Abstract
The occurrence of hPTH-1–37 as the native bioactive circulating form of PTH-1–84 has now been obtained using a specific purification procedure for circulating parathyroid hormone, which involves a newly developed immunoenzymetric assay for N-terminally intact hPTH. In combination with two different methods of mass spectrometry, the molecular weight of the isolated immunoreactive peptide was shown to be 4401 Da, which corresponds to hPTH-1–37. Synthetic hPTH-1–37 material was tested in the chick bioassay and produced a clear-cut increase in serum calcium concentration. We conclude that hPTH-1–37 is the native bioactive fragment of hPTH-1–84 in circulation.
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