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A radioimmunoassay specific for the amino (N) terminal portion of the parathyroid hormone (PTH) molecule (N-PTH radioimmunoassay) has been developed by iodinating synthetic 1-34bovine PTH (1-34bPTH) and using commercially available bPTH antiserum. A radioimmunoassay specific for the carboxyl (C) terminal (C-PTH radioimmunoassay) has been carried out by adding enough amount of 1-34bPTH to the PTH radioimmunoassay system. The data obtained from N- and C-PTH radioimmunoassay were compared with those obtained from the PTH radioimmunoassay. It was observed that plasma levels of N-PTH, indicating biologically active PTH, were only one 8th to 32th to those of PTH and those of C-PTH were almost equal to those of PTH. These data corresponded well with those reported previously by using the antiserum specific for each terminal of the PTH molecule from the other laboratory. The half life of plasma N-PTH and C-PTH determined following the removal of parathyroid adenoma was less than 10 min and about 45 min respectively. These data indicate that the N-PTH radioimmunoassay can be done by iodinating 1-34bPTH and using commercially available antiserum.

Radioimmunoassay Specific for Amino (N) and Carboxyl (C) Terminal Portion of Parathyroid Hormone