Conditions: Osteoporosis Humoral Hypercalcemia of Malignancy Hyperparathyroidism
Keywords: Endocrine System Diseases MusculoSkeletal System Diseases Hormones Malignancy Postmenopausal Women Bone metabolism
Allocation: NON_RANDOMIZED | Intervention model: SINGLE_GROUP
Enrollment: 14
Healthy volunteers: yes

Brief summary:
This is a dose escalation study to determine the maximum tolerable dose of Parathyroid Hormone-related Protein, PTHrP, that can be given safely over one week. The investigators plan to infuse low doses of intravenous PTHrP to determine if it leads to a sustained and progressive suppression of bone formation as occurs in humoral hypercalcemia of malignancy (HHM) or an increase in bone formation as occurs in hyperparathyroidism (HPT). Additionally, the investigators will assess the direct influence of PTHrp on markers of bone turnover, and plasma 1,25 (OH)2 vitamin D regulation in healthy human volunteers.

Detailed description:
During this research the investigators administer PTHrP to healthy young volunteers in a controlled, continuous intravenous manner. As research subjects complete the week-long study without adverse effects, the dose of PThrP will be increased in later subjects. In the event of a significant adverse effect, immediate action will be taken to reverse it. The investigators want to estimate the effect of a sustainable level of mild hypercalcemia achieved by a week-long intravenous infusion of PTHrP has on vitamin D metabolism, markers of bone turnover and fractional excretion of calcium.

Arms:
arm 1: PTHrP(1-36) at 2 picomoles/kg/hr for one week. arm 2: PTHrP(1-36) at 4 picomoles/kg/hr for one week. arm 3: PTHrP(1-36) at 5 picomoles/kg/hr for one week. arm 4: PTHrP(1-36) at 6 picomoles/kg/hr for one week.

Interventions: intervention 1: PTHrP (1-36)
Intervention descriptions: intervention 1: IND # 49,175

Protocol document: