Bone Abstracts

High fat diet (HFD), obesity, and physical inactivity characterize the modern lifestyle. This can lead to coronary heart diseases and type 2 diabetes mellitus. Recent studies have shown that these conditions frequently are associated with poor bone quality. However, the molecular mechanisms are poorly understood. To analyze the effect of HFD and exercise (EX) on bone homeostasis, we fed 6-week-old C57BL/6 mice a high fat (60% fat) or standard chow diet for 10 weeks (10–20...

FGF-23 is a phosphate regulating hormone and its production may be stimulated by circulating levels of 1,25-dihydroxyvitamin D (1,25-(OH)2D). Teriparatide administration increases levels of 1,25-(OH)2D, however it is unclear whether this mediates changes in FGF-23 levels. The aims were i) to determine the effect of teriparatide treatment on circulating levels of FGF-23 and 1,25-(OH)2D and ii) to describe the time course of effect in postmenopau...

Osteoporosis and vertebral fractures are recognised complications of ankylosing spondylitis (AS) but the underlying causes are incompletely understood. Osteoprotegerin (OPG) is a decoy receptor for RANK-L and inhibits osteoclastogenesis. We have previously demonstrated that antibodies to OPG (OPG-Ab) are associated with osteoporosis and increased bone turnover in patients with autoimmune diseases. The aim of this study was to determine whether OPG-Abs were detectable in AS pat...

Background and Objectives: Rheumatoid arthritis (RA) is a chronic disease characterized by severe bone destruction which has been associated with altered lipid metabolism. Apolipoprotein E (Apo E) is a lipoprotein mainly produced by macrophages. ApoE has been described as crucial in lipid metabolism but also as an important anti-inflammatory mediator regulating innate immunity and bone turnover. In the present study we investigated the role of Apo E in bone destruction during ...

Delivery of recombinant human bone morphogenetic protein (rhBMP2) with various carriers has been showing the successful induction of bone formation in many bony defects, including oral and maxillofacial regions. However, effectiveness of the exogenous proteins, when repeatedly administered into different regions in an individual, has not been determined. The present study was aimed to examine alterations of ectopic or orthotopic bone generation and serum level of anti-BMP2 ant...

Background: Three-dimensional scaffolds for the tissue regeneration are also crucial materials for bone formation. In particular, the scaffolds must provide the space for the cell migration and new bone formation. Collagen is one of the useful scaffolds to reach these performance, however, it is not always a desired biodegradability. Recently, we succeeded in developing low adhesive scaffold type I collagen (LASCol) (patent pending) which has the ability to form fibrils. In th...

Background: Collagen has biocompatibility and biodegradability with tissue or organ, therefore, collagen is the most promising material for tissue engineering. In particular, the binding of collagen to specific cells is considered an essential function to develop scaffolds. However, in some cases the binding inhibits the cell motility. In addition, it is not clear whether collagen is the effective scaffold to promote osteogenic differentiation. These days, we succeeded in deve...

Background: We previously reported that serum periostin levels are determined by additive genetic effects. Whether serum levels and/or SNPs in the periostin gene (Postn) contribute to bone microstructure however remains unknown.Aim: To investigate the association between periostin levels, Postn SNPs, bone-mass and bone microarchitecture in a cohort of postmenopausal women.Methods: A total of 648 postmenopausal women from the Geneva...

Background: Periostin is a matricellular protein involved in bone modeling and remodeling through the modulation of WNT-β catenin signaling in osteoblasts and osteocytes.Aim: To investigate the interaction between polymorphisms of six periostin SNPs and other gene polymorphism involved in periostin expression and activity on periostin serum levels and bone microarchitecture in a cohort of postmenopausal women.Methods: A total ...

High fat diet (HFD), obesity, and physical inactivity characterize the modern lifestyle. This can lead to coronary heart diseases and type 2 diabetes mellitus. Recent studies have shown that these conditions frequently are associated with poor bone quality. However, the molecular mechanisms are poorly understood. To analyze the effect of HFD and exercise (EX) on bone homeostasis, we fed 6 week-old C57BL/6 mice a high fat (60% fat) or standard chow diet for 10 weeks (10-20 mice...