Bone Abstracts

Recent studies confirmed the role of WNT16 in bone mineral density (BMD), bone strength and fracture risk. These findings made WNT16 interesting for further genetic and functional studies to clarify its effect on osteoporosis related parameters.A WNT16 candidate gene association study was performed in men from the Odense Androgen Study (OAS). Five tagSNPs and one multimarker test were selected for genotyping to cover most of th...

The R-spondins are a family of four small, secreted agonists of the Wnt signaling pathway. Growing evidence from both in vitro studies and in vivo models supports the major role of these proteins in the skeletal development processes. In humans, common genetic variation in the RSPO3 gene has been associated with BMD in large scale GWAS study.This study aimed at further investigation of the genetic and functional contributions of the R-s...

Introduction: Aromatase inhibitors (AI) used as adjuvant treatment of hormone-sensitive breast cancer reduce the level of circulating estrogen and cause accelerated bone loss. The aim of this study is to investigate the prevalence of osteoporosis in women with breast cancer and the effect of chemotherapy on the risk of osteoporosis.Methods: Three hundred and sixty women with hormone-sensitive breast cancer who were scheduled to start treatment with AI we...

Background: The optimal level of 25-hydroxyvitamin D2 (25(OH) D) for a healthy bone is not clear, nor the effects of treatment with vitamin D. Few previous studies have measured treatment effect on BMD in young deficient individuals.Materials and methods: A treatment group of vitamin D deficient immigrant women and a control group of ethnic Swedish women were recruited during pregnancy. A treatment of 800–1600 IU cholecalciferol and 500–1000 mg...

PTH replacement therapy in hypoparathyroidism (hypoPT) has become more accepted after proving successful in several clinical studies. Intact PTH (PTH1–84) was in 2012 withdrawn, leaving teriparatide (PTH1–34) the only therapeutic option available.All patients with postoperative HypoPT who changed medication from PTH1–84 (100 μg) to PTH1–34 (20 μg), after at least 12 months of conve...

Differentiation of osteoclast progenitor cells into mononucleated TRAcP+ pre-osteoclasts occurs in the bone marrow. But how are these cells dispatched to the future bone resorption sites? We hypothesized that the collagen type III/I-rich reticulin network of the bone marrow might provide a structural framework for localization and migration of differentiating pre-osteoclasts towards the bone surface. Therefore, adjacent sections from decalcified paraffin-embedded iliac crest b...

Objective: To investigate i) the analytic stability of PTH in venous blood specimens in serum tubes processed at different time intervals after collection compared to immediately processed blood samples collected in K2EDTA tubes, and ii) whether storage of samples in serum tubes for 5 years at −20 °C had an effect on stability of PTH.Methods: Venous blood samples were collected from ten healthy Caucasian females. One K2EDTA tube and three seru...

Introduction: The purpose of this study was to evaluate whether daily treatment with 400 IU vitamin D3 was sufficient to maintain 25-hydroxyvitamin D (25(OH)D) concentrations above 60 nmol/l over a 3-year period. In addition, the study aimed to clarify if any differences existed in serum 25(OH)D between pre-supplemented women and women who already had serum 25(OH)D above 60 nmol/l at screening.Methods: Serum samples drawn from 251 postmenopaus...

Osteoporosis is a common disorder with a partly genetic pathogenesis. Interaction between RANKL and its receptor RANK is essential in bone remodeling.We therefore investigated the effect of polymorphisms in the RANK and RANKL genes and interaction between the effects on bone mineral density (BMD) and vertebral fractures.The study was a case-control study with 462 osteoporotic patients and 336 controls. Ten polymor...

Polyphosphates (polyPs) are inorganic phosphate chains found in many cell types with higher concentrations in bone cells. As a source of inorganic phosphate (Pi) and an effective calcium reservoir due to chelation, PolyPs enable total Ca2+ and PO42− concentrations above those required for apatite saturation. Alkaline phosphatase (ALP) cleaves Pi from polyP, thus polyPs may be involved in apatite mineralization.Aim: ...