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Modified Immunoradiometric Assay of Parathyroid Hormone-Related Protein: Clinical Application in the Differential Diagnosis of Hypercalcemia pp.532-533
Published Date 1992/6/1
DOI https://doi.org/10.11477/mf.1543901193
  • Abstract

We have developed a sensitive, specific solid-phase immunoradiometric assay (IRMA) of parathyroid hormone-related protein (PTH-RP) with use of affinity-purified polyclonal immunoglobulins. Antibodies recognizing PTH-RP (37-74) are immobilized to a polystyrene bead to “capture” analytes from the sample ; antibodies to epitopes within the 1-36 amino acid region of PTH-RP are labeled with 1251. This IRMA recognized PTH-RP (1-74) and PTH-RP (1-86) equivalently, but does not detect N-terminal or C-terminal fragments of PTH-RP, intact human parathyrin (PTH), or fragments of PTH. PTH-RP is not stable in plasma at 3-5℃ or room temperature, buta mixture of aprotinin (500 kallikrein units/L) and leupeptin (2.5 mg/L) improves PTH-RP stability in blood samples. In plasma collectedin the presence of these protease inhibitors from normal volunteersand patients with various disorders of calcium metabolism, PTH-RPconcentrations were above normal (>1.5 pmol/L) in 91% (42 of 46)of patients with hypercalcemia associated with nonhematologicalmalignancy. In plasma from patients with other hypercalcemic conditions (e. g., primary hyperparathyroidism, sarcoidosis, and vitamin Dexcess), PTH-RP was undetectable.


Copyright © 1992, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1375 印刷版ISSN 0301-2611 医学書院

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