Bone Abstracts

Objectives: The Brtl mouse, a unique model for the autosomal dominant forms of osteogenesis imperfecta was used to prove the feasibility of a lentiviral-shRNA-based strategy to improve collagen quality by targeting the mutant Col1a1 allele at the point mutation responsible for the causative substitution Gly349Cys. The ability to specifically suppress the mutant allele should convert the moderate Brtl outcome to the mild one caused by quantitative defect.<p class="...

Using a CyPB-null mouse model, we previously demonstrated delayed folding, abnormal post-translational modification and altered crosslinking of type I collagen synthesized by osteoblasts. However, intracellular folding of collagen molecules was further delayed by CsA treatment of CyPB-null cells, suggesting involvement of additional PPIases in collagen folding. Since studies of CyPA functions in osteoblasts have not been reported, we investigated the role of this cytoplasmic P...

Deficiency of Cyclophilin B (CyPB) causes recessively inherited Type IX osteogenesis imperfecta, a moderately severe to lethal bone dysplasia. CyPB, encoded by PPIB, is an ER-resident peptidyl-prolyl cis-trans isomerase (PPIase) that catalyzes the rate-limiting step in collagen folding, and also functions as a component of the collagen prolyl 3-hydroxylation complex. We previously demonstrated in a Ppib−/− mouse model that CyPB PPIase activity r...

Objective: To examine the outcomes and costs of direct medical care for falls in elderly women in Lithuania.Methods: Women aged 65 years and older, who visited National Osteoporosis Center for diagnostic or treatment procedures. Thereafter a telephone survey was performed using the questionnaire with 28 questions about the number, circumstances, and consequences of falls. The cost of health care due to fall was estimated after calculating the sum of cost...

Objective: To evaluate the changes of health-related quality of life (HRQoL) 36 months after fracture in patients from Lithuania following vertebral or forearm fractures.Material and methods: Patients aged 50 years and older, with low energy trauma clinical vertebral fracture (VFx) or distal forearm fracture (FFx), enrolled and observed for 18 months in the International Costs and Utilities Related to Osteoporotic fractures Study (ICUROS) in Lithuania, w...

The present study introduces in silico analysis of osteoporotic lumbar vertebrae L1 due to dynamic compressive load.Objective: To define the reduction of load carrying capacity caused by various grades of osteoporosis.Materials and methods: The three-dimensional inhomogeneous continuum problem was formulated for simulation purposes. The L1 vertebra model consists of cortical shell, trabecular network and poste...

Objective: To investigate the relationship of frailty with vitamin D in community dwelling elderly women.Materials and methods: A retrospective cross-sectional study was performed on women over 60 years who were not using vitamin D supplementations. Frailty status was defined using Fried’s criteria: weakness, low walking speed, low physical activity, weight loss, exhaustion. Participants were classified as robust, prefrail and frail if they scored 0...

Objective: To assess the incidence and distribution of hip fractures by sex and age among individuals over 40 years in Lithuania in 2010.Materials and methods: This population-based study was performed collecting the data from all orthopaedic-traumatology inpatient departments in Lithuania. The case histories of Lithuanian residents over 40 years, who had suffered a hip fracture in 2010, were examined. Subjects with primary hip fracture (ICD-10 codes S72...

Objectives: Losartan is an angiotensin II receptor type 1 (AT1) antagonist. Losartan reduces circulating TGFb concentrations in a variety of myopathic models. We hypothesised that losartan administration to the murine osteogenesis imperfecta model OIM would result in lower circulating TGFb and CTX (bone resorption marker) and increase bone mass.Methods: All procedures were approved by UConn Health Institutional Animal Care and Use Committee and performed...

There is the question, if routine screening of hypercalcemia and hypovitaminosis D in the whole Czech population may be considered meaningful and economical.Primary hyperparathyroidism is a frequent cause of hypercalcemia. At our clinic we surgically treat 180 patients diagnosed for primary hyperparathyroidism on average per year. In the sample we detect 24% rate of ectopic gland localization. Such ectopic localization complicates effective surgery, stre...