Bone Abstracts

Clinical data suggest that the mTOR inhibitor everolimus may have bone protective effects in addition to its anti-tumor effects in women with ER+/HER2− metastatic breast cancer receiving hormone-ablative therapies. Based on these findings, we tested the hypothesis, whether everolimus exerts concurrent anti-tumor effects while protecting the skeleton in murine models. Thus, we assessed bone metabolism and anti-tumor effects in osteolytic cancer models upon exposure to eve...

Glucocorticoids (GCs) are widely used to treat chronic inflammatory diseases such as rheumatoid (RA) and lead to multiple side effects including glucocorticoid induced osteoporosis (GIO). Our work challenges the dogma that transrepression of pro-inflammatory genes by the glucocorticoid receptor (GR) is solely responsible for reducing inflammation, whereas transactivation of genes is causing side effects.Using conditional and function selective mutant mic...

Background: Children with inflammatory bowel disease (IBD) have reduced bone mineral density (BMD). The aim of this study was to investigate whether changes in patient’s cellular immune response correlate with reductions in BMD.Method: Children undergoing lower gastrointestinal endoscopy disease were approached with an aim of recruiting 15 patients newly diagnosed with Crohn’s Disease (CD) and 15 healthy controls. Lymphocytes were isolated from...

Objective: Bone and muscle deficits are observed in patients with Crohn’s disease (CD). High-impact exercise (HIE), such as jumping based exercise, can provide hypertrophic and osteogenic stimulus, however to date there have been no studies of HIE in CD. This study aimed to assess the acceptability and feasibility of participating in HIE in adolescents and adults with CD.Methods: Two anonymous questionnaires surveyed adolescents and adults, respecti...

To further characterize the role of serotonin (5HT) in bone metabolism, Wistar-Zagreb rat model consisting of the high-5HT and low-5HT subline with different platelet 5HT content and transporter (5HTT) activity has been used.Primary osteoclasts from the high-5HT subline had an increased expression of 5HTT, 5HT–2A receptor, Trap and cathepsin K, while osteoblasts showed no difference in the expression of 5HT elements or osteoblastic markers. However,...

This paper reviews clinical reports of vitamin D deficiency rickets in neonates from 1930 onwards. In 24 reports there was good evidence of maternal deficiency. In some the diagnosis of the rickets led to the identification of symptomatic osteomalacia in the mothers; several had been severe and longstanding. Of the 15 mothers who had assays for serum 25-hydroxyvitamin D (25OHD) 13 had values <25 nmol/l (10 ng/ml) and 10 had values <12.5 nmol/l (5 ng/ml).<p class="a...

Objective: Childhood onset Crohn’s disease (CO-CD) is associated with musculoskeletal deficits. However, there are limited data regarding muscle-bone outcomes in adults with CO-CD. The current study aimed to comprehensively assess the muscle-fat-bone unit in young adults with CO-CD, using novel methods of MRI, in comparison with healthy controls.Methods: Trabecular microarchitecture and cortical geometry of the distal femur were assessed using 3T mi...

Crohn’s disease often results in abnormalities in bone strength, and ultimately increases the risk of fragility fracture. Up to 55% of patients with Crohn’s disease have bone mineral density in the osteopenia range up to 50% of osteoporosis. Glucocorticoid is frequently used in the treatment of Crohn’s disease and is associated with osteoporosis and increased fracture risk. It has been reported that osteoporotic fractures in patients with Crohn’s disease ar...

Objectives: Young male jockeys undertake calorie restriction and high volumes of physical activity during periods of musculoskeletal growth and development. Previous research shows that jockeys have compromised bone health1–4 and display disordered eating5–7. Restricted intakes of calcium and vitamin D, together with excessive amounts of exercise, increase the risk of osteoporosis in males8. The aim of this study was to establish whet...

Osteoclasts are highly specialized cell types, responsible for the resorption of bone matrix. Coordinated with osteoblasts they contribute to a proper bone turnover. An impaired or reduced function of the osteoclast leads to a pathogenic increase of the bone mass and finally osteopetrosis. Lysosomal hydrolases, as exemplied by CTSK and Acp5 (TRAP), are known to play an important role in the function of osteoclasts, and knockout mouse models of these proteins develop a bone res...