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Changes in plasma adenosine 3'5' (cAMP) and guanosine (cGMP) monophosphate, measured by specific radioimmunoassay, after 150 USP/M2 of bovine parathyroid hormone (bPTH) iv administered were studied in children with pseudohypoparathyroidism, and idiopathic hypoparathyroidism, and in normal controls. Basal concentrations of plasma cAMP (17 nmole/1 +/- 1, 6 SEM) and cGMP (8,7 nmole/1 +/- 1, 3 SEM) were the same in all studied children. Plasma cAMP in normal and idiopathic hypoparathyroid children significantly (30-fold, P less than 0.001) and constantly rose with a peak value (537 nmole/1 +/- 210 SEM) observed 5--10 min after bPTH injection. By contrast, no significant change in plasma cAMP occurred in children with pseudohypoparathyroidism. The data confirmed further the unability of pseudohypoparathyroid children to increase cAMP after exogenous PTH, while the cGMP response did not appear to be significantly modified. It is suggested that an injection of 150 USP/m2 bPTH with plasma samples for cAMP assay taken before and 10 min after hormone administration represents a simplified assessment of Ellsworth-Howard's test.

Plasma Cyclic Nucleotide Determination in the Investigation of Hypocalcemia