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- W2034637577 abstract "The immunoreactive forms of parathyroid hormone (iPTH) in the plasma of six patients with primary, adenomatous hyperparathyroidism and six patients with ectopic hyperparathyroidism due to non-parathyroid cancer were compared by using gel filtration on columns of Bio-Gel P-150 and radioimmunoassay of iPTH in eluted fractions after concentration. We found much less (p<0.001) small (mol wt<9,500) COOH-terminal fragments of iPTH in plasma samples from ectopic hyperparathyroid patients (0.52+/-0.13 ng eq/ml) than in samples from primary hyperparathyroid patients (3.70+/-1.15 ng eq/ml). The quantity of iPTH eluting with or before native bovine PTH [1-84] was the same in both syndromes (ectopic hyperparathyroidism, 0.82+/-0.22 ng eq/ml; primary hyperparathyroidism, 0.73+/-0.09 ng eq/ml), and these values correlated positively with plasma calcium concentration (ectopic hyperparathyroidism, r=0.908; primary hyperparathyroidism, r=0.919). In both syndromes, plasma samples had an iPTH component that eluted well before PTH [1-84] (mol wt 9,500), but this component was present in much larger quantities in three patients with ectopic hyperparathyroidism. We conclude that (a) the decreased quantity of biologically inactive COOH-terminal fragments of iPTH circulating in ectopic hyperparathyroidism accounts for the previously reported relatively lower total serum iPTH values in this syndrome as compared with primary hyperparathyroidism (Riggs et al. 1971. J. Clin. Invest. 50: 2079); (b) there appears to be sufficient iPTH with presumed biologic activity to account for the hypercalcemia in both syndromes; (c) a large PTH component, not previously recognized in plasma, is present in both ectopic and primary hyperparathyroidism and may exist as the predominant immunoreactive form of the hormone in some patients with ectopic hyperparathyroidism." @default.
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- W2034637577 date "1974-07-01" @default.
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- W2034637577 title "Immunoreactive Forms of Circulating Parathyroid Hormone in Primary and Ectopic Hyperparathyroidism" @default.
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- W2034637577 doi "https://doi.org/10.1172/jci107739" @default.
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