An acute intake of phosphate increases parathyroid hormone secretion and inhibits bone formation in young women

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
Merja U M Kärkkäinen, Christel J E Lamberg-Allardt

Abstract

We studied the effects of a single oral phosphate (Pi) dose as well as those of three consecutive oral phosphate doses on calcium and bone metabolism. In the first part of the study (P1 study) 10 female volunteers were given orally 1500 mg of Pi in water, as a single dose, or plain water in randomized order at two different sessions. In the second part of the study (P3 study), 10 female volunteers were given orally 1500 mg of Pi, as three separate 500 mg doses in water, or plain water in randomized order. Calcium and bone metabolism was monitored for 24 h by measuring the concentrations of serum ionized calcium (S-iCa), urinary calcium, serum phosphate (S-P), urinary P, serum intact parathyroid hormone (PTH), serum carboxy-terminal propeptide of type I collagen (PICP), serum osteocalcin (BGP), serum carboxy-terminal telopeptide of type I collagen (ICTP), urine deoxypyridinoline (DPD) and bone-specific alkaline phosphatase activity (B-ALP). The S-P increased (p = 0.00005 and p = 0.0005, in the P1 and P3 studies, respectively), the S-iCa concentration declined significantly only in the P1 study (p = 0.0014), the urinary calcium excretion decreased (p = 0.02 and 0.013, in the P1 and P3 studies, respectively), and the PTH concentra...Continue Reading

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