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By J.E. Treherne

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1 969). The effect of polypeptide hormones on lipid monolayers. 11. The effect of insulin anFlYgues, vasopressin, oxytocin, thyrocalcitonin, adrenocorticotropin and 3 ,5 -cvclic AMP on the uptake of Ca2+ by monomolecular films of monooctadecyl phosphate. Biochim. biophys. A c t a 193, 117-123. Kakiuchi, S . and Rall, T. W. (1 968a); The influence of chemical agents on the accumulation of adenosine 3 ’ 3 -phosphate in slices of rabbit cerebellum. Molec. Pharmac. 4, 367-378. Kakiuchi, S. and Rall, T.

Recently it has been postulated that calcium may have an equally important role in mediating hormone action (Rasmussen, 1970). This idea is particularly appealing because intracellular ions are known to play an important role in regulating many cellular functions (Bygrave, 1967). These studies on salivary glands suggest a model of hormone action which may be applicable to other hormones. The primary hormonal message arriving at the salivary gland cell is carried in the chemical configuration of the 5-HT molecule.

A. The transepithelial potential (VT ) recorded by means of calomel electrodes connected to the two outer baths. b. The potential across the basal surface (V,,), recorded by means of a microelectrode with the perfusion bath calomel electrode as a reference (note that the recording across this surface is greatly amplified). c. The potential across the apical surface (V,) recorded by using the calomel electrode in the saliva bath as a reference. The potential change across this surface is very similar to the change in transepithelial potential.

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