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The effect of synthetic 1-34 fragment of human parathyroid hormone (hPTH(1-34] on plasma adenosine 3',5'-monophosphate (cAMP) in human subjects and the diagnostic criteria for the plasma cAMP response in an Ellsworth-Howard test were studied. 20 or 30 micrograms hPTH(1-34) and 200 USP Parathormone (Eli Lilly &amp; Co.), infused intravenously over 5 min, produced very similar patterns of response in plasma cAMP, peak values being observed within 5 or 10 min after the end of the infusion. The maximum levels of plasma cAMP were over 111.5 pmol/ml in all of the normal subjects (n = 5) and patients with idiopathic hypoparathyroidism (n = 22), including those of children, but the plasma cAMP did not rise above 65.0 pmol/ml in pseudohypoparathyroidism (n = 7). There existed a significant correlation between the maximum plasma cAMP concentrations and increases in urinary cAMP excretion after infusions of both hPTH(1-34) and Parathormone. These results suggest that hPTH(1-34) has effects essentially identical to those of native PTH on plasma cAMP. We would like to propose a new diagnostic criterion in the Ellsworth-Howard test: a peak value of plasma cAMP over 100 pmol/ml after 30 micrograms hPTH(1-34) infusion is regarded as a normal response.

endocrinologia japonica

Effect of synthetic 1-34 fragment of human parathyroid hormone on plasma adenosine 3',5'-monophosphate (cAMP) concentrations and the diagnostic criteria based on the plasma cAMP response in ellsworth-howard test.