Bone Abstracts

Periostin is a matricellular protein expressed in late osteoblasts/osteocytes, which levels increase in response to PTH and mechanical loading. In turn periostin contributes to modeling based bone formation while restraining bone remodeling. Periostin is also a substrate of cathepsin K and inhibition of periostin blunts the effects of cathepsin K inhibition on bone. Considering the important role of osteocytes and their cathepsin K expression on osteolysis during lactation, we...

STRUCTURE was a phase 3, open-label study evaluating the effect of romosozumab or TPTD for 12 months in women with postmenopausal osteoporosis transitioning from bisphosphonate therapy (NCT01796301). This study enrolled women with postmenopausal osteoporosis who had taken an oral bisphosphonate for ≥3 years prior to screening and alendronate in the year prior to screening; had a BMD T-score ≤−2.5 at the total hip (TH), lumbar spine (LS), or femoral neck (FN);...

Vertebral fractures (VF) defined by morphometric analysis of spine radiographs are the most common complication of osteoporosis. Those that come to medical attention, with symptoms such as back pain and kyphosis are termed clinical vertebral fractures (CVF) and account for significant morbidity and mortality. Although much progress was made in identifying loci for bone mineral density, the genetic determinants of CVF remain unclear. Here we present the initial results from a g...

RANKL induced osteoclastogenesis is mediated by several transcription factors such as NF-κB, AP-1 and Nfatc1. We have found that also cysteine proteinases are involved in the signaling pathway downstream RANK. Thus, cystatin C, Z-RLVG-CHN2 (the sequence of which is based upon one of the enzyme inhibitory domains in cystatin C) and the fungal molecule E-64 – inhibit RANKL induced mouse and human osteoclast formation in vitro (Strålberg et ...

Aims: To describe different multinucleated giant cell phenotypes and their associations with synovitis in people with rheumatoid arthritis (RA) or osteoarthritis (OA), and in an experimental model of chronic arthritis.Material and methods: A cross-sectional comparative study was performed on samples of knee synovia from age-matched patients with RA, OA, or non-arthritic post mortem (PM) controls. OA synovia were stratified by histological inflammation gr...

Introduction: Optimal vitamin D intake for lactating women remains controversial. We hypothesized that 1200 IU/day (vs 400 IU/day) of vitamin D during breastfeeding will enhance maternal vitamin D status and bone mass.Methods: Healthy mothers after term, singleton delivery were randomized to receive vitamin D3: 1200 IU/day (800+400 IU/day from multivitamins) or 400 IU/day (placebo+400 IU/day from multivitamins) during lactation. Serum 25-hydroxyvitamin D...

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Osteoporotic fractures are very common and represent an enormous unmet medical need. Our group has previously reported that addition of rTNF to the fracture site promotes fracture healing in C57/BL6 mice (Glass et al. PNAS 2011). Using a murine fracture model of endochondral healing, we observed that local addition of rTNF only accelerates fracture repair if administered within the first 24 h following injury. The optimal therapeutic dose is 1 ng. TNF is firs...

Objective: Previous study in Hong Kong reported boy-to-girl ratio of limb fracture was 5.5:1 in the adolescent group. Chinese children have increased risk for forearm fracture during puberty. This study aimed to investigate cortical growth in healthy Chinese adolescents during pubertal growth.Methods: 214 boys and 219 girls aged between 7 and 17 years old with no bone diseases were recruited. Maturity was assessed by self-reported Tanner staging. Images ...

Objective: Grip strength is a marker of muscle mass which can optimize bone strength during puberty. While previous studies have shown AIS girls had poor bone qualities and mechanical properties when compared with non-AIS girls, the correlation between bone qualities and handgrip strength in AIS remains undefined. This study aimed to investigate the correlation between handgrip strength and bone qualities including volumetric bone mineral density (vBMD), bone geometry, trabecu...