Bone Abstracts

Purpose: To evaluate whether calcium and vitamin D intake is associated with 25-hydroxyvitamin D (25(OH)D) and parathyroid hormone (PTH) serum concentrations or is associated with either the phalangeal dual energy X-ray absorptiometry (pDXA) or the quantitative bone ultrasound (QUS) at the phalanges and the calcaneus in independent elderly men from southwestern Spain.Methods: Serum PTH and 25(OH)D were measured in 199 healthy elderly men (mean age: 73.31...

Objective: To determine serum 25-lydroxivitamin D (25OHD) and intact parathyroid hormone (PTH) levels in an immobilized population from Northern Spain.Subjects and methods: We studied 125 immobilized people (37 men and 88 women) aged 53–101 years. (85±8 years.). Seventy-five percent of the subjects lived at home, residing in nursing homes the remaining 25%. None of them received antiresorptive therapy, corticosteroids or vitamin D supplements. ...

Objective: To analyze the effects of statins on bone mineral density (BMD), in participants from a large population-based cohort.Subjects and methods: We studied 2315 subjects (1422 women and 893 men) from the Camargo Cohort, and analyzed the differences in BMD between statin or non-statin users. We also studied the effect of the type of statin, dose, pharmacokinetic properties, and length of treatment, on BMD.Results: Four hundred...

Denosumab treatment is associated with low fracture incidence, sustained BMD increases, and reduced sCTX. The decrease in median sCTX is at the quantifiable limit (0.049 ng/ml) one month post-dose, remains low, and attenuates at the end of the 6-month dosing interval. Using 7 years of data from the FREEDOM study and its extension, we characterized changes in sCTX over time and the influencing factors. In the bone turnover marker and pharmacokinetic substudies, serum was collec...

see PP92....

Classical osteogenesis imperfecta (OI) is caused by mutations in the two genes encoding type I collagen. OI is associated with low bone mass and abnormally high bone matrix mineralization. The Brtl/+ OI mouse is a knock-in model caused by a glycine substitution in one COL1A1 allele. Brtl/+ pups display 30% perinatal lethality; survivors have small size and brittle bone. Unexpectedly, homozygous Brtl/Brtl pups, producing only mutant collagen, have normal survival rates...

Hypoparathyroidism results in low bone turnover and increased bone mineral density (BMD). Replacing deficient PTH with rhPTH(1–84) has the potential to correct these skeletal abnormalities. To investigate the effect of rhPTH(1–84) on BMD and bone turnover markers (BTMs), data from two studies were assessed.REPLACE, a double-blind, multicenter, placebo-controlled study, randomized 134 patients with hypoparathyroidism to receive once-daily rhPTH(...

Purpose: To test whether bisphosphonates for osteoporosis reduce the risk of breast cancer.Background: Observational studies and meta-analyses find that women taking bisphosphonates have about a 1/3rd reduction in risk of breast cancer as soon as 1 year of treatment. This is plausible because bisphosphonates have in vitro anti-tumor activity and high doses of zoledronate reduce recurrence in women with breast cancer. However, observational studi...

Mutations in LRP5 cause a variety of phenotypes, including high bone mass and low bone mass disorders. In patients with high bone mass, different heterozygous mutations have been described, all of them clustering in a region including the binding pocket for DKK1 and sclerostin. The pathogenic mechanism is thought to be a gain-of-function mediated by an impaired inhibition of the canonical Wnt signalling pathway, thereby leading to increased bone modelling.<p class="abstext...

see P487....