An evaluation of several biochemical markers for bone formation and resorption in a protocol utilizing cyclical parathyroid hormone and calcitonin therapy for osteoporosis

The Journal of Clinical Investigation
Anthony B HodsmanB M Steer

Abstract

Female patients (n = 20) with osteoporosis, aged 66 +/- 5 yr were studied during a 24-h infusion of parathyroid hormone (PTH [1-34]) at a rate of 0.5 IU equivalents/kg.h, and then during a 28-d period of subcutaneous injections, at a dose of 800 IU equivalents per day. Thereafter half the patients received subcutaneous injections of calcitonin, 75 U/d for 42 d, and all patients were followed to the end of a 90-d cycle. Biochemical markers of bone formation (serum alkaline phosphatase, osteocalcin, and the carboxy-terminal extension peptide of pro-collagen 1) and bone resorption (fasting urine calcium, hydroxyproline, and deoxypyridinoline) were compared during treatment by the intravenous and subcutaneous route of PTH administration, and subsequently during calcitonin therapy. During intravenous PTH infusion there were significant reductions in all three bone formation markers, despite expected rises in urinary calcium and hydroxyproline. By contrast, the circulating markers of bone formation increased rapidly by > 100% of baseline values during daily PTH injections (P < 0.001). Significant increases in bone resorption markers were only seen at the end of the 28 d of injections, but were < 100% over baseline values, (P < 0.05)....Continue Reading

Associated Clinical Trials

Sep 18, 2006·Mara Horwitz, Mara Horwitz

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