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  • Title: Do cyclic AMP concentrations in saliva reflect PTH biologic activity?
    Author: Kraiem Z, Shasha SM, Ben-Aryeh H, Glaser B, Sheinfeld M, Cristal B, Chirurg C.
    Journal: Metabolism; 1985 Jun; 34(6):505-8. PubMed ID: 2987641.
    Abstract:
    The aim of this study was to investigate whether the concentration of cAMP in saliva might reflect the biologic activity of parathyroid hormone (PTH), as nephrogenous levels of cAMP reflect parathyroid function. Patients with primary hyperparathyroidism (HPT) with elevated levels of PTH, nephrogenous cAMP, and serum calcium were found to have cAMP levels not significantly different from control subjects. When the levels of these parameters were reduced following parathyroidectomy, salivary cAMP concentrations were not affected. Similarly, an oral calcium loading test (which decreased both PTH and nephrogenous cAMP in normal subjects) failed to influence salivary cAMP levels. Basal salivary cAMP concentrations were low in secondary hyperparathyroid patients due to chronic renal failure and rose almost fivefold following dialysis despite the stable plasma cAMP levels and salivary flow rate. We conclude that salivary cAMP concentrations do not appear to be influenced by changes in circulating biologically active PTH. However, salivary cAMP concentrations do change in response to certain perturbations; this suggests that they are regulated by some other modulator(s).
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