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Parathyroid hormone inhibitors: comparison of biological activity in bone- and skin-derived tissue.

ABSTRACT To evaluate the biological properties of parathyroid hormone (PTH) and two synthetic inhibitors of PTH, monolayer cell cultures derived from two human tissues were utilized. One cell culture system was prepared from human giant cell tumors of bone and the other from human neonatal foreskin. The level of cAMP was increased in cells obtained from both of these tissues when the cell cultures were incubated with PTH. The apparent affinity constants for PTH (1.2 × 108 and 1.6 × 108 M in dermal and tumor-derived cells, respectively) and the concentrations of the synthetic PTH analogs which produced 50% inhibition of PTH-induced increases in cAMP content in the two human cell cultures (5 × 108 and 8 × 108 M for the analog [Nle-8, Nle-18, Tyr-34]bovine PTH-(3-34) amide in dermal and tumor-derived cells, respectively) were nearly identical to the values previously observed in studies employing membranes prepared from canine renal tissue. Although not regarded as a PTH target tissue, fibroblasts from human...