Bone Abstracts

Bone metastasis is a frequent occurrence in cancer patients, with severe complications such as fracture, bone pain, and hypercalcemia. The pathogenesis of osteolyitc bone metastasis depends on cross-communications between tumor cells and various stromal cells residing in the bone microenvironment. Many of these interactions are mediated by tumor derived growth factors, cytokines, proteases, and other secreted and exosomal proteins. Using gene expression profiling and proteomic...

Giant cell tumour of bone (GCTb) is an osteolytic neoplasia with tendency to local recurrence (10–25%), while metastases or malignant transformation are described in 1–4% of cases.It is composed by three distinct populations that cross-talk each other generating unbalance in bone remodeling and activation of NF-kB signaling pathway.To identify new candidate biological markers useful for improving clinical management of GC...

Periostin (osteoblast-specific factor OSF-2) is a glycoprotein that in humans is encoded by the POSTN gene. It is a component of the extracellular matrix and is thought to be involved in osteoblast recruitment, attachment and spreading.The N-terminus part of periostin is conserved, while the C-terminal region gives rise to different splice isoforms upon alternative splicing. The isoforms have a molecular weight range from 83 to 93 kDa.<p class="abste...

Notch signaling plays a central role in various cell fate decisions, including skeletal development. Recently, Notch signaling was implicated in osteoclast differentiation and maturation, including the resorption activity of osteoclasts. However, the specific involvement of notch signaling in resorption activity was not fully investigated. Here, we investigated the roles of Notch signaling in the resorption activity of osteoclasts by use of the γ-secretase inhibitor diben...

Tannerella forsythia is a gram-negative, anaerobic, asaccharolytic, fusiform bacterium. The presence of the bacterium is associated with various forms of periodontal disease, including gingivitis, chronic and aggressive periodontitis. The expression of GroEL, a bacterial heat shock protein, increases in stressful conditions such as infection. GroEL is a moonlighting protein that has multiple functions. The aim of this study was to evaluate the effect of T. forsyth...

Osteoclasts are bone-resorbing multinucleated cells that differentiate from monocyte/macrophage-lineage precursors. Bone destruction and osteoporosis are attributed to excessively activated osteoclasts. Osteoclast differentiation is governed by diverse regulatory processes including nuclear factor-activated T cells c1 (NFATc1) activation in response to RANKL. The mechanism of epigenetic regulation of NFATc1 in osteoclastogenesis not investigated yet. Here we test a hypothesis ...

Pseudovitamin D-deficiency rickets (PDDR) is a rare autosomal recessive disorder resulting from a defect in renal 25-hydroxyvitamin D 1α-hydroxylase, which is encoded by the CYP27B1 gene. To our best knowledge, 48 mutations of the CYP27B1 gene have been identified so far. In the present study, we investigated CYP27B1 mutations in seven individuals from six separate families and identified nine different mutations: two novel missense mutations (G194R, R259L), three novel a...

Histomorphometry is often adopted as a methodological approach in research of femoral bone structure. However, it is common do not describe technical details of procedure especially on the steps of macroscopy, paraffin embedding and microtomy. So we propose a simplified, reliable and reproducible method of histological processing for intertrochanteric region and femoral neck of mice, to ensure the achievement of tissue sections with similar structures, cell populations and his...

Arterial calcification is now considered as an actively regulated process resembling osteogenesis orchestrated by a number of systemic or constitutively expressed mediators. Genetic studies of rare inherited syndromes have identified key regulators of arterial calcification. Based on the pathogenic principles causing the diseases these can be classified into three groups:i) Disorders of an increased extracellular inorganic phosphate/inorganic pyrophospha...

Introduction: The evidence for the effectiveness of early rehabilitation of patients with rheumatoid arthritis (RA) is scanty. The aim of the study is to evaluate the efficiency of rehabilitation program for patients with early RA.Methods: 34 study group patients with early RA underwent 6-month rehabilitation (hospital stage: 15-min local air cryotherapy (−;60 °C, Criojet Air C600) for hand, knee or ankle joints, 45-min therapeutic exercises u...