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PTH administration increases bone mass in rodents and in humans. PTH-related protein (PTHrP) binds to and signals via the skeletal PTH receptor. Administration of PTHrP on a once daily basis increases bone mineral content in rats. In humans, PTHrP-(1-36) is equipotent to PTH-(1-34) and is active when administered s.c. These findings suggest that PTHrP might have therapeutic benefit in the treatment of osteoporosis. In this study, 13 postmenopausal estrogen-deficient women received a single daily s.c. dose of PTHrP-(1-36) for a 14-day period to determine whether PTHrP-(1-36) 1) could be given in doses that do not alter systemic mineral homeostasis, but increase markers of bone turnover; and 2) is tolerated without adverse effects. Daily s.c. PTHrP-(1-36) administration caused no significant changes in serum calcium or phosphorus concentrations, fractional calcium excretion, the tubular maximum for phosphorus, fractional calcium excretion, or plasma 1,25-dihydroxyvitamin D concentrations. Nephrogenous cAMP and endogenous PTH-(1-84) declined. Importantly, markers of bone formation trended upward, as reported in subjects treated with PTH. In marked contrast to findings in PTH-treated subjects, in PTHrP-treated subjects, markers of bone resorption declined in a highly significant fashion. These observations indicate that PTHrP-(1-36) treatment uncouples bone formation from resorption, in favor of formation. This uncoupling, if it were to continue over the longer term, would predict that PTHrP-(1-36) might be a potent anabolic therapeutic agent for osteoporosis.

the journal of clinical endocrinology and metabolism/journal of clinical endocrinology and metabolism

Dissociation of Bone Formation from Resorption during 2-Week Treatment with Human Parathyroid Hormone-Related Peptide-(1–36) in Humans: Potential as an Anabolic Therapy for Osteoporosis<sup>1</sup>

Dissociation of Bone Formation from Resorption during 2-Week Treatment with Human Parathyroid Hormone-Related Peptide-(1–36) in Humans: Potential as an Anabolic Therapy for Osteoporosis1

Dissociation of Bone Formation from Resorption during 2-Week Treatment with Human Parathyroid Hormone-Related Peptide-(1–36) in Humans: Potential as an Anabolic Therapy for Osteoporosis¹