular concentration of cyclic AMP leads t o greater release of calcium from some intracellular pool.
Advances in Insect Physiology, Vol. 9 by J.E. Treherne