Markers of bone remodeling in the elderly subject: effects of vitamin D insufficiency and its correction

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
M BrazierJ L Sebert

Abstract

The elderly subject is prone to both vitamin B insufficiency and calcium insufficiency due to a low calcium intake and calcium malabsorption. These two alterations may lead to secondary hyperparathyroidism, and thus to increased bone loss. We investigated 72 elderly subjects (16 men and 56 women) with vitamin D insufficiency and 25 healthy elderly women with normal vitamin D status, with respect to their indices of calcium metabolism and of bone remodeling: serum total alkaline phosphates (phosphatases), bone AP (BAP), osteocalcin (BGP), tartrate-resistant acid phosphatase (TRAP), urine hydroxyproline (HYP), and the 3-OH-pyridinium derivatives pyridinoline (PYD) and deoxypyridinoline (DPD), which are new markers of bone resorption. We then studied the modifications of these markers in the patients with vitamin D insufficiency at 3 months and 6 months after onset of a daily vitamin D and calcium supplementation. When compared with elderly subjects with normal vitamin D status, patients with vitamin D insufficiency had increased intact parathyroid hormone (iPTH) levels (60.1 +/- 10.2 vs 30.2 +/- 4.5, p < 0.001) and a high bone turnover as reflected by increased values of most serum and urine markers of bone remodeling. PYD and DP...Continue Reading

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