Bone Abstracts

Objectives: The aim of this study was to evaluate the association between the age at onset of walking and bone mineral content (BMC) in healthy 2-year-old children participating in the Vitamin D in Infants Trial (VIDI).Methods: Altogether 253 children (120 girls, 133 boys) with a daily vitamin D3 intake of 10 μg and a sufficient serum 25-hydroxyvitamin D (25-OHD) concentration (>50 nmol/l) were included in the analysis. BMC was measur...

Objectives: The regulation of fibroblast growth factor 23 (FGF23) metabolism during infancy is inadequately characterized. We previously observed a distinct sex difference in intact FGF23 at 3 months of age. In this study we aimed to further examine the role of sex and iron status in FGF23 metabolism in 1-year-old children.Methods: This was a cross-sectional study including 731 1-year-old Caucasian children participating the Vitamin D intervention in inf...

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...

Osteogenesis imperfecta (OI) is a hereditary disease with a generalized involvement of the connective tissue caused by collagen type 1 mutations. The clinical appearance is broad with fractures as the key symptom. Only few genotype–phenotype correlations have been established. We aim to characterize the Danish OI population thoroughly including DXA and HRpQCT, anthropometry, patient history, and genetic background.This cross-sectional study includes...

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...

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It is well established that estrogen, mainly via estrogen receptor alpha (ERα), has positive effects on bone, but estrogen is not considered as a treatment option against osteoporosis due to negative side-effects in other tissues. ERα is widely subjected to posttranslational modifications (PTMs), which can affect cellular responses to estrogen in a tissue specific manner by influencing the function of ERα and its interactions with other proteins. The in vivo...

Osteoclast (OC)-mediated bone destruction is a key feature of rheumatoid arthritis (RA). In RA synovial tissue a reduced density of catecholaminergic nerve fibres has been observed. Studies on sweat gland innervation proved that catecholaminergic fibres have the ability to undergo a phenotypic transition to cholinergic nerves. The sympathetic neurotransmitters norepinephrine (NE), acetylcholine (ACh), and vasoactive intestinal peptide (VIP) affect osteoclastogenesis oppositely...

Background/aims: Glucocorticoid treatment may influence bone and muscle development in patients with congenital adrenal hyperplasia (CAH). This study evaluates bone mineral density (BMD), bone geometry and muscle mass longitudinally throughout childhood.Methods: Eighteen patients (ten males, eight females) with classical CAH were included. BMD, bone geometry and muscle mass were measured using peripheral quantitative computed tomography (pQCT) in prepube...

Background: Disturbance of systemic phosphate homeostasis is often associated with musculoskeletal dysfunction. Multiple factors related to the underlying condition such as calcium levels and endocrine mechanisms are thought to contribute. Distinct effects of inorganic phosphate itself as well as its main regulator FGF23 by activation of similar pathways have been shown in several cell types. We are not aware of any detailed investigations into their effect on the differentiat...